Bio

Bio


Dauskardt and his group have worked extensively on integrating new materials into emerging technologies including thin-film structures for nanoscience and energy technologies, high-performance composite and laminates for aerospace, and on biomaterials and soft tissues in bioengineering. His group has pioneered methods for characterizing adhesion and cohesion of thin films used extensively in device technologies. His research on wound healing has concentrated on establishing a biomechanics framework to quantify the mechanical stresses and biologic responses in healing wounds and define how the mechanical environment affects scar formation. Experimental studies are complimented with a range of multiscale computational capabilities. His research includes interaction with researchers nationally and internationally in academia, industry, and clinical practice.

Academic Appointments


Honors & Awards


  • Outstanding Scientific Accomplishment Award in Ceramics and Metallurgy, U.S. Department of Energy (1989)
  • Dana Adams Griffin Award, Stanford University (1994)
  • Alexander von Humboldt Research Award, Alexander von Humboldt Foundation (2002)
  • International Silver Medal, ASM (2003)
  • Faculty Award, IBM (2006)
  • Distinguished Speaker, Department of Materials Science and Engineering, Penn State (2006)
  • Thin Film User Group Special Award, American Vacuum Society (2008)
  • Multilevel Interconnection (VMIC) International Conference Award, VLSI/ULSI (2008)
  • Elected Fellow, American Ceramics Society (2008)
  • Elected Fellow, ASM International (2010)
  • Structural Materials Distinguished Scientist/Engineer Award, The Metallurgical Society (2010)
  • University Researcher Award, Semiconductor Industry Association (2010)
  • Shared University Research Award, IBM (2011)
  • Henry Maso Award, The International Federation of Societies of Cosmetic Chemists (2011)

Professional Education


  • PhD, UC Berkeley/Witwatersrand (1988)

Teaching

2014-15 Courses


Publications

All Publications


  • Entanglements in P3HT and their influence on thin-film mechanical properties: Insights from molecular dynamics simulations JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS Tummala, N. R., Risko, C., Bruner, C., Dauskardt, R. H., Bredas, J. 2015; 53 (13): 934-942

    View details for DOI 10.1002/polb.23722

    View details for Web of Science ID 000354821300006

  • Molecular-Scale Understanding of Cohesion and Fracture in P3HT:Fullerene Blends ACS APPLIED MATERIALS & INTERFACES Tummala, N. R., Bruner, C., Risko, C., Bredas, J., Dauskardt, R. H. 2015; 7 (18): 9957-9964

    Abstract

    Quantifying cohesion and understanding fracture phenomena in thin-film electronic devices are necessary for improved materials design and processing criteria. For organic photovoltaics (OPVs), the cohesion of the photoactive layer portends its mechanical flexibility, reliability, and lifetime. Here, the molecular mechanism for the initiation of cohesive failure in bulk heterojunction (BHJ) OPV active layers derived from the semiconducting polymer poly(3-hexylthiophene) [P3HT] and two monosubstituted fullerenes is examined experimentally and through molecular-dynamics simulations. The results detail how, under identical conditions, cohesion significantly changes due to minor variations in the fullerene adduct functionality, an important materials consideration that needs to be taken into account across fields where soluble fullerene derivatives are used.

    View details for DOI 10.1021/acsami.5b02202

    View details for Web of Science ID 000354906500074

    View details for PubMedID 25895745

  • Molecular Design for Moisture Insensitivity of Compositionally Graded Hybrid Films ACS APPLIED MATERIALS & INTERFACES Giachino, M., Dubois, G., Dauskardt, R. H. 2015; 7 (12): 6812-6818

    Abstract

    Effective bonding of organic/inorganic interfaces especially in high humidity environments is paramount to the structural reliability of modern multilayer device technologies, such as flexible electronics, photovoltaics, microelectronic devices, and fiber-metal laminates used in aerospace applications. We demonstrate the ability to design compositionally graded hybrid organic/inorganic films with an inorganic zirconium network capable of forming a moisture-insensitive bond at the interface between an oxide and organic material. By controlling the chemistry of the deposited films and utilizing time-dependent debonding studies, we were able to correlate the behavior of the hybrid films at high humidity to their underlying molecular structure. As a result, an outstanding threefold improvement in adhesion of silicon/epoxy interfaces can be obtained with the introduction of these films even in high humidity environments.

    View details for DOI 10.1021/acsami.5b00344

    View details for Web of Science ID 000352246700054

    View details for PubMedID 25751764

  • A catalytic alloy approach for graphene on epitaxial SiC on silicon wafers JOURNAL OF MATERIALS RESEARCH Iacopi, F., Mishra, N., Cunning, B. V., Goding, D., Dimitrijev, S., Brock, R., Dauskardt, R. H., Wood, B., Boeckl, J. 2015; 30 (5): 609-616

    View details for DOI 10.1557/jmr.2015.3

    View details for Web of Science ID 000351444200002

  • The relationship between water loss, mechanical stress, and molecular structure of human stratum corneum ex vivo JOURNAL OF BIOPHOTONICS Vyumvuhore, R., Tfayli, A., Biniek, K., Duplan, H., Delalleau, A., Manfait, M., Dauskardt, R., Baillet-Guffroy, A. 2015; 8 (3): 217-225

    Abstract

    Proper hydration of the stratum corneum (SC) is important for maintaining skin's vital functions. Water loss causes development of drying stresses, which can be perceived as 'tightness', and plays an important role in dry skin damage processes. However, molecular structure modifications arising from water loss and the subsequent development of stress has not been established. We investigated the drying stress mechanism by studying, ex vivo, the behaviors of the SC components during water desorption from initially fully hydrated samples using Raman spectroscopy. Simultaneously, we measure the SC mechanical stress with a substrate curvature instrument. Very good correlations of water loss to the mechanical stress of the stratum corneum were obtained, and the latter was found to depend mainly on the unbound water fraction. In addition to that, the water loss is accompanied with an increase of lipids matrix compactness characterized by lower chain freedom, while protein structure showed an increase in amount of α-helices, a decline in α-sheets, and an increase in folding in the tertiary structure of keratin. The drying process of SC involves a complex interplay of water binding, molecular modifications, and mechanical stress. This article provides a better understanding of the molecular mechanism associated to SC mechanics.

    View details for DOI 10.1002/jbio.201300169

    View details for Web of Science ID 000350452700004

    View details for PubMedID 24446389

  • Morphology and interdiffusion control to improve adhesion and cohesion properties in inverted polymer solar cells SOLAR ENERGY MATERIALS AND SOLAR CELLS Dupont, S. R., Voroshazi, E., Nordlund, D., Dauskardt, R. H. 2015; 132: 443-449
  • Decohesion Kinetics in Polymer Organic Solar Cells ACS APPLIED MATERIALS & INTERFACES Bruner, C., Novoa, F., Dupont, S., Dauskardt, R. 2014; 6 (23): 21474-21483

    Abstract

    We investigate the role of molecular weight (MW) of the photoactive polymer poly(3-hexylthiophene) (P3HT) on the temperature-dependent decohesion kinetics of bulk heterojunction (BHJ) organic solar cells (OSCs). The MW of P3HT has been directly correlated to its carrier field effect mobilities and the ambient temperature also affects OSC in-service performance and P3HT arrangement within the BHJ layer. Under inert conditions, time-dependent decohesion readily occurs within the BHJ layer at loads well below its fracture resistance. We observe that by increasing the MW of P3HT, greater resistance to decohesion is achieved. However, failure consistently occurs within the BHJ layer representing the weakest layer within the device stack. Additionally, it was found that at temperatures below the glass transition temperature (∼41-45 °C), decohesion was characterized by brittle failure via molecular bond rupture. Above the glass transition temperature, decohesion growth occurred by a viscoelastic process in the BHJ layer, leading to a significant degree of viscoelastic deformation. We develop a viscoelastic model based on molecular relaxation to describe the resulting behavior. The study has implications for OSC long-term reliability and device performance, which are important for OSC production and implementation.

    View details for DOI 10.1021/am506482q

    View details for Web of Science ID 000346326600107

    View details for PubMedID 25369109

  • Loss of Keratinocyte Focal Adhesion Kinase Stimulates Dermal Proteolysis Through Upregulation of MMP9 in Wound Healing ANNALS OF SURGERY Wong, V. W., Garg, R. K., Sorkin, M., Rustad, K. C., Akaishi, S., Levi, K., Nelson, E. R., Tran, M., Rennert, R., Liu, W., Longaker, M. T., Dauskardt, R. H., Gurtner, G. C. 2014; 260 (6): 1138-1146
  • Controlling Interdiffusion, Interfacial Composition, and Adhesion in Polymer Solar Cells ADVANCED MATERIALS INTERFACES Dupont, S. R., Voroshazi, E., Nordlund, D., Vandewal, K., Dauskardt, R. H. 2014; 1 (7)
  • Highly Transparent Multifunctional Bilayer Coatings on Polymers Using Low-Temperature Atmospheric Plasma Deposition ACS NANO Cui, L., Lionti, K., Ranade, A., Larson-Smith, K., Dubois, G. J., Dauskardt, R. H. 2014; 8 (7): 7186-7191

    Abstract

    We report on the synthesis of hard, adhesive, and highly transparent bilayer organosilicate thin films on large poly(methyl methacrylate) substrates by atmospheric plasma, in ambient air, at room temperature, in a one-step process, using a single precursor. The method overcomes the challenge of fabricating coatings with high mechanical and interfacial properties in a one-step process. The bottom layer is a carbon-bridged hybrid silica with excellent adhesion with the poly(methyl methacrylate) substrate, and the top layer is a dense silica with high Young’s modulus, hardness, and scratch resistance. The bilayer structure exhibited ~100% transmittance in the visible wavelength range, twice the adhesion energy and three times the Young’s modulus of commercial polysiloxane sol–gel coatings.

    View details for DOI 10.1021/nn502161p

    View details for Web of Science ID 000339463100075

    View details for PubMedID 24987933

  • Conductive Transparent TiNx/TiO2 Hybrid Films Deposited on Plastics in Air Using Atmospheric Plasma Processing ADVANCED FUNCTIONAL MATERIALS Dong, S., Watanabe, M., Dauskardt, R. H. 2014; 24 (20): 3075-3081
  • Atmospheric plasma deposition of transparent semiconducting ZnO films on plastics in ambient air ORGANIC ELECTRONICS Watanabe, M., Cui, L., Dauskardt, R. H. 2014; 15 (3): 775-784
  • Abstract 33: Stress Offloading through Mechanomodulation is Associated with Down-Regulation of Inflammatory Pathways in a Large Animal Model. Plastic and reconstructive surgery Januszyk, M., Wong, V. W., Bhatt, K., Vial, I. N., Dauskardt, R., Longaker, M. T., Gurtner, G. C. 2014; 133 (3): 44-?

    View details for DOI 10.1097/01.prs.0000445066.09978.3b

    View details for PubMedID 25942144

  • Decohesion Kinetics of PEDOT: PSS Conducting Polymer Films ADVANCED FUNCTIONAL MATERIALS Dupont, S. R., Novoa, F., Voroshazi, E., Dauskardt, R. H. 2014; 24 (9): 1325-1332
  • Role of Molecular Weight on the Mechanical Device Properties of Organic Polymer Solar Cells MACROMOLECULES Bruner, C., Dauskardt, R. 2014; 47 (3): 1117-1121

    View details for DOI 10.1021/ma402215j

    View details for Web of Science ID 000331344200029

  • Toughening Thin-Film Structures with Ceramic-Like Amorphous Silicon Carbide Films SMALL Matsuda, Y., Ryu, I., King, S. W., Bielefeld, J., Dauskardt, R. H. 2014; 10 (2): 253-257

    Abstract

    A significant improvement of adhesion in thin-film structures is demonstrated using embedded ceramic-like amorphous silicon carbide films (a-SiC:H films). a-SiC:H films exhibit plasticity at the nanoscale and outstanding chemical and thermal stability unlike most materials. The multi-functionality and the ease of processing of the films have potential to offer a new toughening strategy for reliability of nanoscale device structures.

    View details for Web of Science ID 000331112100004

    View details for PubMedID 23894055

  • Environmental mechanisms of debonding in photovoltaic backsheets SOLAR ENERGY MATERIALS AND SOLAR CELLS Novoa, F. D., Miller, D. C., Dauskardt, R. H. 2014; 120: 87-93
  • An ultra-sensitive resistive pressure sensor based on hollow-sphere microstructure induced elasticity in conducting polymer film NATURE COMMUNICATIONS Pan, L., Chortos, A., Yu, G., Wang, Y., Isaacson, S., Allen, R., Shi, Y., Dauskardt, R., Bao, Z. 2014; 5

    View details for DOI 10.1038/ncomms4002

    View details for Web of Science ID 000331082900001

  • Hybrid coupling layers for bulk metallic glass adhesion JOURNAL OF MATERIALS RESEARCH Yang, J., Dauskardt, R. H. 2013; 28 (22): 3164-3169
  • Independent Control of Adhesive and Bulk Properties of Hybrid Silica Coatings on Polycarbonate ACS APPLIED MATERIALS & INTERFACES Lionti, K., Cui, L., Volksen, W., Dauskardt, R., Dubois, G., Toury, B. 2013; 5 (21): 11276-11280

    Abstract

    Transparent polymers are widely used in many applications ranging from automotive windows to microelectronics packaging. However, their intrinsic characteristics, in particular their mechanical properties, are significantly degraded with exposure to different weather conditions. For instance, under humid environment or UV-irradiation, polycarbonate (PC) undergoes depolymerization, leading to the release of Bisphenol A, a molecule presumed to be a hormonal disruptor, potentially causing health problems. This is a serious concern and the new REACH (Registration, Evaluation, Authorization and Restriction of Chemical substances ) program dictates that materials releasing Bisphenol A should be removed from the market by January 1st, 2015 (2012-1442 law). Manufacturers have tried to satisfy this new regulation by depositing atop the PC a dense oxide-like protective coating that would act as a barrier layer. While high hardness, modulus, and density can be achieved by this approach, these coatings suffer from poor adhesion to the PC as evidenced by the numerous delamination events occurring under low scratch constraints. Here, we show that the combination of a N2/H2-plasma treatment of PC before depositing a hybrid organic-inorganic solution leads to a coating displaying elevated hardness, modulus, and density, along with a very high adherence to PC (> 20 J/m(2) as measured by double cantilever beam test). In this study, the sol-gel coatings were composed of hybrid O/I silica (based on organoalkoxysilanes and colloidal silica) and designed to favor covalent bonding between the hybrid network and the surface treated PC, hence increasing the contribution of the plastic deformation from the substrate. Interestingly, double-cantilever beam (DCB) tests showed that the coating's adhesion to PC was the same irrespective of the organoalkoxysilanes/colloidal silica ratio. The versatility of the sol-gel deposition techniques (dip-coating, spray-coating, etc.), together with the excellent mechanical properties and exceptional adherence of this hybrid material to PC should lead to interesting new applications in diverse fields: optical eye-glasses, medical materials, packaging, and so forth.

    View details for DOI 10.1021/am403506k

    View details for Web of Science ID 000327103500114

    View details for PubMedID 24090249

  • Influence of network bond percolation on the thermal, mechanical, electrical and optical properties of high and low-k a-SiC:H thin films JOURNAL OF NON-CRYSTALLINE SOLIDS King, S. W., Bielefeld, J., Xu, G., Lanford, W. A., Matsuda, Y., Dauskardt, R. H., Kim, N., Hondongwa, D., Olasov, L., Daly, B., Stan, G., Liu, M., Dutta, D., Gidley, D. 2013; 379: 67-79
  • Heterogeneous solution deposition of high-performance adhesive hybrid films. ACS applied materials & interfaces Giachino, M., Dubois, G., Dauskardt, R. H. 2013; 5 (20): 9891-9895

    Abstract

    Interfaces between organic and inorganic materials are of critical importance to the lifetime of devices found in microelectronic chips, organic electronics, photovoltaics, and high-performance laminates. Hybrid organic/inorganic materials synthesized through sol-gel processing are best suited to address these challenges because of the intimate mixing of both components. We demonstrate that deposition from heterogeneous sol-gel solutions leads to the unique nanolength-scale control of the through-thickness film composition and therefore the independent optimization of both the bulk and interfacial film properties. Consequently, an outstanding 3-fold improvement in the adhesive/cohesive properties of these hybrid films can be obtained from otherwise identical precursors.

    View details for DOI 10.1021/am403032v

    View details for PubMedID 24088533

  • Evidence of a highly compressed nanolayer at the epitaxial silicon carbide interface with silicon ACTA MATERIALIA Iacopi, F., Brock, R. E., Iacopi, A., Hold, L., Dauskardt, R. H. 2013; 61 (17): 6533-6540
  • Improved adhesion of dense silica coatings on polymers by atmospheric plasma pretreatment. ACS applied materials & interfaces Cui, L., Ranade, A. N., Matos, M. A., Dubois, G., Dauskardt, R. H. 2013; 5 (17): 8495-8504

    Abstract

    Oxygen atmospheric plasma was used to pretreat polycarbonate (PC) and stretched poly(methyl methacrylate) (PMMA) surfaces in order to enhance the adhesion of the dense silica coatings deposited by atmospheric plasma on the polymer substrates. The treatment time and chemical structure of the polymers were found to be important factors. For PC, a short treatment increased the adhesion energy, while longer treatment times decreased the adhesion. In contrast, plasma pretreatment monotonically decreased the adhesion of PMMA, and pristine PMMA exhibited much higher adhesion than the PC counterpart. We found that adhesion enhancement was achieved through improved chemical bonding, chain interdiffusion, and mechanical interlocking at the coating/substrate interface, after a short atmospheric plasma treatment. Decreased adhesion resulted from overoxidation and low-molecular-weight weak layer formation on the polymer surface by prolonged atmospheric plasma treatment. The dramatic differences in the behavior of PC and PMMA in relation to the plasma treatment time were due to their dissimilar resistance to atmospheric plasma exposure.

    View details for DOI 10.1021/am401921k

    View details for PubMedID 23942343

  • Tunable plasticity in amorphous silicon carbide films. ACS applied materials & interfaces Matsuda, Y., Kim, N., King, S. W., Bielefeld, J., Stebbins, J. F., Dauskardt, R. H. 2013; 5 (16): 7950-7955

    Abstract

    Plasticity plays a crucial role in the mechanical behavior of engineering materials. For instance, energy dissipation during plastic deformation is vital to the sufficient fracture resistance of engineering materials. Thus, the lack of plasticity in brittle hybrid organic-inorganic glasses (hybrid glasses) often results in a low fracture resistance and has been a significant challenge for their integration and applications. Here, we demonstrate that hydrogenated amorphous silicon carbide films, a class of hybrid glasses, can exhibit a plasticity that is even tunable by controlling their molecular structure and thereby leads to an increased and adjustable fracture resistance in the films. We decouple the plasticity contribution from the fracture resistance of the films by estimating the "work-of-fracture" using a mean-field approach, which provides some insight into a potential connection between the onset of plasticity in the films and the well-known rigidity percolation threshold.

    View details for DOI 10.1021/am402046e

    View details for PubMedID 23876200

  • Molecular Intercalation and Cohesion of Organic Bulk Heterojunction Photovoltaic Devices ADVANCED FUNCTIONAL MATERIALS Bruner, C., Miller, N. C., McGehee, M. D., Dauskardt, R. H. 2013; 23 (22): 2863-2871
  • Adhesion properties of inverted polymer solarcells: Processing and film structure parameters ORGANIC ELECTRONICS Dupont, S. R., Voroshazi, E., Heremans, P., Dauskardt, R. H. 2013; 14 (5): 1262-1270
  • Tailored amorphous silicon carbide barrier dielectrics by nitrogen and oxygen doping THIN SOLID FILMS Matsuda, Y., King, S. W., Dauskardt, R. H. 2013; 531: 552-558
  • Moisture-assisted cracking and atomistic crack path meandering in oxidized hydrogenated amorphous silicon carbide films JOURNAL OF APPLIED PHYSICS Matsuda, Y., King, S. W., Oliver, M., Dauskardt, R. H. 2013; 113 (8)

    View details for DOI 10.1063/1.4792212

    View details for Web of Science ID 000315667500032

  • Tailored Amorphous Silicon Carbide Barrier Dielectrics by Nitrogen and Oxygen Doping Thin Solid Films Matsuda, Y., King, Sean, W., Dauskardt, Reinhold, H. 2013; 531: 552 – 558
  • Evidence of a highly compressed nano-layer at the epitaxial silicon carbide interface with silicon Acta Materialia Iacopi, F., Brock, R. E., Iacopi, A. V., Hold, L., Dauskardt, R. H. 2013; 61: 6533–6540
  • Can understanding the effect of solar UV radiation on skin’s biomechanical function help prevent skin damage? Expert Review of Dermatology Biniek, K., Dauskardt, Reinhold, H. 2013; 1 (8): 5-6
  • Adhesion Properties of Inverted Polymer Solar Cells: Processing and Film Structure Parameters Organic Electronics Dupont, Stephanie, R., Voroshazi, E., Heremans, P., Dauskardt, Reinhold, H. 2013; 14: 1262–1270
  • Atmospheric Plasma Deposited Dense Silica Coatings on Plastics ACS APPLIED MATERIALS & INTERFACES Cui, L., Ranade, A. N., Matos, M. A., Pingree, L. S., Frot, T. J., Dubois, G., Dauskardt, R. H. 2012; 4 (12): 6587-6598

    Abstract

    We explore the application of a high-temperature precursor delivery system for depositing high boiling point organosilicate precursors on plastics using atmospheric plasma. Dense silica coatings were deposited on stretched poly(methyl methacrylate), polycarbonate and silicon substrates from the high boiling temperature precursor, 1, 2-bis(triethoxysilyl)ethane, and from two widely used low boiling temperature precursors, tetraethoxysilane and tetramethylcyclotetrasiloxane. The coating deposition rate, molecular network structure, density, Young's modulus and adhesion to plastics exhibited a strong dependence on the precursor delivery temperature and rate, and the functionality and number of silicon atoms in the precursor molecules. The Young's modulus of the coatings ranged from 6 to 34 GPa, depending strongly on the coating density. The adhesion of the coatings to plastics was affected by both the chemical structure of the precursor and the extent of exposure of the plastic substrate to the plasma during the initial stage of deposition. The optimum combinations of Young's modulus and adhesion were achieved with the high boiling point precursor which produced coatings with high Young's modulus and good adhesion compared to commercial polysiloxane hard coatings on plastics.

    View details for DOI 10.1021/am301723d

    View details for Web of Science ID 000313149800028

    View details for PubMedID 23182218

  • Experimental Study of Interfacial Fracture Toughness in a SiNx/PMMA Barrier Film ACS APPLIED MATERIALS & INTERFACES Kim, Y., Bulusu, A., Giordano, A. J., Marder, S. R., Dauskardt, R., Graham, S. 2012; 4 (12): 6710-6718

    View details for DOI 10.1021/am301880y

    View details for Web of Science ID 000313149800043

  • Low-temperature Al-Ge bonding for 3D integration JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B Crnogorac, F., Pease, F. R., Birringer, R. P., Dauskardt, R. H. 2012; 30 (6)

    View details for DOI 10.1116/1.4762844

    View details for Web of Science ID 000311667300078

  • Solar UV radiation reduces the barrier function of human skin PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Biniek, K., Levi, K., Dauskardt, R. H. 2012; 109 (42): 17111-17116

    Abstract

    The ubiquitous presence of solar UV radiation in human life is essential for vitamin D production but also leads to skin photoaging, damage, and malignancies. Photoaging and skin cancer have been extensively studied, but the effects of UV on the critical mechanical barrier function of the outermost layer of the epidermis, the stratum corneum (SC), are not understood. The SC is the first line of defense against environmental exposures like solar UV radiation, and its effects on UV targets within the SC and subsequent alterations in the mechanical properties and related barrier function are unclear. Alteration of the SC's mechanical properties can lead to severe macroscopic skin damage such as chapping and cracking and associated inflammation, infection, scarring, and abnormal desquamation. Here, we show that UV exposure has dramatic effects on cell cohesion and mechanical integrity that are related to its effects on the SC's intercellular components, including intercellular lipids and corneodesmosomes. We found that, although the keratin-controlled stiffness remained surprisingly constant with UV exposure, the intercellular strength, strain, and cohesion decreased markedly. We further show that solar UV radiation poses a double threat to skin by both increasing the biomechanical driving force for damage while simultaneously decreasing the skin's natural ability to resist, compromising the critical barrier function of the skin.

    View details for DOI 10.1073/pnas.1206851109

    View details for Web of Science ID 000310515800073

    View details for PubMedID 23027968

  • Film stresses and electrode buckling in organic solar cells SOLAR ENERGY MATERIALS AND SOLAR CELLS Brand, V., Levi, K., McGehee, M. D., Dauskardt, R. H. 2012; 103: 80-85
  • Scar Zones: Region-Specific Differences in Skin Tension May Determine Incisional Scar Formation PLASTIC AND RECONSTRUCTIVE SURGERY Wong, V. W., Levi, K., Akaishi, S., Schultz, G., Dauskardt, R. H. 2012; 129 (6): 1272-1276

    View details for DOI 10.1097/PRS.0b013e31824eca79

    View details for Web of Science ID 000304648500039

    View details for PubMedID 22634644

  • Moisture-Insensitive Polycarbosilane Films with Superior Mechanical Properties ACS APPLIED MATERIALS & INTERFACES Matsuda, Y., Rathore, J. S., Interrante, L. V., Dauskardt, R. H., Dubois, G. 2012; 4 (5): 2659-2663

    Abstract

    We report cross-linked polycarbosilane (CLPCS) films with superior mechanical properties and insensitivity to moisture. CLPCS are prepared by spin-coating and thermal curing of hexylene-bridged disilacyclobutane (DSCB) rings. The resulting films are siloxane-free and hydrophobic, and present good thermal stability and a low dielectric constant of k = 2.5 without the presence of supermicropores and mesopores. The elastic stiffness and fracture resistance of the films substantially exceed those of traditional porous organosilicate glasses because of their unique molecular structure. Moreover, the films show a remarkable insensitivity to moisture attack, which cannot be achieved by traditional organosilicate glasses containing siloxane bonds. These advantages make the films promising candidates for replacing traditional organosilicate glasses currently used in numerous applications, and for use in emerging nanoscience and energy applications that need protection from moisture and harsh environments.

    View details for DOI 10.1021/am300312y

    View details for Web of Science ID 000304285200047

    View details for PubMedID 22500550

  • Cohesion and device reliability in organic bulk heterojunction photovoltaic cells SOLAR ENERGY MATERIALS AND SOLAR CELLS Brand, V., Bruner, C., Dauskardt, R. H. 2012; 99: 182-189
  • Contamination and moisture absorption effects on the mechanical properties of catalyst coated membranes in PEM fuel cells INTERNATIONAL JOURNAL OF HYDROGEN ENERGY Jia, R., Dong, S., Hasegawa, T., Ye, J., Dauskardt, R. H. 2012; 37 (8): 6790-6797
  • Environmentally assisted debonding of copper/barrier interfaces ACTA MATERIALIA Birringer, R. P., Shaviv, R., Besser, P. R., Dauskardt, R. H. 2012; 60 (5): 2219-2228
  • Interlayer adhesion in roll-to-roll processed flexible inverted polymer solar cells Dupont, S. R., Oliver, M., Krebs, F. C., Dauskardt, R. H. ELSEVIER SCIENCE BV. 2012: 171-175
  • Fracture properties of hydrogenated amorphous silicon carbide thin films ACTA MATERIALIA Matsuda, Y., King, S. W., BIELEFELD, J., Xu, J., Dauskardt, R. H. 2012; 60 (2): 682-691
  • Film Stresses and Electrode Buckling in Organic Solar Cells Solar Energy Materials and Solar Cells Brand, V., Levi, K., McGehee, M., Dauskardt, Reinhold, H. 2012; 103: 80–85
  • Solar UV-Radiation Reduces the Barrier Function of Human Skin Biniek, K., Levi, K., Dauskardt, Reinhold, H. 2012
  • Moisture-Assisted Cracking and Atomistic Crack Path Meandering in Oxidized Hydrogenated Amorphous Silicon Carbide Films Journal of Applied Physics Matsuda, Y., King, Sean, W., Oliver, M., Dauskardt, Reinhold, H. 2012; 8 (113): 083521-1 - 7
  • Moisture Resistant Hybrid Layer for High-Performance Adhesion TECHCON Paredes, F., Giachino, M., Ananthakrishnan, N., Liff, Shawna, M., Dauskardt, Reinhold, H. 2012
  • Contamination and Moisture Absorption Effects on the Mechanical Properties of Catalyst Coated Membranes in PEM Fuel Cells International Journal of Hydrogen Energy Jia, R., Dong, S., Hasegawa, T., Ye, J., Dauskardt, Reinhold, H. 2012; 37: 6790 - 6797
  • Fracture Properties of Hydrogenated Amorphous Silicon Carbide Thin Films Acta Materialia Matsuda, Y., King, Sean, W., Bielefeld, J., Xu, J., Dauskardt, Reinhold, H. 2012; 60: 682–691
  • Atmospheric Plasma Deposited Dense Silica Coatings on Plastics ACS Applied Materials and Interfaces Dauskardt, R., H., Cui, L., Ranade, A., Matos, M., Pingree, L., Dubois, T. 2012; 4: 6587−6598
  • Low-Temperature Al-Ge Bonding for 3D Integration Journal of Vacuum Science and Technology B Crnogorac, F., Birringer, R., Dauskardt, R., Pease, R., F. W. 2012
  • The effect of anneal, solar irradiation and humidity on the adhesion/cohesion properties of P3HT:PCBM based inverted polymer solar cells 38th IEEE Photovoltaic Specialists Conference Dupont, Stephanie, R., Voroshazi, E., Heremans, P., Dauskardt, Reinhold, H. 2012: 3-8
  • Microprobing the Mechanical Effects of Varying Dielectric Porosity in Advanced Interconnect Structures Dauskardt, R., H., Hsing, A., Geisler, H., Ryan, V., Cheng, M., Machani, K. 2012
  • Low-Temperature Al–Ge Bonding for 3D Integration Journal of Vacuum Science and Technology Crnogoraca, F., Pease, Fabian, W., Birringer, Ryan, P., Dauskardt, Reinhold, H. 2012; 6 (30)
  • Interlayer Adhesion in Roll-To-Roll Processed Flexible Inverted Polymer Solar Cells Solar Energy Materials and Solar Cells Dupont, Stephanie, R., Oliver, M., Krebs, Frederik, C., Dauskardt, Reinhold, H. 2012; 97: 171–175
  • Environmentally Assisted Debonding of Copper / Barrier Interfaces Acta Materialia Birringer, R., Shaviv, R., Besser, P., Dauskardt, R. 2012; 60: 2219–2228
  • Contamination and Moisture Absorption in Catalyst Coated Membranes in PEM Fuel Cells International Journal of Hydrogen Energy Jia, R., Dong, S., Hasegawa, T., Ye, J., Dauskardt, Reinhold, H. 2012; 37: 6790 - 6797
  • Cohesion and Device Reliability in Organic Bulk Heterojunction Photovoltaic Cells Solar Energy Materials and Solar Cells Brand, V., Bruner, C., Dauskardt, Reinhold, H. 2012; 99: 182–189
  • An Experimental Study of Interfacial Fracture Toughness in a SiNx/PMMA Barrier Film ACS Applied Materials and Interfaces Kim, Y., Bulusu, A., Giordano, A., Marder, S., Dauskardt, R., Graham, S. 2012; 4: 6711-6719
  • The effect of anneal, solar irradiation and humidity on the adhesion/cohesion properties of P3HT:PCBM based inverted polymer solar cells 2012 38TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC) Dupont, S. R., Voroshazi, E., Heremans, P., Dauskardt, R. H. 2012: 3259-3262
  • Microprobing the Mechanical Effects of Varying Dielectric Porosity in Advanced Interconnect Structures 2012 IEEE INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE (IITC) Hsing, A., Geisler, H., Ryan, V., Cheng, M., Machani, K., Breuer, D., Lehr, M. U., Paul, J., Iacopi, F., Dauskardt, R. 2012
  • Mechanical durability of proton exchange membranes with catalyst platinum dispersion JOURNAL OF POWER SOURCES Jia, R., Han, B., Levi, K., Hasegawa, T., Ye, J., Dauskardt, R. H. 2011; 196 (20): 8234-8240
  • Effects of barrier composition and electroplating chemistry on adhesion and voiding in copper/dielectric diffusion barrier films JOURNAL OF APPLIED PHYSICS Birringer, R. P., Shaviv, R., Geiss, R. H., Read, D. T., Dauskardt, R. H. 2011; 110 (4)

    View details for DOI 10.1063/1.3624659

    View details for Web of Science ID 000294484300139

  • High yield four-point bend thin film adhesion testing techniques ENGINEERING FRACTURE MECHANICS Birringer, R. P., Chidester, P. J., Dauskardt, R. H. 2011; 78 (12): 2390-2398
  • Improving Cutaneous Scar Formation by Controlling the Mechanical Environment Large Animal and Phase I Studies ANNALS OF SURGERY Gurtner, G. C., Dauskardt, R. H., Wong, V. W., Bhatt, K. A., Wu, K., Vial, I. N., Padois, K., Korman, J. M., Longaker, M. T. 2011; 254 (2): 217-225

    Abstract

    To test the hypothesis that the mechanical environment of cutaneous wounds can control scar formation.Mechanical forces have been recognized to modulate myriad biologic processes, but the role of physical force in scar formation remains unclear. Furthermore, the therapeutic benefits of offloading cutaneous wounds with a device have not been rigorously tested.A mechanomodulating polymer device was utilized to manipulate the mechanical environment of closed cutaneous wounds in red Duroc swine. After 8 weeks, wounds subjected to different mechanical stress states underwent immunohistochemical analysis for fibrotic markers. In a phase I clinical study, 9 human patients undergoing elective abdominal surgery were treated postoperatively with a stress-shielding polymer on one side whereas the other side was treated as standard of care. Professional photographs were taken between 8 and 12 months postsurgery and evaluated using a visual analog scale by lay and professional panels. This study is registered with ClinicalTrials.gov, number NCT00766727.Stress shielding of swine incisions reduced histologic scar area by 6- and 9-fold compared to control and elevated stress states, respectively (P < 0.01 for both) and dramatically decreased the histologic expression of profibrotic markers. Closure of high-tension wounds induced human-like scar formation in the red Duroc, a phenotype effectively mitigated with stress shielding of wounds. In the study on humans, stress shielding of abdominal incisions significantly improved scar appearance (P = 0.004) compared with within-patient controls.These results indicate that mechanical manipulation of the wound environment with a dynamic stress-shielding polymer device can significantly reduce scar formation.

    View details for DOI 10.1097/SLA.0b013e318220b159

    View details for Web of Science ID 000292908700007

    View details for PubMedID 21606834

  • BIOMECHANICS OF THE BARRIER FUNCTION OF HUMAN SKIN: PREDICTING SKIN DAMAGE AND THE EFFECTS OF COSMETIC TREATMENTS JOURNAL OF COSMETIC SCIENCE Dauskardt, R. H. 2011; 62 (4): 422-423
  • Effect of cation contamination and hydrated pressure loading on the mechanical properties of proton exchange membranes JOURNAL OF POWER SOURCES Jia, R., Han, B., Levi, K., Hasegawa, T., Ye, J., Dauskardt, R. H. 2011; 196 (8): 3803-3809
  • Adhesion and degradation of hard coatings on poly (methyl methacrylate) substrates THIN SOLID FILMS Kamer, A., Larson-Smith, K., Pingree, L. S., Dauskardt, R. H. 2011; 519 (6): 1907-1913
  • Shear Microprobing of Chip-Package Interaction in Advanced Interconnect Structures 2011 IEEE INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE AND MATERIALS FOR ADVANCED METALLIZATION (IITC/MAM) Hsing, A. W., Kearney, A. V., Li, L., Xue, J., BRILLHART, M., Dauskardt, R. H. 2011
  • Effect of Cation Contamination and Hydrated Pressure Loading on the Mechanical Properties of Proton Exchange Membranes Journal of Power Sources Jia, R., Han, B., Levi, K., Hasegawa, T., Ye, J., Dauskardt, Reinhold, H. 2011; 196: 3803–3809
  • Axially Graded Index LEns as a non-tracking solar concentrator SOLAR OSA (Optics for Solar Energy) Conference Vaidya, N., Dauskardt, R., H., Solgaard, O. 2011
  • Improving Cutaneous Scar by Controlling the Mechanical Environment: Large Animal and Phase I Studies Annals of Surgery Gurtner, Geoffrey, C., Dauskardt, Reinhold, H., Wong, Victor, W., Bhatt, Kirit, A., Wu, K., Vial, Ivan, N. 2011; 2 (254): 217 – 225
  • Functionally Graded Hybrid Glass Layers for High-Performance Polymer/Silicon Adhesion 2011 TECHCON Giachino, M., Kim, T., Lui, Gillian, V., Ananthakrishnan, N., Liff, Shawna, M., Dauskardt, Reinhold, H. 2011
  • Adhesion and Degradation of Hard Coatings on Poly (methyl methacrylate) Substrates Thin Solid Films Kamer, A., Larson-Smith, K., Pingree, Liam, S. C., Dauskardt, Reinhold, H. 2011; 6 (519): 1907 - 1913
  • Effect of Glycerin on Drying Stresses in Human Stratum Corneum Journal of Dermatological Science Levi, K., Kwan, A., Rhines, Allison, S., Gorcea, M., Moore, David, J., Dauskardt, Reinhold, H. 2011; 2 (61): 129 - 131
  • New classes of ULK dielectrics with superior thermomechanical properties Advanced Metallization Conference Dauskardt, R., H., Matsuda, Y., King, Sean, W., Dubois, G., Bielefeld, J., Interrante, J. 2011
  • Shear Microprobing the Mechanical Effects Varying Dielectric Porosity in Advanced Interconnect Structures Dauskardt, R., H., Hsing, A., Geisler, H., Ryan, V., Iacopi, F., Cheng, M. 2011
  • Biomechanics of the Barrier Function of Human Stratum Corneum The Art and Science of Moisturizers Levi, K., Dauskardt, Reinhold, H. 2011
  • Scar Zones: Region-Specific Differences in Skin Tension May Determine Incisional Scar Formation Plastic and Reconstructive Surgery Wong, Victor, W., Levi, K., Akaishi, S., Schultz, G., Dauskardt, Reinhold, H. 2011; 6 (129): 1272 – 1276
  • High Yield Four-Point Bend Thin Film Adhesion Testing Techniques Engineering Fracture Mechanics Birringer, R., P., Dauskardt, R., H. 2011; 78: 2390 – 2398
  • Shear Microprobing of Chip-Package Interaction in Advanced Interconnect Structures Hsing, A., W., Kearney, A., V., Li, L., Xue, J., Brillhartand, M., Dauskardt, R., H. 2011
  • Mechanical Durability of Proton Exchange Membranes with Catalyst Platinum Dispersion Journal of Power Sources Jia, R., Han, B., Levi, K., Hasegawa, T., Ye, J., Dauskardt, Reinhold, H. 2011; 196: 8234 – 8240
  • Effects of Barrier Composition and Electroplating Chemistry on Adhesion and Voiding in Copper / Dielectric Diffusion Barrier Films Journal of Applied Physics Birringer, R., Shaviv, R., Geiss, Roy, H., Read, D., Dauskardt, R. 2011; 110: 044312
  • Future of PECVD and Spin-on ultra low-k Materials 2011 IEEE INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE AND MATERIALS FOR ADVANCED METALLIZATION (IITC/MAM) Volksen, W., Frot, T., Magbitang, T., Gates, S., Oliver, M., Dauskardt, R., Dubois, G. 2011
  • Emollient molecule effects on the drying stresses in human stratum corneum BRITISH JOURNAL OF DERMATOLOGY Levi, K., Kwan, A., Rhines, A. S., Gorcea, M., Moore, D. J., Dauskardt, R. H. 2010; 163 (4): 695-703

    Abstract

    Emollient molecules are widely used in skin care formulations to improve skin sensory properties and to alleviate dry skin but little is understood regarding their effects on skin biomechanical properties.To investigate the effects of emollient molecules on drying stresses in human stratum corneum (SC) and how these stresses are related to SC components and moisture content.The substrate curvature method was used to measure the drying stresses in isolated SC following exposure to selected emollient molecules. While SC stresses measured using this method have the same biaxial in vivo stress state and moisture exchange with the environment, a limitation of the method is that moisture cannot be replenished by the underlying skin layers. This provides an opportunity to study the direct effects of emollient treatments on the moisture content and the components of the SC. Attenuated total reflectance Fourier transform infrared spectroscopy was used to determine the effects of emollient molecules on SC lipid extraction and conformation. Results Emollient molecules resulted in a complex SC drying stress profile where stresses increased rapidly to peak values and then gradually decreased to significantly lower values compared with the control. The partially occlusive treatments also penetrated into the SC where they caused extraction and changes in lipid conformation. These effects together with their effects on SC moisture content are used to rationalize the drying stress profiles.Emollient molecules have dramatic effects on SC drying stresses that are related to their effects on intercellular lipids and SC moisture content.

    View details for DOI 10.1111/j.1365-2133.2010.09937.x

    View details for Web of Science ID 000282046600007

    View details for PubMedID 20633012

  • Solution chemistry effects on cracking and damage evolution during chemical-mechanical planarization JOURNAL OF MATERIALS RESEARCH Ong, M. D., Leduc, P., McKenzie, D. W., Farjot, T., Passemard, G., Maitrejean, S., Dauskardt, R. H. 2010; 25 (10): 1904-1909
  • Molecular Origins of the Mechanical Behavior of Hybrid Glasses ADVANCED FUNCTIONAL MATERIALS Oliver, M. S., Dubois, G., Sherwood, M., Gage, D. M., Dauskardt, R. H. 2010; 20 (17): 2884-2892
  • Mechanical Fatigue of Hybrid Glasses SMALL Oliver, M. S., Dauskardt, R. H. 2010; 6 (17): 1892-1896

    View details for DOI 10.1002/smll.201000667

    View details for Web of Science ID 000282268800009

    View details for PubMedID 20690136

  • Molecular structure and fracture properties of ZrOX/Epoxysilane hybrid films JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY Oliver, M. S., Blohowiak, K. Y., Dauskardt, R. H. 2010; 55 (3): 360-368
  • Bilayer metal gate electrodes with tunable work function: Adhesion and interface characterization JOURNAL OF APPLIED PHYSICS Birringer, R. P., Lu, C., Deal, M., Nishi, Y., Dauskardt, R. H. 2010; 108 (5)

    View details for DOI 10.1063/1.3466957

    View details for Web of Science ID 000282478900037

  • Drying stress and damage processes in human stratum corneum. International journal of cosmetic science Levi, K., Weber, R. J., Do, J. Q., Dauskardt, R. H. 2010; 32 (4): 276-293

    Abstract

    The drying stresses that develop in stratum corneum (SC) are crucial for its mechanical and biophysical function, its cosmetic feel and appearance, and play a central role in processes of dry skin damage. However, quantitative methods to characterize these stresses are lacking and little understanding exists regarding the effects of drying environment, chemical exposures and moisturizing treatments. We describe the application of a substrate curvature technique adapted for biological tissue to accurately characterize SC drying stresses as a function of time following environmental pre-conditioning and chemical treatment in a range of drying environments. SC stresses were observed to increase to stress levels of up to approximately 3 MPa over periods of 8 h depending on pretreatment and drying environment. A unique relationship between the SC stress and water in the drying environment was established. The effect of glycerol on lowering SC stresses and damaging surfactants on elevating SC stresses were quantified. Extensions of the method to continuous monitoring of SC stresses in response to changes in environmental moisture content and temperature are reported. Finally, a biomechanics framework to account for the SC drying stress as a mechanical driving force for dry skin damage is presented.

    View details for DOI 10.1111/j.1468-2494.2009.00557.x

    View details for PubMedID 19889042

  • Application of substrate curvature method to differentiate drying stresses in topical coatings and human stratum corneum. International journal of cosmetic science Levi, K., Dauskardt, R. H. 2010; 32 (4): 294-298

    Abstract

    Despite the extensive use of topical coatings in cosmetics, their effect on the mechanical properties of human skin and the perception of skin tightness in the form of drying stresses is not well understood. We describe the application of a recently developed substrate curvature technique to characterize stresses in drying and non-drying occlusive topical coatings. We then extend the technique to measure the combined effects of the coating applied to human stratum corneum (SC) where the overall drying stresses may have contributions from the coating, the SC and the interaction of the coating with the SC. We show how these separate contributions in the coating and SC layers can be differentiated.

    View details for DOI 10.1111/j.1468-2494.2010.00568.x

    View details for PubMedID 20384900

  • Molecular Mobility under Nanometer Scale Confinement NANO LETTERS Kim, T., Dauskardt, R. H. 2010; 10 (5): 1955-1959

    Abstract

    The mobility of organic molecules under nanoscale confinement differs greatly from that in the bulk. In this study we show that the conventional free volume dependent mobility relationship explained by the free volume theory of diffusion breaks down for diffusion of linear alkane molecules in organosilicate films with connected nanoporosity. Alkane mobility under such nanoscale confinement was observed to decrease with chain length and was lower than that reported in the bulk. While the activation energy for diffusion was similar to that in the bulk, it was found to decrease with chain length exactly opposite to the trend observed in the bulk. This suggests an increasing molecular free volume with chain length. The effects of molecular polarity and pore size on diffusion were also demonstrated. Molecular mobility was found to be suppressed with increasing molecular polarity and decreasing pore size.

    View details for DOI 10.1021/nl101169s

    View details for Web of Science ID 000277444900072

    View details for PubMedID 20392106

  • Bilayer metal gate electrodes with tunable work function: Mechanism and proposed model JOURNAL OF APPLIED PHYSICS Lu, C., Wong, G. M., Birringer, R., Dauskardt, R., Deal, M. D., Clemens, B. M., Nishi, Y. 2010; 107 (6)

    View details for DOI 10.1063/1.3326237

    View details for Web of Science ID 000276210800055

  • Effects of e-beam curing on glass structure and mechanical properties of nanoporous organosilicate thin films INTERNATIONAL JOURNAL OF MATERIALS RESEARCH Gage, D. M., Peng, L., Stebbins, J., Yim, K. S., Al-Bayati, A., Demos, A., Dauskardt, R. H. 2010; 101 (2): 228-235

    View details for DOI 10.3139/146.110275

    View details for Web of Science ID 000275653100008

  • Micromechanics and Damage Processes in Interconnect Structures 2010 PROCEEDINGS 60TH ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC) Hsing, A. W., Kearney, A. V., Li, L., Xue, J., BRILLHART, M., Dauskardt, R. H. 2010: 1303-1308
  • High Toughness and Moisture Insensitive Hydrogenated Amorphous Silicon Carbide Films for MEMS/NEMS CHEMICAL SENSORS 9 -AND- MEMS/NEMS 9 Matsuda, Y., King, S. W., Bielefeld, J., Dauskardt, R. H. 2010; 33 (8): 257-261

    View details for DOI 10.1149/1.3484129

    View details for Web of Science ID 000325342000031

  • Cohesive Toughness Of Low-k Film With Periodically Changing Elastic Modulus: Cube-Corner Indentation STRESS-INDUCED PHENOMENA IN METALLIZATION Yeap, K. B., Hangen, U., Ritz, Y., Kim, T., Dauskardt, R., Zsehech, E. 2010; 1300: 159-165
  • Solution Chemistry Effects on Cracking and Damage Evolution during Chemical Mechanical Planarization Journal of Materials Research Dauskardt, R., H., Ong, Markus, D., Leduc, P., McKenzie, Daniel, W., Farjot, T., Maitrejean, G. 2010; 10 (25): 1904 - 1909
  • Molecular Mobility in Nanoporous Organosilicate Thin Films NanoLetters Kim, T., Dauskardt, Reinhold, H. 2010; 5 (10): 1955-1959
  • Molecular Design of Ultra-Low-k Hybrid Glasses Oliver, M., Dubois, G., Dauskardt, R. 2010
  • Emollient Molecule Effects on the Drying Stresses in Human Stratum Corneum British Journal of Dermatology Levi, K., Kwan, A., Rhines, A., S., Gorcea, M., Moore, D., J., Dauskardt, R., H. 2010; 4 (163): 695 – 703
  • Optimized Adhesive Bonding to Bulk Metallic Glass Substrates SAMPE 2010 Yang, J., Oliver, M., S., Dauskardt, R., H. 2010
  • Bilayer Metal Gate Electrodes with Tunable Work Function– Mechanism and Proposed Model Journal of Applied Physics Lu, C., Wong, Gloria, M. T., Birringer, Ryan, P., Dauskardt, R., Deal, M., Clemens, Bruce, M. 2010; 107: 63710
  • Bilayer Metal Gate Electrodes with Tunable Work Function – Adhesion and Interface Characterization Journal of Applied Physics Birringer, Ryan, P., Lu, C., Deal, M., Nishi, Y., Dauskardt, Reinhold, H. 2010; 108: 53704
  • Microprobing the Mechanics of Complex Interconnect Structures Hsing, A., W., Kearney, A., V., Li, L., Xue, J., Brillhart, M., Dauskardt, R., H. 2010
  • High toughness and moisture insensitive hydrogenated amorphous silicon carbide films for MEMS/NEMS ECS Transactions Matsuda, Y., King, Sean, W., Bielefeld, J., Dauskardt, Reinhold, H. 2010; 8 (33): 257-261
  • Mechanical Properties of Hydrogenated Amorphous Silicon Carbide Thin Films Matsuda, Y., King, Sean, W., Bielefeld, J., Dauskardt, Reinhold, H. 2010
  • Molecular Structure and Fracture Properties of Hybrid Organic-Inorganic Films Journal of Sol-Gel Science and Technology Oliver, Mark, S., Blohowiak, Kay, Y., Dauskardt, Reinhold, H. 2010; 55: 360 - 368
  • Crack Growth Mechanisms in Sol-Gel Adhesive Coupling Layers SAMPE 2010 Oliver, M., S., Dauskardt, R., H. 2010
  • Effects of e-Beam Curing on Glass Structure and Mechanical Properties of Nanoporous Organosilicate Thin Films International Journal of Materials Research Dauskardt, R., H., Gage, David, M., Peng, L., Stebbins, J., Yim, K. S., Demos, A. 2010; 101: 228 - 235
  • Application of Substrate Curvature Method to Differentiate Drying Stresses in Topical Coatings and Human Stratum Corneum International Journal of Cosmetic Science Levi, K., Dauskardt, R., H. 2010: 1-5
  • Integration Challenges of Nanoporous Low Dielectric Constant Materials Kim, T., Dauskardt, R. H. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. 2009: 509-515
  • Surfactant-controlled damage evolution during chemical mechanical planarization of nanoporous films ACTA MATERIALIA Kim, T., Konno, T., Dauskardt, R. H. 2009; 57 (16): 4687-4696
  • Tailoring UV cure depth profiles for optimal mechanical properties of organosilicate thin films APPLIED PHYSICS LETTERS Kim, T., Chumakov, D., Zschech, E., Dauskardt, R. H. 2009; 95 (7)

    View details for DOI 10.1063/1.3190198

    View details for Web of Science ID 000269288300016

  • Surfactant Mobility in Nanoporous Glass Films NANO LETTERS Kim, T., Mackie, K., Zhong, Q., Peterson, M., Konno, T., Dauskardt, R. H. 2009; 9 (6): 2427-2432

    Abstract

    Polymer molecules when physically confined at nanometer length scales diffuse nonclassically and very differently depending on their molecular weight and the nature of the confinement. Long polymers that exhibit "snakelike" reptation based mobility in melts may diffuse faster in confined nanometer sized cylinders with pore diameter d approximately 15 nm, and short polymers subject to Rouse dynamics have shown signatures of reptation and slower diffusion when confined in nanoporous glass with d approximately 4 nm. However, the mobility of short polymers with radii of gyration similar to a smaller pore diameter (d < or = 2.1 nm) but with extended lengths well larger than the pore diameter has not as yet been studied. In this work, we demonstrate that those short molecules including nonionic surfactants can readily diffuse in strongly hydrophobic nanoporous glasses film with d < or = 2.1 nm. The diffusivity was found sensitive to molecular weight, hydrophilic-lipophilic balance, and molecular structure of surfactants. Remarkably, analysis of the measured diffusion coefficients reveals that short-chain surfactants exhibit signature of reptation based diffusion in the nanoscopic pore confinements. Such reptation mobility in agreement with theoretical predictions is not even observed in reptating polymer melts due to fluctuations of the entanglement pathway. The fixed pathways in the interconnected nanoporous films provide ideal nanoscale environments to explore mobility of confined molecules, and the results have implications for a number of technologies where nanoporous materials are in contact with surfactant molecules.

    View details for DOI 10.1021/nl901138p

    View details for Web of Science ID 000266969400042

    View details for PubMedID 19445484

  • Effects of thermal annealing and Si incorporation on bonding structure and fracture properties of diamond-like carbon films DIAMOND AND RELATED MATERIALS Choi, H. W., Gage, D. A., Dauskardt, R. H., Lee, K., Oh, K. H. 2009; 18 (4): 615-619
  • R&D for Solar Power ADVANCED MATERIALS & PROCESSES Khan, R., Dauskardt, R. H., Geyer, M., Pearsall, T. P., Meerfeld, D. W. 2009; 167 (1): 35-37
  • Solar Power R&D Advanced Materials and Processes Khan, M., R., Dauskardt, R., H., Geyer, M., Pearsall, T., P., Merfeld, D., W. 2009; 1 (167): 35 - 37
  • Tailoring UV Cure Depth Profiles for Optimal Mechanical Properties of Organosilicate Thin Films Applied Physics Letters Kim, T., DmytroChumakov, Reinhold, E. Z. 2009; 95: 71902
  • Drying Stress and Skin Damage in Human Stratum Corneum ,” International Journal of Cosmetic Science Levi, K., Weber, Robert, J., Do, James, Q., Dauskardt, R., H. 2009: 1-8
  • Surfactant-Controlled Damage Evolution during Chemical Mechanical Planarization of Nanoporous Films Acta Materialia Kim, T., Konno, T., Dauskardt, Reinhold, H. 2009; 57: 4687 - 4696
  • Adhesion, Cu Voiding, and Debonding Kinetics of Copper / Dielectric Diffusion Barrier Films Advanced Metallization Conference Dauskardt, R., H., Birringer, R., Shaviv, R., Mountsier, T., Reid, J., Geiss, J. 2009
  • Integration Challenges of Nanoporous Low Dielectric Constant Materials IEEE Transactions on Device and Materials Reliability Kim, T., Dauskardt, Reinhold, H. 2009; 4 (9)
  • Impact of CMP polish and pCMP Cleaning on adhesion of SiCN capping layer on PECVD-derived Porous OSG and Copper ULTRA CLEAN PROCESSING OF SEMICONDUCTOR SURFACES IX Gage, D. M., Thiel, A. D., Dauskardt, R. H., Haas, M. K., Matz, L. M., O'Neill, M. L., Wieder, T. M., Banerjee, G., Rao, M. B. 2009; 145-146: 377-380
  • Aluminum-Germanium Eutectic Bonding for 3D Integration 2009 IEEE INTERNATIONAL CONFERENCE ON 3D SYSTEMS INTEGRATION Crnogorac, F., Birringer, R., Dauskardt, R., Pease, F. 2009: 384-388
  • Pore size scaling for enhanced fracture resistance of nanoporous polymer thin films ACTA MATERIALIA Kearney, A. V., Litteken, C. S., Mohler, C. E., Mills, M. E., Dauskardt, R. H. 2008; 56 (20): 5946-5953
  • INNOVATIONS IN SOLAR POWER ADVANCED MATERIALS & PROCESSES Khan, M. R., Merfeld, D. W., Pearsall, T. P., Geyer, M., Dauskardt, R. H. 2008; 166 (11): 45-48
  • Superior mechanical properties of dense and porous organic/inorganic hybrid thin films Dubois, G., Volksen, W., Magbitang, T., Sherwood, M. H., Miller, R. D., Gage, D. M., Dauskardt, R. H. SPRINGER. 2008: 187-193
  • Tuning depth profiles of organosilicate films with ultraviolet curing JOURNAL OF APPLIED PHYSICS Kim, T., Tsuji, N., Matsushita, K., Kobayashi, N., Chumakov, D., Geisler, H., Zschech, E., Dauskardt, R. H. 2008; 104 (7)

    View details for DOI 10.1063/1.2999637

    View details for Web of Science ID 000260125500113

  • Molecular-controlled fracture and release of templated nanoporous organosilicate thin films ADVANCED MATERIALS Ong, M. D., Volksen, W., Dubois, G., Lee, V., Brock, P. J., Deline, V. R., Miller, R. D., Dauskardt, R. H. 2008; 20 (16): 3159-3164
  • Effects of UV cure on glass structure and fracture properties of nanoporous carbon-doped oxide thin films JOURNAL OF APPLIED PHYSICS Gage, D. M., Stebbins, J. F., Peng, L., Cui, Z., Al-Bayati, A., MacWilliams, K. P., M'saad, H., Dauskardt, R. H. 2008; 104 (4)

    View details for DOI 10.1063/1.2968438

    View details for Web of Science ID 000259265100026

  • Fatigue damage initiation and growth from artificial defects in Zr-based metallic glass ACTA MATERIALIA Menzel, B. C., Dauskardt, R. H. 2008; 56 (13): 2955-2965
  • Depth dependence of ultraviolet curing of organosilicate low-k thin films JOURNAL OF APPLIED PHYSICS Kim, T., Tsuji, N., Kemeling, N., Matsushita, K., Chumakov, D., Geisler, H., Zschech, E., Dauskardt, R. H. 2008; 103 (6)

    View details for DOI 10.1063/1.2894727

    View details for Web of Science ID 000254536900094

  • Characteristic of silver doped DLC films on surface properties and protein adsorption DIAMOND AND RELATED MATERIALS Choi, H. W., Dauskardt, R. H., Lee, S., Lee, K., Oh, K. H. 2008; 17 (3): 252-257
  • Quantitative roadmap for optimizing CMP of ultra-low-k dielectrics PROCEEDINGS OF THE IEEE 2008 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Kim, T., Konno, T., Yamanaka, T., Dauskardt, R. H. 2008: 171-173
  • Tuning Depth Profiles of Organosilicate Films with Ultraviolet Curing Journal of Applied Physics Dauskardt, R., H., Kim, T., Tsuji, N., Matsushita, K., Chumakov, D., Zschech, H. 2008; 104: 74113
  • Fatigue Damage Initiation and Growth from Artificial Defects in Zr-Based Metallic Glass Acta Materialia Menzel, B., Dauskardt, R., H. 2008; 56: 2955 – 2965
  • Innovations in Solar Power Advanced Materials and Processes Khan, M., R., Merfeld, D., W., Pearsall, T., P., Geyer, M., Dauskardt, R., H. 2008; 11 (166): 45 - 48
  • Effects of Current Density, Environments and Temperature on Adhesion and Debonding Kinetics of Cu / Barrier Interfaces Advanced Metallization Conference Birringer, R., Shaviv, R., Dauskardt, Reinhold, H. 2008: 331-336
  • Characteristic of Silver Doped DLC Films on Surface Properties and Protein Adsorption Diamond and Related Materials Choi, H., W., Dauskardt, R., H., Lee, S, C., Lee, K. R., Oh, K., H. 2008
  • Pore Size Scaling for Enhanced Fracture Resistance of Nanoporous Polymer Thin Films Acta Materialia Kearney, A., V., Litteken, C., S., Mohler, C., E., Mills, M., E., Dauskardt, R., H. 2008; 56: 5946–5953
  • Effects of UV Cure on Glass Structure and Fracture Properties of Nanoporous Carbon-Doped Oxide Thin Films Journal of Applied Physics Dauskardt, R., H., Gage, D., M., Stebbins, J., F., Peng, L., Cui, Z., MacWilliams, A. 2008; 104: 43513
  • Depth Dependence of Ultraviolet (UV) Curing of Organosilicate Low-K Films Journal of Applied Physics Kim, T., Tsuji, N., Matsushita, K., Chumakov, D., Zschech, E., Dauskardt, Reinhold, H. 2008; 103: 64108
  • Tuning Depth Profiles of Low-k Dielectrics with UV Curing Advanced Metallization Conference Dauskardt, R., H., Kim, T., Tsuji, N., Hilst, J. d., Kobayashi, K. N., Geisler, D. 2008: 337-340
  • Reliability of Adhesive Interphases for Titanium-Graphite Laminates SAMPE 2008 Oliver, Mark, S., Blohowiak, Kay, Y., Dauskardt, Reinhold, H. 2008
  • Optimizing CMP for Ultra-Low-k Dielectrics 13th International Chemical Mechanical Planarization Conference for ULSI Multilevel Interconnection Kim, T., Konno, T., Yamanaka, T., Dauskardt, Reinhold, H. 2008
  • Molecular Controlled Fracture and Release of Templated Nanoporous Organosilicate Thin Films Advanced Materials Dauskardt, R., H., Ong, M., Volksen, W., Dubois, G., Lee, V., Deline, P., J. 2008; 20: 3159–3164
  • Effect of Corneodesmosome Degradation on the Intercellular Delamination of Human Stratum Corneum Journal of Investigative Dermatology Levi, K., Baxter, J., Meldrum, H., Misra, M., Pashkovski, E., Dauskardt, R., H. 2008; 9 (128): 2345 – 2347
  • The Role of Friction and Loading Parameters on Four-Point Bend Adhesion Measurements Journal of Materials Research Gage, D., M., Kim, K., Litteken, C., S., Dauskardt, R., H. 2008; 1 (23): 87 – 96
  • UV, e-beam, and thermal curing of low-k organosilicates: Effects on glass structure and mechanical properties ADVANCED METALLIZATION CONFERENCE 2007 (AMC 2007) Gage, D. M., Yim, K. S., Al-Bayati, A., Demos, A., M'saad, H., Dauskardt, R. H. 2008; 23: 433-438
  • Depth dependence of UV curing of organosilicate low-k thin films ADVANCED METALLIZATION CONFERENCE 2007 (AMC 2007) Kim, T., Tsuji, N., van der Hilst, J., Kemeling, N., Matsushita, K., Kobayashi, N., Chumakov, D., Geisler, H., Zschech, E., Dauskardt, R. H. 2008; 23: 455-458
  • Role of friction and loading parameters in four-point bend adhesion measurements JOURNAL OF MATERIALS RESEARCH Gage, D. M., Kim, K., Litteken, C. S., Dauskardt, R. H. 2008; 23 (1): 87-96
  • Molecular network reinforcement of sol-gel glasses ADVANCED MATERIALS Dubois, G., Volksen, W., Magbitang, T., Miller, R. D., Gage, D. M., Dauskardt, R. H. 2007; 19 (22): 3989-?
  • Time-dependant intercellular delamination of human stratum corneum JOURNAL OF MATERIALS SCIENCE Wu, K. S., Li, J., Ananthapadmanabhan, K. P., Dauskardt, R. H. 2007; 42 (21): 8986-8994
  • Response to comments on "The fatigue endurance limit of a Zr-based bulk metallic glass" SCRIPTA MATERIALIA Menzel, B. C., Dauskardt, R. H. 2007; 57 (1): 69-71
  • Adhesion between template materials and UV-cured nanoimprint resists JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B Houle, F. A., Guyer, E., Miller, D. C., Dauskardt, R. 2007; 25 (4): 1179-1185

    View details for DOI 10.1116/1.2746336

    View details for Web of Science ID 000249170100015

  • Anomalous debonding behavior of a polymer/inorganic interface ACTA MATERIALIA Sharratt, B. M., Wang, L. C., Dauskardt, R. H. 2007; 55 (10): 3601-3609
  • Aqueous solution diffusion in hydrophobic nanoporous thin-film glasses JOURNAL OF MATERIALS RESEARCH Guyer, E. P., Gantz, J., Dauskardt, R. H. 2007; 22 (3): 710-718
  • Thermomechanical properties of thin organosilicate glass films treated with ultraviolet-assisted cure ACTA MATERIALIA Iacopi, F., Beyer, G., Travaly, Y., Waldfried, C., Gage, D. M., Dauskardt, R. H., Houthoofd, K., Jacobs, P., Adriaensens, P., Schulze, K., Schulz, S. E., List, S., Carlotti, G. 2007; 55 (4): 1407-1414
  • Assessing the effect of die sealing in Cu/low-k structures PROCEEDINGS OF THE IEEE 2007 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Kearney, A. V., Vairagar, A. V., Geisler, H., Zschech, E., Dauskardt, R. H. 2007: 138-140
  • Time-Dependant Intercellular Delamination of Human Stratum Corneum Journal of Materials Science Wu, K., S., Li, J., Ananthapadmanabhan, K., P., Dauskardt, R., H. 2007; 42: 8986 – 8994
  • Diffusion of Aqueous Solutions into Hydrophobic Nanoporous Thin-Films Journal of Materials Research Guyer, E., P., Gantz, J., Dauskardt, R., H. 2007; 3 (22): 710-718
  • Adhesion between template materials and UV-cured nanoimprint resists J. Vac. Sci. Technol. B Houle, F., A., Guyer, E., P., Miller, D., C., Dauskardt, R., H. 2007; 4 (25): 1179
  • A Novel Bonding Technique Using Metal-Induced Crystallization of Amorphous Silicon Mater. Res. Soc. Symp. Proc. Ong, Markus, D., Dauskardt, Reinhold, H. 2007
  • Stress and Slurry Chemistry Effects on CMP Damage of Ultra-Low-k Dielectrics Kim, T., Zhong, Q., Peterson, M., Tam, H., Konno, T., Dauskardt, Reinhold, H. 2007
  • Effect of Silane Functional Group on Adhesion of Selected Epoxies for Microelectronic Packaging Journal of Microelectronics and Electronic Packaging Borrego, M., Jenkins, Dauskardt, R., H., Bravman, J., C. 2007; 1 (4): 8-15
  • Anomalous Debonding Behavior of a Polymer/Inorganic Interface Acta Materialia Sharratt, B., M., Wang, L., C., Dauskardt, R., H. 2007; 55: 3601–3609
  • Response to Comments on The Fatigue Endurance Limit of a Zr-Based Bulk Metallic Glass Scripta Materialia Menzel, B., Dauskardt, R., H. 2007; 57: 69–71
  • Molecular Network Reinforcement of sol-gel glasses Advanced Materials Dubois, G., Volksen, W., Magbitang, T., Miller, R., D., Gage, D., M., Dauskardt, R., H. 2007; 19: 3989–3994
  • Assessing the Effect of Die Sealing in Cu/Low-k Structures Kearney, Andrew, V., Vairagar, Anand, V., Geisler, H., Zschech, E., Dauskardt, Reinhold, H. 2007
  • Thermo-mechanical properties of thin organosilicate glass films treated with Ultra-Violet –assisted cure Acta Materialia Iacopia, F., Beyer, G., Travaly, Y., Waldfried, C., Gage, D., M., Dauskardt, R., H. 2007; 4 (55): 407-1414
  • Stress and slurry chemistry effects on CMP damage of ultra-low-k dielectrics PROCEEDINGS OF THE IEEE 2007 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Kim, T., Zhong, Q., Peterson, M., Tam, H., Konno, T., Dauskardt, R. H. 2007: 129-131
  • A novel bonding technique using metal-induced crystallization of amorphous silicon AMORPHOUS AND POLYCRYSTALLINE THIN-FILM SILICON SCIENCE AND TECHNOLOGY 2007 Ong, M. D., Dauskardt, R. H. 2007; 989: 109-114
  • Influence of porosity and film thickness on adhesion of nanoporous organic dielectrics ADVANCED METALLIZATION CONFERENCE 2006 (AMC 2006) Kearney, A. V., Chang, H., Mills, M. E., Dauskardt, R. H. 2007: 517-520
  • Effect of UV cure on adhesive and cohesive failure of low-k films: Implications for integration ADVANCED METALLIZATION CONFERENCE 2006 (AMC 2006) Gage, D. M., Stebbins, J. F., Dauskardt, R. H. 2007: 327-330
  • Non-uniform UV curing effects on mechanical and fracture properties of organosilicate low-k thin films ADVANCED METALLIZATION CONFERENCE 2006 (AMC 2006) Kim, T., Tsuji, N., Kemeling, N., Matsushita, K., Dauskardt, R. H. 2007: 389-394
  • Graded delamination behavior of human stratum corneum BIOMATERIALS Wu, K. S., Stefik, M. M., Ananthapadmanabhan, K. P., Dauskardt, R. H. 2006; 27 (34): 5861-5870

    Abstract

    An in vitro adhesion test method has been adapted to quantify the through-thickness intercellular delamination energy of isolated human stratum corneum (SC). Both untreated and delipidized tissues were tested. Measured delamination energies were found to increase from approximately 3 J/m(2) near the surface to approximately 15 J/m(2) for the inner layers of the tissue. For delipidized SC, the location of the initial debond was located closer to the center of the tissue. Delamination energy values were elevated compared to untreated specimens, increasing from approximately 7 J/m(2) near the surface to approximately 18 J/m(2) for the inner layers of the SC. Further tests were run to measure delamination energies of SC as a function of hydration (15-100% relative humidity (RH)) at approximately 25 degrees C and as a function of temperature (10-90 degrees C) at several hydrations (15, 45, 100% RH). Delamination energies were observed to decrease with increasing hydration and increasing temperature with the most significant changes occurring for 100% RH conditioned SC. Additional SC was treated with pH-buffered solutions (pH 4.2, 6.7, 9.9) and selected surfactant solutions (1%, 10% wt/wt sodium dodecyl sulfate (SDS)) for comparison to untreated controls. While statistically significant differences were observed, the SC was found to be resistant to large changes in delamination energy with pH and 1% wt/wt SDS treatments with values in the range 4.2-5.1J/m(2) compared to control values of 4.4 J/m(2). More substantially elevated values were observed for SC treated with a 10%wt/wt SDS solution (6.6J/m(2)) and a chloroform-methanol extraction (11.2J/m(2)).

    View details for DOI 10.1016/j.biomaterials.2006.08.008

    View details for Web of Science ID 000241272300013

    View details for PubMedID 16934326

  • Mode II fracture behavior of a Zr-based bulk metallic glass JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS Flores, K. M., Dauskardt, R. H. 2006; 54 (11): 2418-2435
  • The fatigue endurance limit of a Zr-based bulk metallic glass SCRIPTA MATERIALIA Menzel, B. C., Dauskardt, R. H. 2006; 55 (7): 601-604
  • Fracture of nanoporous methyl silsesquioxane thin-film glasses JOURNAL OF MATERIALS RESEARCH Guyer, E. P., Patz, M., Dauskardt, R. H. 2006; 21 (4): 882-894
  • Short-ranged structural rearrangement and enhancement of mechanical properties of organosilicate glasses induced by ultraviolet radiation JOURNAL OF APPLIED PHYSICS Iacopi, F., Travaly, Y., Eyckens, B., Waldfried, C., Abell, T., Guyer, E. P., Gage, D. M., Dauskardt, R. H., Sajavaara, T., Houthoofd, K., Grobet, P., Jacobs, P., Maex, K. 2006; 99 (5)

    View details for DOI 10.1063/1.2178393

    View details for Web of Science ID 000236002900019

  • Stress-life fatigue behavior of a Zr-based bulk metallic glass ACTA MATERIALIA Menzel, B. C., Dauskardt, R. H. 2006; 54 (4): 935-943
  • Fatigue damage in bulk metallic glass I: Simulation SCRIPTA MATERIALIA Cameron, K. K., Dauskardt, R. H. 2006; 54 (3): 349-353
  • Fatigue damage in bulk metallic glass II: Experiments SCRIPTA MATERIALIA Hess, P. A., Menzel, B. C., Dauskardt, R. H. 2006; 54 (3): 355-361
  • Mechanical properties of human stratum corneum: Effects of temperature, hydration, and chemical treatment BIOMATERIALS Wu, K. S., van Osdol, W. W., Dauskardt, R. H. 2006; 27 (5): 785-795

    Abstract

    An in vitro mechanics approach to quantify the intercellular delamination energy and mechanical behavior of isolated human stratum corneum (SC) in a direction perpendicular to the skin surface is presented. The effects of temperature, hydration, and a chloroform-methanol treatment to remove intercellular lipids were explored. The delamination energy for debonding of cells within the SC layer was found to be sensitive to the moisture content of the tissue and to the test temperature. Delamination energies for untreated stratum corneum were measured in the range of 1-8J/m(2) depending on test temperature. Fully hydrated specimen energies decreased with increasing temperature, while room-humidity-hydrated specimens exhibited more constant values of 2-4J/m(2). Lipid-extracted specimens exhibited higher delamination energies of approximately 12J/m(2), with values decreasing to approximately 4J/m(2) with increasing test temperature. The peak separation stress decreased with increasing temperature and hydration, but lipid-extracted specimens exhibited higher peak stresses than untreated controls. The delaminated surfaces revealed an intercellular failure path with no evidence of tearing or fracture of cells. The highly anisotropic mechanical behavior of the SC is discussed in relation to the underlying SC structure.

    View details for DOI 10.1016/j.biomaterials.2005.06.019

    View details for Web of Science ID 000233858000012

    View details for PubMedID 16095683

  • UV curing effects on glass structure and mechanical properties of organosilicate low-k thin films PROCEEDINGS OF THE IEEE 2006 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Gage, D. M., Guyer, E. P., Stebbins, J. F., Cui, Z., Al-Bayati, A., Demos, A., MacWilliams, K. P., Dauskardt, R. H. 2006: 149-151
  • Adhesion between template materials and UV-cured nanoimprint resists ADVANCES IN RESIST TECHNOLOGY AND PROCESSING XXIII, PTS 1 AND 2 Houle, F. A., Guyer, E., Miller, D. C., Dauskardt, R., Rice, E., Hamilton, J. 2006; 6153: U548-U555

    View details for DOI 10.1117/12.655698

    View details for Web of Science ID 000238175500047

  • Short-ranged structural rearrangement and enhancement of mechanical properties of organosilicate glasses induced by UltraViolet radiation Journal of Applied Physics Dauskardt, R., H., Iacopi, F., Travaly, Y., Eyckens, B., Waldfried, C., Guyer, T. 2006; 99: 053511-1 - 053511-7
  • Adhesion between template materials and UV-cured nanoimprint resists Houle, F., A., Guyerb, E., Millera, D., C., Dauskardt, R., H., Rice, E., Hamilton, J. 2006
  • Stress and Slurry Chemistry Effects on Cracking and Damage Evolution during CMP: Implications for Next Technology Nodes Twelfth International Conference on Chemical-Mechanical Polish (CMP) Planarization for ULSI Multilevel Interconnection (CMP-MIC) Dauskardt, Reinhold, H., Kim, T., Zhong, Q., Peterson, M., Tam, H., Konno, T. 2006
  • Non-Uniform UV Curing Effects on Mechanical and Fracture Properties of Organosilicate Low-k Thin Films Kim, T., Tsuji, N., Kemeling, N., Matsushita, K., Dauskardt, R., H. 2006
  • Effect of UV Cure on Adhesive and Cohesive Failure of Low-k Films: Implications for Integration Gage, D., M., Stebbins, J., F., Dauskardt, R., H. 2006
  • Fracture of Nanoporous Methyl Silsesquioxane Thin-Film Glasses Journal of Materials Research Guyer, E., P., Patz, M., Dauskardt, R., H. 2006; 4 (21)
  • The Role of Nanoscale Confinement of Adhesion Promoting Molecules on the Adhesion and Resistance to Moisture Attack at the Polymer/Silicon Nitride Interface Sharratt, B., M., Dauskardt, R., H. 2006
  • Influence of Porosity and Film Thickness on Adhesion of Nanoporous Organic Dielectrics Kearney, Andrew, V., Chang, H., Mills, Michael, E., Dauskardt, Reinhold, H. 2006
  • Stress-Life Fatigue Behavior of a Zr-Based Bulk Metallic Glass Acta Materialia Menzel, B., Dauskardt, R., H. 2006; 4 (54): 935 - 943
  • Mode II Fracture Behavior of a Zr-Based Bulk Metallic Glass Journal of the Mechanics and Physics of Solids Flores, K., M., Dauskardt, R., H. 2006; 11 (54): 2418 – 2435
  • Effects of Nonionic Surfactants on the Fracture of Nanoporous Methylsilsesquioxane Thin-Film Glasses International Conference of Planarization/CMP Technology Kim, T., Zhong, Q., Peterson, M., Tam, H., Konno, T., Dauskardt, Reinhold, H. 2006
  • The Fatigue Endurance Limit of a Zr-Based Bulk Metallic Glass Scripta Materialia Menzel, B., Dauskardt, R., H. 2006; 55: 601 - 604
  • UV-assisted curing: an effective technique for toughening low-k organosilicate films ADVANCED METALLIZATION CONFERENCE 2005 (AMC 2005) Iacopi, F., Waldfried, C., Houthoofd, K., Guyer, E. P., Gage, D. M., Carlotti, G., Travaly, Y., Abell, T., Escorcia, O., Beyer, G., Berry, I., Dauskardt, R. H., Maex, K. 2006: 247-254
  • Fracture properties of porous MSSQ films: Impact of porogen loading and burnout MATERIALS, TECHNOLOGY AND RELIABILITY OF LOW-K DIELECTRICS AND COPPER INTERCONNECTS Ong, M. D., Jousseaume, V., Maitrejean, S., Dauskardt, R. H. 2006; 914: 15-20
  • Residual stress effects on plastic deformation and interfacial fracture in thin-film structures ACTA MATERIALIA Litteken, C. S., Strohband, S., Dauskardt, R. H. 2005; 53 (7): 1955-1961
  • Indentation fracture toughness of amorphous steel JOURNAL OF MATERIALS RESEARCH Hess, P. A., Poon, S. J., Shiflet, G. J., Dauskardt, R. H. 2005; 20 (4): 783-786
  • Effect of solution pH on the accelerated cracking of nanoporous thin-film glasses JOURNAL OF MATERIALS RESEARCH Guyer, E. P., Dauskardt, R. H. 2005; 20 (3): 680-687
  • Comparison of the telephone cord delamination method for measuring interfacial adhesion with the four-point bending method ACTA MATERIALIA Lee, A., Litteken, C. S., Dauskardt, R. H., Nix, W. D. 2005; 53 (3): 609-616
  • Effect of porosity on reducing cohesive strength and accelerating crack growth in ultra low-k thin-films PROCEEDINGS OF THE IEEE 2005 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Guyer, E. P., Dauskardt, R. H. 2005: 223-225
  • Benchmarking four point bend adhesion testing: The effect of test parameters on adhesion energy CHARACTERIZATION AND METROLOGY FOR ULSI TECHNOLOGY 2005 Cui, Z. J., Dixit, G., Xia, L. Q., Demos, A., Kim, B. H., Witty, D., M'Saad, H., Dauskardt, R. H. 2005; 788: 507-511
  • Accelerated Debonding and Cracking in Thin-Film Structures: Chemical Reaction Rate and Loading Effects Guyer, E., P., Dauskardt, R., H. 2005
  • Effect of Solution pH on the Accelerated Cracking of Nanoporous Thin-Films Glasses Journal of Materials Research Guyer, E., P., Dauskardt, R., H. 2005; 3 (20): 680 – 687
  • Mechanisms of Fatigue Damage Formation and Evolution in Zr-Based Bulk Metallic Glass Hess, P., A., Menzel, B., Dauskardt, R., H. 2005
  • Fracture in Thin-Film Structures for Device Technologies: New Material and Length Scale Challenges Litteken, C., Dauskardt, R., H. 2005
  • Effect of interface chemistry and thermomechanical loading on debonding of polymer/silicon interfaces: Implications for device reliability. Sharratt, B., M., Wang, L., C., Dauskardt, R., H. 2005
  • Effects of Friction and Loading Parameters on Four-Point Bend Adhesion Measurements of Low-k Thin Film Interconnect Structures Gage, D., M., Kim, K., Litteken, C., S., Dauskardt, R., H. 2005
  • Indentation Fracture Toughness of Amorphous Steel Journal of Materials Research Hess, P., A., Poon, S., J., Shiflet, G., J., Dauskardt, R., H. 2005; 4 (20): 783 – 786
  • Benchmarking Four Point Bend Adhesion Testing: The Effect of Test Parameters On Adhesion Energy 2005 International Conference on Characterization and Metrology for ULSI Technology Dauskardt, R., H., Cui, Z., Dixit, G., Xia, L., Demos, A., Witty, B., H. 2005
  • Mechanical Properties of Human Stratum Corneum: Effects of Temperature, Hydration, and Chemical Treatment Biomaterials Wu, K., S., Osdol, W., W. van, Dauskardt, R., H. 2005; 5 (27): 785-795
  • Effects of friction and loading parameters on four-point bend adhesion measurements of low-k thin film interconnect structures PROCEEDINGS OF THE IEEE 2005 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Gage, D. M., Kim, K., Litteken, C. S., Dauskardt, R. H. 2005: 42-44
  • Electrical technique for monitoring crack growth in thin-film fracture mechanics specimens JOURNAL OF MATERIALS RESEARCH Guyer, E. P., Dauskardt, R. H. 2004; 19 (11): 3139-3144
  • Failure of medullary tubes - A materials analysis INJURY-INTERNATIONAL JOURNAL OF THE CARE OF THE INJURED Taub, M., Wera, G., Dauskardt, R. H., Mohler, D. G. 2004; 35 (9): 878-882

    Abstract

    The objective of this study is to determine the effects of autoclaving on the stress, strain, ultimate tensile strength (UTS), fracture strain, modulus, and yield stress of nylon medullary tubes. There are three reports describing nylon medullary tube failure in the literature. All cases involved the use of nylon medullary tubes during open reduction internal fixation of fractured long bones. We demonstrated increased brittleness and decreased strength with increased exposure of medullary tubes to autoclaving, most dramatically after 100 autoclave cycles. Visual inspection of tubes is a clear indication of material degradation after repeated autoclaving. Furthermore, there is a significant difference in ultimate tensile strength (P < 0.0001) between tubes exposed to less than 100 sterilization cycles compared to tubes exposed to greater than 100 cycles. Likewise, there is a significant decrease in yield stress (P < 0.0004) between the same groups. We recommend disposal and replacement of nylon medullary tubes before they are exposed to 100 autoclaving cycles in order to avoid failure of the device.

    View details for DOI 10.1016/S0020-1383(03)00307-3

    View details for Web of Science ID 000223692100007

    View details for PubMedID 15302240

  • Fatigue crack growth in micro-machined single-crystal silicon JOURNAL OF MATERIALS RESEARCH Renuart, E. D., Fitzgerald, A. M., Kenny, T. W., Dauskardt, R. H. 2004; 19 (9): 2635-2640
  • Mechanisms of elevated temperature fatigue crack growth in Zr-Ti-Cu-Ni-Be bulk metallic glass ACTA MATERIALIA Hess, P. A., Dauskardt, R. H. 2004; 52 (12): 3525-3533
  • Toughening of nanoporous glasses using porogen residuals NATURE MATERIALS Maidenberg, D. A., Volksen, W., Miller, R. D., Dauskardt, R. H. 2004; 3 (7): 464-469

    Abstract

    Nanoporous glasses are inherently brittle materials that become increasingly fragile with increasing porosity. We show that remarkable increases in fracture energy can be obtained from remnants of the porogen molecules used to create the nanoscale pores. The interfacial fracture energy of approximately 2.6 J m(-2) for dense methylsilsesquioxane glass films is shown to increase by over one order of magnitude to >30 J m(-2) for glasses containing 50 vol.% porosity. The increased fracture resistance is related to a powerful molecular-bridging mechanism that was modelled using bridging mechanics. The study demonstrates that significant increases in interfacial fracture energy may be obtained using strategies involving controlled decomposition of the porogen molecule during processing of nanoporous glasses. The implications are important for a range of emerging optical, electronic and biological technologies that use nanoporous thin films, but are limited by the degradation of mechanical properties with increasing porosity.

    View details for DOI 10.1038/nmat1153

    View details for Web of Science ID 000222389100015

    View details for PubMedID 15220912

  • Fracture and deformation of bulk metallic glasses and their composites INTERMETALLICS Flores, K. M., Dauskardt, R. H. 2004; 12 (7-9): 1025-1029
  • Accelerated crack growth of nanoporous low-k glasses in CMP slurry enviromments PROCEEDINGS OF THE IEEE 2004 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Guyer, E. P., Dauskardt, R. H. 2004: 236-238
  • The prospects for mechanical ratcheting of bulk metallic glasses AMORPHOUS AND NANOCRYSTALLINE METALS Wright, W. J., Dauskardt, R. H., Nix, W. D. 2004; 806: 319-324
  • Accelerated Crack Growth of Nanoporous Low-k Glasses in CMP Slurry Environment Guyer, E., P., Dauskardt, R., H. 2004
  • Reliability of Thin-Film Structures for Device Technologies: Adhesion, New Materials and Length Scale Challenges Interfaces In Electronic Materials, Electrochemical Society Guyer, E., P., Litteken, C., Maidenberg, D., Dauskardt, R., H. 2004
  • Effect of Aqueous Solution Chemistry on the Accelerated Cracking of Lithographically Patterned Arrays of Copper and Nanoporous Thin-Films MRS Symposium ProceedingsMaterials Research Society Guyer, E., P., Dauskardt, R., H. 2004
  • Electrical Resistance Technique to Measure Crack Length in Fracture Mechanics Specimens Containing Thin-Film Structures Journal of Materials Research Guyer, E., P., Dauskardt, R., H. 2004; 11 (19): 3139-3144
  • Fatigue Loading Effects on Underfull/Passivation Interface Reliability for High Density Packaging Sharratt, B., Dauskardt, R., H. 2004
  • Debonding under fatigue loading at polymer/inorganic interfaces. Sharratt, B., M., Dauskardt, R., H. 2004
  • Accelerated Crack Growth of Nanoporous Low-k Glasses in Aqueous Solutions Guyer, E., P., Dauskardt, R., H. 2004
  • Fracture and Deformation of Metallic Glasses and their Composites Intermetallics Flores, K., M., Dauskardt, R., H. 2004; 7-9 (12): 1025-1029
  • Failure of Medullary Tubes: A Materials Analysis Injury, International Journal of the Care of the Injured Taub, M., B., Wera, G., Dauskardt, R., H., Mohler, D., G. 2004; 35: 878 – 882
  • Fatigue Crack Growth in Micro-Machined Single Crystal Silicon Specimens Journal of Materials Research Renuart, E., Fitzgerald, A., M., Kenny, T., W., Dauskardt, R., H. 2004; 9 (19): 2635-2640
  • Toughening of Nanoporous Glasses Using Porogen Residuals Nature Materials Maidenberg, D., A., Volksen, W., Miller, R., D., Dauskardt, R., H. published online. 2004: 464 - 469
  • Important Factors for Silane Adhesion: Surface Coverage, Functionality, and Chain Length Journal of Adhesion Science and Technology Jenkins, M., L., Dauskardt, R., H., Bravman, J., C. 2004; 13 (18): 1483 -1588
  • Fracture of Nanoporous Thin-Film Glasses Nature Materials Guyer, E., P., Dauskardt, R., H. 2004; 3: 53–57
  • Elevated Temperature Fatigue Crack Propagation of a Zr-Based Bulk Metallic Glass Acta Materialia Hess, P., A., Dauskardt, R., H. 2004; 12 (52): 3525-3533
  • Effect of aqueous solution chemistry on the accelerated cracking of lithographically patterned arrays of copper and nanoporous thin-films MATERIALS, TECHNOLOGY AND RELIABILITY FOR ADVANCED INTERCONNECTS AND LOW-K DIELECTRICS-2004 Guyer, E. P., Dauskardt, R. H. 2004; 812: 303-308
  • Transient fatigue crack-growth behavior and damage zones in Zr-based bulk metallic glass AMORPHOUS AND NANOCRYSTALLINE METALS Hess, P. A., Dauskardt, R. H. 2004; 806: 325-330
  • Debonding under fatigue loading at polymer/inorganic interfaces NANOSCALE MATERIALS AND MODELING-RELATIONS AMONG PROCESSING, MICROSTRUCTURE AND MECHANICAL PROPERTIES Sharratt, B. M., Dauskardt, R. H. 2004; 821: 363-368
  • Special issue on fatigue of advanced materials - Preface MECHANICS OF MATERIALS Soboyejo, W. O., Dauskardt, R., Ritchie, R. O. 2004; 36 (1-2): 1-1
  • Important factors for silane adhesion promoter efficacy: surface coverage, functionality and chain length JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY JENKINS, M. L., Dauskardt, R. H., Bravman, J. C. 2004; 18 (13): 1497-1516
  • Fracture of nanoporous thin-film glasses NATURE MATERIALS Guyer, E. P., Dauskardt, R. H. 2004; 3 (1): 53-57

    Abstract

    Fracture of nanoporous thin-film glasses is a significant challenge for the integration of these mechanically fragile materials in emerging microelectronic and biological technologies. In particular, the integration of these materials has been limited by accelerated cracking rates in moist environments leading to premature failure. Here, we demonstrate how cracking is affected by aqueous solution chemistry, and reveal anomalously high crack-growth rates in hydrogen peroxide solutions frequently encountered during device processing or when in use. Kinetic mechanisms involving the transport and steric hindrance of reactive hydrogen peroxide molecules at the crack tip are proposed. Thin-film design strategies that involve energy dissipation by local plasticity in thin ductile layers on increasing the resistance to cracking of nanoporous glass layers is demonstrated. Understanding how aqueous solutions influence cracking and associated device reliability is a fundamental challenge for these promising materials to be viable candidates for new technologies.

    View details for DOI 10.1038/nmat1037

    View details for Web of Science ID 000187746000016

    View details for PubMedID 14661017

  • Fracture and fatigue behavior of a Zr-Ti-Nb ductile phase reinforced bulk metallic glass matrix composite SCRIPTA MATERIALIA Flores, K. M., Johnson, W. L., Dauskardt, R. H. 2003; 49 (12): 1181-1187
  • Stress wave interference effects during fracture of silicon micromachined specimens EXPERIMENTAL MECHANICS Fitzgerald, A. M., Kenny, T. W., Dauskardt, R. H. 2003; 43 (3): 317-322
  • Temperature dependence of positron annihilation in a Zr-Ti-Ni-Cu-Be bulk metallic glass JOURNAL OF MATERIALS RESEARCH Suh, D., Dauskardt, R. H., Asoka-Kumar, P., Sterne, P. A., Howell, R. H. 2003; 18 (9): 2021-2024
  • Comments on "Mechanical relaxation time scales in a Zr-Ti-Ni-Cu-Be bulk metallic glass" by Daewoong Suh and Reinhold H. Dauskardt [J. Mater. Res. 17, 1254 (2002)] - Reply to the comments of K. Schroter JOURNAL OF MATERIALS RESEARCH Suh, D., Dauskardt, R. H. 2003; 18 (8): 2000-2001
  • Notch strength insensitivity of self-setting hydroxyapatite bone cements JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE Morgan, J. P., Dauskardt, R. H. 2003; 14 (7): 647-653

    Abstract

    The effect of notches on the strength properties of self-setting hydroxyapatite (HA) cements is examined. Such stress concentrators may be present at orthopedic repair sites employing cements and significantly affect their mechanical reliability. Notched tensile specimens were prepared from two cement compositions that resulted in HA and carbonated apatite. The notch radii was varied from 0.15 to 6 mm with a fixed length of 6 mm. The strength of the cements was found to be surprisingly insensitive to the presence of the notches over the range of notch radii examined. A fracture statistics model incorporating a Weibull statistical approach was employed to rationalize the observed notch insensitivity.

    View details for Web of Science ID 000183329700013

    View details for PubMedID 15348429

  • Interface separation in residually-stressed thin-film structures INTERFACE SCIENCE Strohband, S., Dauskardt, R. H. 2003; 11 (3): 309-317
  • Effects of open-volume regions on relaxation time-scales and fracture behavior of a Zr-Ti-Ni-Cu-Be bulk metallic glass Suh, D., Dauskardt, R. H. ELSEVIER SCIENCE BV. 2003: 181-186
  • Fracture nanomechanics - Preface INTERNATIONAL JOURNAL OF FRACTURE Gerberich, W. W., Dauskardt, R. H. 2003; 119 (4-2): VII-VII
  • Effects of Open-Volume Regions on Internal Times Scales and Fracture Behavior of a Zr-Ti-Ni-Cu-Be Bulk Metallic Glass Journal of Non-Crystalline Solids Suh, D., Dauskardt, R., H. 2003; 1-2 (317): 181 – 186
  • Authors’ Reply to the Comment on "Mechanical Relaxation Time Scales in a Zr-Ti-Ni-Cu-Be Bulk Metallic Glass" Journal of Materials Research Suh, D., Dauskardt, R., H. 2003; 8 (18): 2000 – 2001
  • Interfacial Adhesion of Thin-Film Patterned Interconnect Structures Litteken, C., Dauskardt, R., Scherban, T., Xu, G., Leu, J., Gracias, D. 2003
  • Interface Separation in Residually Stressed Thin-Film Structures Interface Science special issue on “Mechanics of Interfaces” Stroband, S., Dauskardt, R., H. 2003; 3 (11): 309-317
  • Fracture Nanomechanics International Journal of Fracture Gerberich, W., W., Dauskardt, R., H. Kluwer Academic Press, Dordrecht, Netherlands. 2003
  • Multi-Scale Simulations Of Interfacial Fracture Of Nanoscale Thin-Film Structures: Effect Of Length Scales and Residual Stresses Stroband, S., Dauskardt, R., H. 2003
  • Effect of CMP Slurry Environments on Subcritical Crack Growth in Ultra Low-k Dielectric Materials Guyer, E., P., Dauskardt, R., H. 2003
  • Effects of Templating Byproducts on Adhesion of Nanoporous Dielectric Films Maidenberg, D., A., Volksen, W., Miller, R., D., Dauskardt, R., H. 2003
  • Stress Wave Interference Effects during Fracture of Silicon Micromachined Specimens Journal of Experimental Mechanics Fitzgerald, A., M., Dauskardt, R., H., Kenny, T., W. 2003; 3 (43): 317 – 322
  • Notch Strength Insensitivity of Self-Setting Hydroxyapatite Bone Cements Journal of Materials Science: Materials in Medicine Morgan, J., P., Dauskardt, R., H. 2003; 14: 647 – 653
  • Temperature Dependence of Positron Annihilation in a Zr-Ti-Ni-Cu-Be Bulk Metallic Glass: Shallow versus Deep Traps Journal of Materials Research Suh, D., Asoka-Kumar, P., Sterne, P., A., Howell, R., H., Dauskardt, R., H. 2003; 9 (18): 2021-2024
  • Interfacial adhesion of thin-film patterned interconnect structures PROCEEDINGS OF THE IEEE 2003 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Litteken, C., Dauskardt, R., Scherban, T., Xu, G., Leu, J., GRACIAS, D., Sun, B. 2003: 168-170
  • Effects of templating byproducts on adhesion of nanoporous dielectric films PROCEEDINGS OF THE IEEE 2003 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Maidenberg, D., Volksen, W., Miller, R., Dauskardt, R. 2003: 48-50
  • Interactions of hydrogen with amorphous nano-structure and their effects on relaxation behavior of Zr-Ti-Ni-Cu-Be bulk metallic glass alloys HYDROGEN EFFECTS ON MATERIAL BEHAVIOR AND CORROSION DEFORMATION INTERACTIONS Suh, D., Dauskardt, R. H. 2003: 183-190
  • Effect of CMP slurry environments on subcritical crack growth in ultra low-k dielectric materials PROCEEDINGS OF THE IEEE 2003 INTERNATIONAL INTERCONNECT TECHNOLOGY CONFERENCE Guyer, E. P., Dauskardt, R. H. 2003: 89-91
  • The effect of atomic-scale open-volume on flow and fracture processes in a Zr-Ti-Ni-Cu-Be bulk metallic glass SUPERCOOLED LIQUIDS, GLASS TRANSITION AND BULK METALLIC GLASSES Suh, D., Dauskardt, R. H. 2003; 754: 249-255
  • Multi-scale simulations of interfacial fracture of nanoscale thin-film structures: Effect of length scales and residual stresses MECHANICAL PROPERTIES DERIVED FROM NANOSTRUCTURING MATERIALS Strohband, S., Dauskardt, R. H. 2003; 778: 303-308
  • Elevated temperature fatigue crack propagation of a Zr-Ti-Cu-Ni-Be bulk metallic glass SUPERCOOLED LIQUIDS, GLASS TRANSITION AND BULK METALLIC GLASSES Hess, P. A., Dauskardt, R. H. 2003; 754: 237-242
  • Effect of moisture and graded-layer mechanical properties on deformation and interfacial adhesion MECHANICAL PROPERTIES DERIVED FROM NANOSTRUCTURING MATERIALS Wang, L. C., Dauskardt, R. H. 2003; 778: 227-232
  • Adhesion of polymer thin-films and patterned lines INTERNATIONAL JOURNAL OF FRACTURE Litteken, C. S., Dauskardt, R. H. 2003; 119 (4-2): 475-485
  • Flow and fracture in Zr-based bulk metallic glasses ANNALES DE CHIMIE-SCIENCE DES MATERIAUX Suh, D., Dauskardt, R. H. 2002; 27 (5): 25-40
  • Opportunities for materials characterization using high-energy positron beams APPLIED SURFACE SCIENCE Asoka-Kumar, P., Howell, R., Nieh, T. G., Sterne, P. A., Wirth, B. D., Dauskardt, R. H., Flores, K. M., Suh, D., ODETTE, G. R. 2002; 194 (1-4): 160-167
  • Mechanical relaxation time scales in a Zr-Ti-Ni-Cu-Be bulk metallic glass JOURNAL OF MATERIALS RESEARCH Suh, D. W., Dauskardt, R. H. 2002; 17 (6): 1254-1257
  • Subcritical debonding of polymer/silica interfaces under monotonic and cyclic loading Snodgrass, J. M., Pantelidis, D., JENKINS, M. L., Bravman, J. C., Dauskardt, R. H. PERGAMON-ELSEVIER SCIENCE LTD. 2002: 2395-2411
  • Characterization of free volume in a bulk metallic glass using positron annihilation spectroscopy JOURNAL OF MATERIALS RESEARCH Flores, K. M., Suh, D., Dauskardt, R. H., Asoka-Kumar, P., Sterne, P. A., Howell, R. H. 2002; 17 (5): 1153-1161
  • Subcritical crack growth in single-crystal silicon using micromachined specimens JOURNAL OF MATERIALS RESEARCH Fitzgerald, A. M., Iyer, R. S., Dauskardt, R. H., Kenny, T. W. 2002; 17 (3): 683-692
  • The effects of hydrogen on viscoelastic relaxation in Zr-Ti-Ni-Cu-Be bulk metallic glasses: implications for hydrogen embrittlement ACTA MATERIALIA Daewoong, S., Asoka-Kumar, P., Dauskardt, R. H. 2002; 50 (3): 537-551
  • Moisture-assisted subcritical debonding of a polymer/metal interface JOURNAL OF APPLIED PHYSICS Kook, S. Y., Dauskardt, R. H. 2002; 91 (3): 1293-1303
  • Adhesion and reliability of underfill/subtrate interfaces in flip chip BGA packages: Metrology and characterization TWENTY SEVENTH ANNUAL IEEE/CPMT/SEMI INTERNATIONAL ELECTRONICS MANUFACTURING TECHNOLOGY SYMPOSIUM Nagarajan, K., Dauskardt, R. H. 2002: 206-214
  • Effect of Composition and Bead Settling on Debonding of Underfill Layers Wang, L., Dauskardt, R., H. 2002
  • Interactions of Hydrogen with Amorphous Nano-Structure and Their Effects on Relaxation Behavior of Zr-Ti-Ni-Cu-Be Bulk Metallic Glass International Conference On Hydrogen Effects on Material Behavior and Corrosion Deformation Interactions, Jackson Lake Lodge Moran Suh, D., Dauskardt, R., H. 2002
  • The Effects of Hydrogen on Viscoelastic Relaxation in Zr-Ti-Ni-Cu-Be Bulk Metallic Glasses: Implications for Hydrogen Enbrittlement Acta Materialia Suh, D., Asoka-Kumar, P., Dauskardt, R., H. 2002; 3 (50): 537-551
  • Characterization of Free Volume in Bulk Metallic Glass Using Positron Annihilation Spectroscopy Journal of Materials Research Flores, K., M., Suh, D., Asoka-Kumar, P., Sterne, P., A., Howell, R., Dauskardt, R., H. 2002; 5 (17): 1153-1161
  • The Effect of Atomic-Scale Open-Volume on Flow and Fracture Processes in a Zr-Ti-Ni-Cu-Be Bulk Metallic Glass Suh, D., Dauskardt, R., H. 2002
  • Mechanical Relaxation Times Scales in a Zr-Ti-Ni-Cu-Be Bulk Metallic Glass Journal of Materials Research Suh, D., Dauskardt, R., H. 2002; 6 (17): 1254-1257
  • Subcritical Crack Growth in Single Crystal Silicon using Micro-Machined Specimens Journal of Materials Research Fitzgerald, A., M., Iyer, R., S., Dauskardt, R., H., Kenny, T., W. 2002; 3 (17): 683-692
  • Moisture-Assisted Debonding of a Polymer/Metal Interface Journal of Applied Physics Kook, S. -Y., Dauskardt, R., H. 2002; 3 (91): 1293-1303
  • Studies of silane adhesion promoters on silica filler particles for use in microelectronic packaging POLYMER INTERFACES AND THIN FILMS Jenkins, M., DeVries, G., Dauskardt, R. H., Bravman, J. C. 2002; 710: 159-164
  • Mechanical and microstructural properties of stratum corneum BIOLOGICAL BIOMIMETIC MATERIALS-PROPERTIES TO FUNCTION Wu, K. S., Van Osd, W. W., Dauskardt, R. H. 2002; 724: 27-33
  • Crack-tip plasticity in bulk metallic glasses Flores, K. M., Dauskardt, R. H. ELSEVIER SCIENCE SA. 2001: 511-515
  • The effects of hydrogen on deformation and fracture of a Zr-Ti-Ni-Cu-Be bulk metallic glass Suh, D., Dauskardt, R. H. ELSEVIER SCIENCE SA. 2001: 480-483
  • Environmental effects on interfacial adhesion Lane, M. W., Snodgrass, J. M., Dauskardt, R. H. PERGAMON-ELSEVIER SCIENCE LTD. 2001: 1615-1624
  • Mean stress effects on flow localization and failure in a bulk metallic glass ACTA MATERIALIA Flores, K. M., Dauskardt, R. H. 2001; 49 (13): 2527-2537
  • Effects of pre-charged hydrogen on the mechanical and thermal behavior of Zr-Ti-Ni-Cu-Be bulk metallic glass alloys Suh, D., Dauskardt, R. H. JAPAN INST METALS. 2001: 638-641
  • Flow and fracture of bulk metallic glass alloys and their composites Flores, K. M., Suh, D., Howell, R., Asoka-Kumar, P., Sterne, P. A., Dauskardt, R. H. JAPAN INST METALS. 2001: 619-622
  • Effects of an adhesion promoter on the debond resistance of a metal-polymethylmethacrylate interface JOURNAL OF BIOMEDICAL MATERIALS RESEARCH Ohashi, K. L., Yerby, S. A., Dauskardt, R. H. 2001; 54 (3): 419-427

    Abstract

    Debonding and premature failure of prostheticpolymethylmethacrylate interfaces have been shown to be exacerbated by exposure to physiological environment. In efforts to counteract these hydrolytic degradation effects, two clinically relevant Co-Cr-Mo surface morphologies were treated with an organosilane adhesion promoter (gamma-methacyloxypropyltrimethoxy) before interface bonding. Samples were quantitatively characterized in terms of the adhesion (fracture) and subcritical debond growth-rate (fatigue) behavior of the interface. The steady-state interface debond resistance, Gss (J/m2), was shown to increase with application of the silane pretreatment both in air (20 degrees C, 45% relative humidity) and simulated physiological environment (37 degrees C, Ringer's). Similarly, positive shifts in the subcritical debond threshold, deltaG(TH), values are observed for silane pretreated interfaces. A shift in the debond path from primarily adhesive failure in untreated surfaces to cohesive failure between the silane layer and bulk polymethylmethacrylate for silane treated surfaces was observed. Silane pretreatment of Co-Cr-Mo surfaces was shown to effectively limit the degree of the environmental degradation. General insights to the effects of surface roughness, chemical enhancement, and the environmental effects on the thermodynamics at the interface and resulting debond behavior are discussed.

    View details for Web of Science ID 000166128200016

    View details for PubMedID 11189050

  • Adhesion of benzocyclobutene-passivated silicon in epoxy layered structures JOURNAL OF MATERIALS RESEARCH Hohlfelder, R. J., Maidenberg, D. A., Dauskardt, R. H., Wei, Y. G., Hutchinson, J. W. 2001; 16 (1): 243-255
  • Studies of Silane Adhesion Promoters on Silica Filler Particles for use in Microelectronic Packaging Jenkins, M., DeVries, G., A., Dauskardt, R., H., Bravman, J., C. 2001
  • The Effects of Hydrogen on Deformation and Fracture of a Zr-Ti-Cu-Ni-Be Bulk Metallic Glass Materials Science and Engineering Suh, D., Dauskardt, R., H. 2001: A319 – 321, 480 – 483
  • The Effects of Pre-Charged Hydrogen on the Mechanical and Thermal Behavior of Zr-Ti-Cu-Ni-Be Bulk Metallic Glass Alloys Materials Transactions, JIM Suh, D., Dauskardt, R., H. 2001; 4 (42): 638-641
  • Adhesion and Debonding of Pressure Sensitive Adhesives Used in Transdermal Drug Delivery Systems Taub, M., Dauskardt, R., H. 2001
  • Adhesion Mechanisms of Silane Adhesion Promoters in Microelectronic Packaging Jenkins, M., Snodgrass, J., Chesterman, A., DeVries, G., Dauskardt, R., H., Bravman, J., C. 2001
  • Fatigue Processes in Single Crystal Silicon MEMS Devices Renuart, E., Fitzgerald, A., M., Kenny, T., W., Dauskardt, R., H. 2001
  • Crack Tip Plasticity in Bulk Metallic Glass Materials Science and Engineering Flores, K., M., Dauskardt, R., H. 2001: A319 - 321, 511 – 515
  • Plasticity contributions to interface adhesion in thin-film interconnect structures JOURNAL OF MATERIALS RESEARCH Lane, M., Dauskardt, R. H., Vainchtein, A., Gao, H. J. 2000; 15 (12): 2758-2769
  • Effects of fatigue loading and PMMA precoating on the adhesion and subcritical debonding of prosthetic-PMMA interfaces JOURNAL OF BIOMEDICAL MATERIALS RESEARCH Ohashi, K. L., Dauskardt, R. H. 2000; 51 (2): 172-183

    Abstract

    Debonding of clinically relevant CoCrMo-polymethylmethacrylate (PMMA) interfaces is shown to occur subcritically under fatigue loading, implying that debonding may occur at loads much lower than those required for catastrophic failure. Interface fracture mechanics samples containing precoated and uncoated grit-blasted CoCrMo substrates and a PMMA layer were constructed and quantitatively evaluated in terms of their critical interface adhesion and subcritical debond behavior. The precoat surfaces had markedly enhanced adhesion and fatigue resistance in both air and simulated physiological environmental conditions compared to the uncoated samples. Constraint of the PMMA layer does not significantly affect the debond process for thickness between 2- and 5-mm. In addition, wear particles were collected and shown to be consistent with particle sizes reported in vivo and are on the scale of the metal surface roughness. Life prediction methods using the subcritical debond-growth data are discussed.

    View details for Web of Science ID 000087329300004

    View details for PubMedID 10825216

  • Fracture toughness and crack growth phenomena of plasma-etched single crystal silicon Fitzgerald, A. M., Dauskardt, R. H., Kenny, T. W. ELSEVIER SCIENCE SA. 2000: 194-199
  • Fracture and subcritical crack-growth behavior of Y-Si-Al-O-N glasses and Si3N4 ceramics JOURNAL OF THE AMERICAN CERAMIC SOCIETY BHATNAGAR, A., Hoffman, M. J., Dauskardt, R. H. 2000; 83 (3): 585-596
  • Hydrogen effects on the mechanical and fracture behavior of a Zr-Ti-Ni-Cu-Be bulk metallic glass SCRIPTA MATERIALIA Suh, D., Dauskardt, R. H. 2000; 42 (3): 233-240
  • Adhesion and reliability of copper interconnects with Ta and TaN barrier layers JOURNAL OF MATERIALS RESEARCH Lane, M., Dauskardt, R. H., Krishna, N., Hashim, I. 2000; 15 (1): 203-211
  • Flow and Fracture of Bulk Metallic Glass Alloys and Their Composites Flores, K., M., Suh, D., Howell, R., Asoka-Kumar, P., Sterne, P., A., Dauskardt, R., H. 2000
  • Adhesion of Benzocyclobutine-Passivated Silicon in Epoxy Layered Structures Journal of Materials Research Hohlfelder, R., J., Maidenberg, D., A., Dauskardt, R., H., Wei, Y., Hutchinson, J., W. 2000; 1 (16): 243-255
  • The effect of Fatigue on The Adhesion and Subcritical Debonding of Benzocyclobutene/Silicon Dioxide Interfaces Snodgrass, J., Dauskardt, R., H. 2000
  • Chemical and Structural Characterization of Silane Adhesion Promoting Films for Use in Microelectronic Packaging Jenkins, M., Snodgrass, J., Dauskardt, R., H., Bravman, J., C. 2000
  • Effects of an Adhesion Promoter on the Debond Resistance of a Metal-PMMA Interface Journal of Biomedical Materials Research Ohashi, K., L., Yerby, S., A., Dauskardt, R., H. 2000; 12: 419-427
  • Adhesion and Reliability of Underfill/Substrate interfaces in Microelectronic Packages: Metrology and Characterization SRC Consortium Meeting, Albany, New York Nagarajan, K., Dauskardt, R., H. 2000
  • Hydrogen Effects on the Mechanical and Fracture Behavior of a Zr-Ti-Cu-Ni-Be Bulk Metallic Glass Scripta Materialia Suh, D., Dauskardt, R., H. 2000; 3 (42): 233-240
  • Fracture and Subcritical Crack-Growth Behavior of Y-Si-Al-O-N Glasses and Si3N4 Ceramics Journal of the American Ceramics Society Bhatnagar, A., Hoffmann, M., J., Dauskardt, R., H. 2000; 3 (83): 585-596
  • Atomic Force Microscopy Studies of Fracture Surfaces from Oxide/Polymer Interfaces Jenkins, M., Snodgrass, J., Chesterman, A., Dauskardt, R., H., Bravman, J., C. 2000
  • Adhesion of Pressure Sensitive Adhesives with Application in Transdermal Drug Delivery Taub, M., Dauskardt, R., H. 2000
  • Adhesion and Reliability of Methylsilsesquioxane Dielectric Materials Maidenberg, D., A., Volksen, W., Miller, R., D., Dauskardt, R., H. 2000
  • Short Range Chemical Ordering in Bulk Metallic Glasses Dauskardt, R., H., Sterne, P., A., Asoka-Kumar, P., Hartley, J., H., Howell, R., H., Nieh, T., G. 2000
  • Hydrogen Embrittlement in a Zr-Ti-Cu-Ni-Be Bulk Metallic Glass Suh, D., Dauskardt, R., H. 2000
  • Effects of Fatigue Loading and PMMA Precoating on the Adhesion and Subcritical Debonding of Prosthetic/PMMA Interfaces Journal of Biomedical Materials Research Ohashi, K., L., Dauskardt, R., H. 2000; 51: 172-183
  • Strength, Toughness and Fatigue of an Apatite Cement Jew, V., Morgan, J., P., Dauskardt, R., H. 2000
  • Fatigue and environmental effects on subcritical debonding of polymer interfaces PROCEEDINGS OF THE SEM IX INTERNATIONAL CONGRESS ON EXPERIMENTAL MECHANICS Snodgrass, J. M., Dauskardt, R. H. 2000: 900-903
  • Study of crack propagation at an oxide/polymer interface under varying loading conditions THIN FILMS-STRESSES AND MECHANICAL PROPERTIES VIII Pantelidis, D., Snodgrass, J., Dauskardt, R. H., Bravman, J. C. 2000; 594: 407-412
  • High-resolution measurement of crack growth in micro-machined single crystal silicon MATERIALS SCIENCE OF MICROELECTROMECHANICAL SYSTEMS (MEMS) DEVICES II Fitzgerald, A. M., Dauskardt, R. H., Kenny, T. W. 2000; 605: 43-48
  • Adhesion and mechanical reliability of microelectronic devices and their packages PROCEEDINGS OF THE SEM IX INTERNATIONAL CONGRESS ON EXPERIMENTAL MECHANICS Dauskardt, R. H. 2000: 888-888
  • Enhanced toughness due to stable crack tip damage zones in bulk metallic glass SCRIPTA MATERIALIA Flores, K. M., Dauskardt, R. H. 1999; 41 (9): 937-943
  • Fatigue crack-growth behavior of materials in viscous fluid environments JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS Yi, K. S., Cox, B. N., Dauskardt, R. H. 1999; 47 (9): 1843-1871
  • Local heating associated with crack tip plasticity in Zr-Ti-Ni-Cu-Be bulk amorphous metals JOURNAL OF MATERIALS RESEARCH Flores, K. M., Dauskardt, R. H. 1999; 14 (3): 638-643
  • Subcritical debonding of multilayer interconnect structures: Temperature and humidity effects MATERIALS RELIABILITY IN MICROELECTRONICS IX Lane, M., Dauskardt, R., Ma, Q., Fujimoto, H., Krishna, N. 1999; 563: 251-256
  • Subcritical Debonding of Multilayer Interconnect Structures: Temperature and Humidity Effects Lane, M., Dauskardt, R., H., Ma, Q., Fujimoto, H., Krishna, N. 1999
  • The Effect of Environment and Fatigue on the Adhesion and Subcritical Debonding of Dielectric Polymers Snodgrass, J., M., Pantelidis, D., Bravman, J., C., Dauskardt, R., H. 1999
  • Environmental and Stress State Effects on Fracture and Fatigue Crack-Growth in Zr-Ti-Ni-Cu-Be Bulk Amorphous Metals Flores, K., M., Suh, D., Dauskardt, R., H. edited by Inoue, A., Johnson, W., Liu, C., T. 1999
  • Study of Crack Propagation at an Oxide/Polymer Interface under Varying Loading Conditions Pantelidis, D., Snodgrass, J., Dauskardt, R., H., Bravman, J., C. 1999
  • Fracture Toughness of Plasma-Etched Single Crystal Silicon and Implications for MEMS Design in Symposium on Microelectromechanical Systems, Transducers 99 10th International Conference on Solid-State Sensors and Actuators, Sendai Fitzgerald, A., M., Dauskardt, R., H., Kenny, T., W. 1999: 928-931
  • High-resolution measurement of crack growth in micromachined single crystal silicon Fitzgerald, A., M., Dauskardt, R., H., Kenny, T., W. 1999
  • Adhesion and Progressive Debonding of Polymer/Metal Interfaces: Effects of Temperature and Environment Kook, S.-Y., Kirtikar, A., Dauskardt, R., H. 1999
  • Effect of Nitrogen on Adhesion of the Ta/SiO2 Interface Lane, M., Krishna, N., Hashim, I., Dauskardt, R., H. 1999
  • Fracture Toughness of Plasma-Etched Single Crystal Silicon and Implications for MEMS Design in Symposium on Microelectromechanical Systems, Transducers 99 10th International Conference on Solid-State Sensors and Actuators Fitzgerald, A., M., Dauskardt, R., H., Kenny, T., W. 1999: 928-931
  • The effects of environment and fatigue on the adhesion and subcritical debonding of dielectric polymers LOW-DIELECTRIC CONSTANT MATERIALS V Snodgrass, J. M., Pantelidis, D., Bravman, J. C., Dauskardt, R. H. 1999; 565: 123-128
  • Effect of nitrogen content on interfacial adhesion of the Ta/SiO2 interface ADVANCED INTERCONNECTS AND CONTACTS Lane, M., Dauskardt, R., Krishna, N., Hashim, I. 1999; 564: 281-286
  • Reliability of electroless processed thin layered solder joints MATERIALS RELIABILITY IN MICROELECTRONICS IX Wang, L. C., Mei, Z., Dauskardt, R. H. 1999; 563: 3-8
  • Adhesion and progressive debonding of polymer/metal interfaces: Effects of temperature and environment MATERIALS RELIABILITY IN MICROELECTRONICS IX Kook, S. Y., Kirtikar, A., Dauskardt, R. H. 1999; 563: 263-268
  • Subcritical growth of microstructurally small cracks in silicon nitride ceramics SMALL FATIGUE CRACKS: MECHANICS, MECHANISMS, AND APPLICATIONS Haubensak, F. G., BHATNAGAR, A., Dauskardt, R. H. 1999: 271-282
  • Environmental and stress state effects on fracture and fatigue crack-growth in Zr-Ti-Ni-Cu-Be bulk amorphous metals BULK METALLIC GLASSES Flores, K. M., Suh, D. W., Dauskardt, R. H. 1999; 554: 355-360
  • Adhesion and reliability of polymer/inorganic interfaces JOURNAL OF ELECTRONIC PACKAGING Kook, S. Y., Snodgrass, J. M., Kirtikar, A., Dauskardt, R. H. 1998; 120 (4): 328-335
  • Adhesion and reliability of interfaces in cemented total joint arthroplasties JOURNAL OF ORTHOPAEDIC RESEARCH Ohashi, K. L., Romero, A. C., McGowan, P. D., Maloney, W. J., Dauskardt, R. H. 1998; 16 (6): 705-714

    Abstract

    Debonding of the prosthetic/polymethylmethacrylate interface has been implicated in the initial failure process of cemented total hip arthroplasties. However, little quantitative understanding of the debonding process, as well as of the optimum interface morphology for enhanced resistance to debonding, exists. Accordingly, a fracture-mechanics approach has been used in which adhesion at the interface is characterized in terms of the interface fracture energy, G (J/m2), and shown to be a strong function of the morphology, debonding length, and loading mode of the interface. Double-cantilever-beam and four-point-flexure fracture-mechanics samples containing four clinically relevant prosthetic surface preparations were prepared to survey a range of interface roughness and loading modes. Adhesion at the interface could not be characterized with a single-valued material property but was found to exhibit resistance-curve behavior in which resistance to debonding increased with both the initial debond extension and the roughness of the interface. Values of debonding initiation, Go, were relatively insensitive to the roughness of the surface and the loading mode, whereas steady-state fracture resistance of the interface, Gss, increased significantly with the roughness and shear loading of the interface. These quantitative results suggest that debonding of the prosthetic/polymethylmethacrylate interface may be primarily attributed to surface interactions such as interlocking and the pullout of rough asperities that occur behind the debond tip. A simple mechanics analysis of such interactions was performed and revealed increases in the fracture resistance of the interface that were consistent with experimentally measured values.

    View details for Web of Science ID 000077786300011

    View details for PubMedID 9877395

  • Adhesion and debonding of multi-layer thin film structures Dauskardt, R., Lane, M., Ma, Q., Krishna, N. PERGAMON-ELSEVIER SCIENCE LTD. 1998: 141-162
  • Debonding of interfaces in multilayer interconnect structures ADVANCED INTERCONNECTS AND CONTACT MATERIALS AND PROCESSES FOR FUTURE INTEGRATED CIRCUITS Lane, M., Ni, W., Dauskardt, R. H. 1998; 514: 141-141
  • Adhesion and Progressive Debonding of Polymer/Metal Interfaces in Microelectronic Applications Kook, S., -Y., Kirtikar, A., Dauskardt, R., H. 1998
  • Effect of a Photochemically Activated Adhesion Promoter on the Adhesion of PMMA/Si Interfaces Lin, J., Snodgress, J., M., Dauskardt, R, H. 1998
  • Subcritical Crack-Growth Behavior in Materials Under Cyclic Loads: Effect of Hydrodynamic Pressure Created by Viscous Environments Journal of the Mechanics and Physics of Solids Yi, K., S., Cox, B., N., Dauskardt, R., H. 1998; 9 (47): 1843-1871
  • Effects of Interface Nonplanarity on the Interface Fracture Energy on the TiN/SiO2 System Lane, M., Ni, W., Dauskardt, R., H., Ma, Q., Fujimoto, H., Krishna, N. 1998
  • Quantitative Assessment of Interface Fracture at Bone Cement/Metal Prosthetic Interfaces in Total Hip Arthroplasties Journal of Orthopedic Research Ohashi, K., L., Romero, A., C., McGrowan, P., W., Maloney, W., J., Dauskardt, R., H. 1998; 6 (16): 705-714
  • Adhesion and Subcritical Debonding of Interfaces for Die Attach Applications Snodgrass, J., M., Dauskardt, R., H. 1998
  • Fracture and Sub-Critical Crack Growth Behavior of Micromachined Single Crystal Silicon Structures in Symposium on Microelectromechanical Systems, 1998 ASME International Mechanical Engineering Congress &Exopsition Fitzgerald, A., M., Iyer, R., Suryanarayanan, Dauskardt, R., H., Kenny, T., W. 1998: 395-399
  • Adhesion and subcritical debonding of polymer interfaces for microelectronic packaging ELECTRONIC PACKAGING MATERIALS SCIENCE X Snodgrass, J. M., Hotchkiss, G., Dauskardt, R. H. 1998; 515: 37-43
  • Effects of interface nonplanarity on the interface fracture energy of the TiN/SiO2 system THIN-FILMS - STRESSES AND MECHANICAL PROPERTIES VII Lane, M., Ni, W., Dauskardt, R., Ma, Q., Fujimoto, H., Krishna, N. 1998; 505: 357-362
  • Observations of low cycle fatigue of Al thin films for MEMS applications MICROELECTROMECHANICAL STRUCTURES FOR MATERIALS RESEARCH Cornella, G., Vinci, R. P., Iyer, R. S., Dauskardt, R. H., Bravman, J. C. 1998; 518: 81-86
  • New adhesion measurement technique for coated cutting tool materials INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS Mroz, J., Dauskardt, R. H., Schleinkofer, U. 1998; 16 (4-6): 395-402
  • Mechanical properties of carbonated apatite bone mineral substitute: strength, fracture and fatigue behaviour JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE Morgan, E. F., Yetkinler, D. N., Constantz, B. R., Dauskardt, R. H. 1997; 8 (9): 559-570

    Abstract

    The synthesis and properties of carbonated apatite materials have received considerable attention due to their importance for medical and dental applications. Such apatites closely resemble the mineral phase of bone, exhibiting superior osteoconductive and osteogenic properties. When formed at physiological temperature they present significant potential for bone repair and fracture fixation. The present study investigates the mechanical properties of a carbonated apatite cancellous bone cement. Flexural strength was measured in three and four point bending, and the fracture toughness and fatigue crack-growth behaviour was measured using chevron and disc-shaped compact tension specimens. The average flexural strength was found to be approximately 0.468 MPa, and the fracture toughness was approximately 0.14 MPa radical m. Fatigue crack-growth rates exhibited a power law dependence on the applied stress intensity range with a crack growth exponent m=17. The fatigue threshold value was found to be approximately 0.085 MPa radical m. The mechanical properties exhibited by the carbonated apatite were found to be similar to those of other brittle cellular foams. Toughness values and fatigue crack-growth thresholds were compared to other brittle foams, bone and ceramic materials. Implications for structural integrity and longer term reliability are discussed.

    View details for Web of Science ID A1997XV77100006

    View details for PubMedID 15348708

  • Reliability of PMMA bone cement fixation: fracture and fatigue crack-growth behaviour JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE Nguyen, N. C., Maloney, W. J., Dauskardt, R. H. 1997; 8 (8): 473-483

    Abstract

    Fracture mechanics tests were performed to characterize the fracture toughness and fatigue crack-growth behaviour of polymethylmethacrylate (PMMA) bone cement, commonly used in joint replacement surgery. Compact tension specimens of various thicknesses were prepared and tested in both air and Ringer's solution. Contrary to previous reports citing toughness as a single valued parameter, the PMMA was found to exhibit resistance-curve behaviour with a plateau toughness of approximately 0.6 MPa m1/2 in air, and approximately 2.0 MPa m1/2 in Ringer's solution. The increased toughness in Ringer's solution is thought to arise from the plasticizing effect of the environment. Under cyclic loads, the material displayed true mechanical fatigue failure in both environments; fatigue crack-growth rates, da/dN, were measured over the range approximately 10(-10) to 10(-6) m/cycle and found to display a power-law dependence on the stress intensity range, DeltaK. The cement was found to be more resistant to fatigue-crack propagation in Ringer's solution than in air. Wear debris was observed on the fatigue fracture surfaces, particularly those produced in air. These findings and the validity of using a linear-elastic fracture mechanics approach for viscoelastic materials are discussed in the context of providing more reliable and fracture-resistant cemented joints.

    View details for Web of Science ID A1997XQ16600003

    View details for PubMedID 15348713

  • Subcritical crack growth in glasses under cyclic loads: Effect of hydrodynamic pressure in aqueous environments ACTA MATERIALIA Yi, K. S., Dill, S. J., Dauskardt, R. H. 1997; 45 (7): 2671-2684
  • Fracture and fatigue crack-growth behavior of single crystal NiAl SCRIPTA MATERIALIA Flores, K. M., Dauskardt, R. H. 1997; 36 (12): 1377-1382
  • Subcritical crack-growth behavior of borosilicate glass under cyclic loads: Evidence of a mechanical fatigue effect JOURNAL OF THE AMERICAN CERAMIC SOCIETY Dill, S. J., Bennison, S. J., Dauskardt, R. H. 1997; 80 (3): 773-776
  • Microstructural mechanisms of cyclic fatigue-crack propagation in grain-bridging ceramics CERAMICS INTERNATIONAL Gilbert, C. J., Dauskardt, R. H., Ritchie, R. O. 1997; 23 (5): 413-418
  • Adhesion measurement of interfaces in multilayer interconnect structures MATERIALS RELIABILITY IN MICROELECTRONICS VII Ma, Q., Bumgarner, J., Fujimoto, H., Lane, M., Dauskardt, R. H. 1997; 473: 3-14
  • Subcritical Crack-Growth Behavior in Glasses and Ceramics: Effect of Hydrodynamic Pressures in Aqueous Environments Acta Metallurgicaet Materialia Yi, K., S., Dill, S., J., Dauskardt, R., H. 1997; 7 (45): 2671-2684
  • Subcritical Crack-Growth Behavior of Borosilicate Glass under Cyclic Loads: Evidence of a Mechanical Fatigue Effect Journal of the American Ceramics Society Dill, S., J., Bennison, S., J., Dauskardt, R., H. 1997; 3 (80): 773-76
  • Microstructural Mechanisms of Cyclic Fatigue-Crack Propagation in Grain Bridging Ceramics Ceramics International Gilbert, C., J., Dauskardt, R., H., Ritchie, R., O. 1997; 23: 413-418
  • Mechanical Properties of Carbonated Hydroxyapatite Bone Mineral Substitute: Strength, Fracture and Fatigue Behavior Journal of Materials Science: Materials in Medicine Morgan, E., Yetkinler, D., N, Constantz, B., R, Dauskardt, R., H 1997; 9 (8): 559-570
  • Adhesion Measurement of Interfaces in Multilayer Interconnect Structures Ma, Q., Bumgarner, J., Fujimoto, H., Lane, M., Dauskardt, R., H. 1997
  • Reliability of PMMA Bone Cement Fixation: Fracture and Fatigue Crack-Growth Behavior Journal of Materials Science: Materials in Medicine Nguyen, N., C., Maloney, W., J., Dauskardt, R., H. 1997; 8 (8): 473-483
  • Adhesion and Reliability of Polymer/Inorganic Interfaces in Microelectronic Applications Snodgrass, J., M., Kook, S., -Y., Kirtikar, A., Dauskardt, R., H. 1997
  • Adhesion and progressive delamination of polymer/metal interfaces HIGH CYCLE FATIGUE OF STRUCTURAL MATERIALS Dauskardt, R. H., Kook, S. Y., Kirtikar, A., Ohashi, K. L. 1997: 479-498
  • Quantitative stress mapping in alumina composites by optical fluorescence imaging ACTA MATERIALIA Dauskardt, R. H., Ager, J. W. 1996; 44 (2): 625-641
  • Adhesion and Reliability of Interfaces in Cemented Total Joint Arthroplasties Ohashi, K., L., Romero, A., C., McGowan, P., D., Maloney, W., J., Dauskardt, R., H. 1996
  • BEHAVIOR OF CYCLIC FATIGUE CRACKS IN MONOLITHIC SILICON-NITRIDE JOURNAL OF THE AMERICAN CERAMIC SOCIETY Gilbert, C. J., Dauskardt, R. H., Ritchie, R. O. 1995; 78 (9): 2291-2300
  • FRACTURE OF SYNTHETIC DIAMOND JOURNAL OF APPLIED PHYSICS DRORY, M. D., Dauskardt, R. H., Kant, A., Ritchie, R. O. 1995; 78 (5): 3083-3088
  • GRAIN-SIZE EFFECTS ON CYCLIC FATIGUE AND CRACK-GROWTH RESISTANCE BEHAVIOR OF PARTIALLY-STABILIZED ZIRCONIA JOURNAL OF MATERIALS SCIENCE Hoffman, M. J., Mai, Y. W., Dauskardt, R. H., Ager, J., Ritchie, R. O. 1995; 30 (13): 3291-3299
  • MICROSTRUCTURAL DAMAGE AND FRACTURE PROCESSES IN A COMPOSITE SOLID ROCKET PROPELLANT JOURNAL OF SPACECRAFT AND ROCKETS BENCHER, C. D., Dauskardt, R. H., Ritchie, R. O. 1995; 32 (2): 328-334
  • CYCLIC FATIGUE IN MONOLITHIC ALUMINA - MECHANISMS FOR CRACK ADVANCE PROMOTED BY FRICTIONAL WEAR OF GRAIN BRIDGES JOURNAL OF MATERIALS SCIENCE Gilbert, C. J., PETRANY, R. N., Ritchie, R. O., Dauskardt, R. H., Steinbrech, R. W. 1995; 30 (3): 643-654
  • Fracture of Synthetic Diamond Journal of Applied Physics Drory, M., D., Dauskardt, R., H., Kant, A., Ritchie, R., O. 1995; 5 (78): 3083-88
  • Fracture, fatigue and indentation behavior of pyrolytic carbon for biomedical applications MECHANICAL BEHAVIOR OF DIAMOND AND OTHER FORMS OF CARBON Ritchie, R. O., Dauskardt, R. H., Gerberich, W. W., Strojny, A., Lilleodden, E. 1995; 383: 229-254
  • Growth and characterization of FePt compound thin films MAGNETIC ULTRATHIN FILMS, MULTILAYERS AND SURFACES Visokay, M. R., Sinclair, R. 1995; 384: 91-96
  • Grain Size Effects on Cyclic Fatigue and Crack-Growth Resistance Behavior of Partially Stabilized Zirconia Journal of Materials Science Hoffman, M., J., Mai, Y., W., Dauskardt, R., H., Ager, J., Ritchie, R., O. 1995; 30: 3291-99
  • Quantitative Measurement of Interface Fracture Energy in Multi-Layer Thin Film Structures Dauskardt, R., H., Ma, Q., Fujimoto, H., Flinn, P., Jain, V., Adibi-Rizi, F. 1995
  • Microstructural Mechanisms of Cyclic Fatigue-Crack Propagation in Grain Bridging Ceramics Gilbert, C., J., Dauskardt, R., H., Ritchie, R., O. 1995
  • Mechanics and Mechanisms of Crack Growth At on Near Interfaces in Cemented Load Bearing Prosthetics, Dauskardt, R., H., Nguyen, N., Christine, Maloney, W., J. 1995
  • Cyclic Fatigue in Monolithic Alumina: Mechanisms for Crack Advance Promoted by Frictional Wear of Grain Bridges Journal of Materials Science Gilbert, C., J., Petrany, R., N., Dauskardt, R., H., Steinbrech, R., W., Ritchie, R., O. 1995; 30: 643-54
  • Cyclic Fatigue and Fracture in Pyrolytic Carbon-Coated Graphite Mechanical Heart-Valve Prostheses: Role of Small Cracks in Life Prediction Journal of Biomechanical Materials Research Dauskardt, R., H., Ritchie, R., O., Takemoto, J., K., Brendzel, A., M. 1995; 5 (29): 676-678
  • Microstructural Damage and Fracture Processes in a Composite Solid Rocket Propellant Journal of Spacecrafts and Rockets Bencher, C., D., Dauskardt, R., H., Ritchie, R., O. 1995; 2 (32): 328-34
  • Behavior of Cyclic Fatigue Cracks in Monolithic Silicon Nitride Journal of the American Ceramics Society Gilbert, C., J., Dauskardt, R., H., Ritchie, R., O. 1995; 9 (78): 2291-300
  • CYCLIC FATIGUE BEHAVIOR AND FRACTURE-TOUGHNESS OF SILICON-NITRIDE CERAMICS SINTERED WITH RARE-EARTH-OXIDES ACTA METALLURGICA ET MATERIALIA CORNELISSEN, B. E., Dauskardt, R. H., Ritchie, R. O., Thomas, G. 1994; 42 (9): 3055-3064
  • CYCLIC FATIGUE AND FRACTURE IN PYROLYTIC CARBON-COATED GRAPHITE MECHANICAL HEART-VALVE PROSTHESES - ROLE OF SMALL CRACKS IN LIFE PREDICTION JOURNAL OF BIOMEDICAL MATERIALS RESEARCH Dauskardt, R. H., Ritchie, R. O., TAKEMOTO, J. K., Brendzel, A. M. 1994; 28 (7): 791-804

    Abstract

    A fracture-mechanics based study has performed to characterize the fracture toughness and rates of cyclic fatigue-crack growth of incipient flaws in prosthetic heart-valve components made of pyrolytic carbon-coated graphite. Such data are required to predict the safe structural lifetime of mechanical heart-valve prostheses using damage-tolerant analysis. Unlike previous studies where fatigue-crack propagation data were obtained using through-thickness, long cracks (approximately 2-20 mm long), growing in conventional (e.g., compact-tension) samples, experiments were performed on physically small cracks (approximately 100-600 microns long), initiated on the surface of the pyrolytic-carbon coating to simulate reality. Small-crack toughness results were found to agree closely with those measured conventionally with long cracks. However, similar to well-known observations in metal fatigue, it was found that based on the usual computations of the applied (far-field) driving force in terms of the maximum stress intensity, Kmax, small fatigue cracks grew at rates that exceeded those of long cracks at the same applied stress intensity, and displayed a negative dependency on Kmax; moreover, they grew at applied stress intensities less than the fatigue threshold value, below which long cracks are presumed dormant. To resolve this apparent discrepancy, it is shown that long and small crack results can be normalized, provided growth rates are characterized in terms of the total (near-tip) stress intensity (incorporating, for example, the effect of residual stress); with this achieved, in principle, either form of data can be used for life prediction of implant devices. Inspection of the long and small crack results reveals extensive scatter inherent in both forms of growth-rate data for the pyrolytic-carbon material.

    View details for Web of Science ID A1994NR13500005

    View details for PubMedID 8083247

  • FATIGUE-CRACK PROPAGATION BEHAVIOR IN MONOLITHIC AND COMPOSITE CERAMICS AND INTERMETALLICS MATERIALS SCIENCE Ritchie, R. O., Dauskardt, R. H., Rao, K. T. 1994; 30 (3): 277-300
  • BACK-FACE STRAIN COMPLIANCE AND ELECTRICAL-POTENTIAL CRACK LENGTH CALIBRATIONS FOR THE DISK-SHAPED COMPACT-TENSION DC(T) SPECIMEN JOURNAL OF TESTING AND EVALUATION Gilbert, C. J., McNaney, J. M., Dauskardt, R. H., Ritchie, R. O. 1994; 22 (2): 117-120
  • High temperature fatigue-crack growth experiments in ceramics and ceramic-matrix composites Dauskardt, R. H., Mitchell, M. R. SOC EXPERIMENTAL MECHANICS INC. 1994: 685-690
  • ON THE STRENGTH AND TOUGHNESS OF STRUCTURAL CERAMICS BONDED TO METALS ADVANCED MATERIALS '93, I - A & B Ritchie, R. O., Cannon, R. M., Dalgleish, B. J., Dauskardt, R. H., McNaney, J. M. 1994; 14 (A-B): 409-412
  • FATIGUE-CRACK PROPAGATION BEHAVIOR IN MONOLITHIC AND COMPOSITE CERAMICS AND INTERMETALLICS ADVANCES IN FRACTURE RESISTANCE AND STRUCTURAL INTEGRITY Ritchie, R. O., Dauskardt, R. H., Rao, K. T. 1994: 277-317
  • FATIGUE-CRACK PROPAGATION BEHAVIOR IN CERAMIC MATERIALS ADVANCED MATERIALS '93, I - A & B Ritchie, R. O., Dauskardt, R. H. 1994; 14 (A-B): 359-364
  • Fatigue-Crack Propagation Behavior in Monolithic and Composite Ceramics and Intermetallics Materials Science Ritchie, R., O., Dauskardt, R., H., Rao, K., T. Venkateswara 1994; 3 (30): 277-300
  • Fatigue-Crack Propagation Behavior in Monolithic and Composite Ceramics and Intermetallics Ritchie, R., O., Dauskardt, R., H., Rao, K., T. Venkateswara 1994
  • Cyclic Fatigue Behavior and Fracture Toughness of Silicon Nitride Sintered With Rare-Earth Oxides Acta Metallurgica et Materialia Cornelissen, B., E., Dauskardt, R., H., Ritchie, R., O., Thomas, G. 1994; 9 (42): 3055-3064
  • Cyclic Fatigue-Crack Growth in Si3N4 Ceramics Tailoring of High Temperature Properties of Si3N4 Ceramics Dauskardt, R., H. Kluwer Academic Publishers, Dordrecht. 1994: 365-378
  • Fatigue-Crack Propagation Behavior in Monolithic and Composite Ceramics and Intermetallics Ritchie, R., O., Dauskardt, R., H., Rao, K., T. Venkateswara edited by Panasyuk, V., V., Rao, P., Pama, Taplin, D., M. R. 1994
  • Back-Face Strain Compliance and Electrical-Potential Crack Length Calibrations for the Disk-Shaped Compact-Tension DC(T) Specimen Journal of Testing and Evaluation Gilbert, C., J., McNaney, J., M., Dauskardt, R., H., Ritchie, R., O. 1994; 3: 117-120
  • Fatigue-Crack Propagation Behavior in Ceramic Materials. Transactions of the Materials Research Society of Japan Ritchie, R., O., Dauskardt, R., H. 1994; 14A: 359-364
  • Crack Path and Fracture Energies in Ceramic-Metal Sandwich Geometries Journal of the American Ceramic Society Cannon, R., M., Dalgleish, B., J., Dauskardt, R., H., McNaney, J., M., Ritchie, R., O. 1994; 76
  • On the Strength and Toughness of Structural Ceramics Bonded to Metals Transactions of the Materials Research Society of Japan Ritchie, R., O., Cannon, R., M., Dalgleish, B., J., Dauskardt, R., H., McNaney, J., M. 1994; 14A: 409-412
  • High Temperature Fatigue-Crack Growth Experiments in Ceramics and Ceramic-Matrix Composites Dauskardt, R., H., Mitchell, M., R. 1994
  • CYCLIC FATIGUE-CRACK GROWTH IN SI3N4-CERAMICS Dauskardt, R. H. SPRINGER. 1994: 365-378
  • FATIGUE OF ADVANCED MATERIALS .2. ADVANCED MATERIALS & PROCESSES Dauskardt, R. H., Ritchie, R. O., Cox, B. N. 1993; 144 (2): 30-35
  • MECHANICS AND MECHANISMS OF CRACK-GROWTH AT OR NEAR CERAMIC-METAL INTERFACES - INTERFACE ENGINEERING STRATEGIES FOR PROMOTING TOUGHNESS MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Ritchie, R. O., Cannon, R. M., Dalgleish, B. J., Dauskardt, R. H., McNaney, J. M. 1993; 166 (1-2): 221-235
  • FATIGUE OF ADVANCED MATERIALS .1. ADVANCED MATERIALS & PROCESSES Dauskardt, R. H., Ritchie, R. O., Cox, B. N. 1993; 144 (1): 26-?
  • CYCLIC FATIGUE-CRACK PROPAGATION IN A SILICON-CARBIDE WHISKER-REINFORCED ALUMINA COMPOSITE - ROLE OF LOAD RATIO JOURNAL OF MATERIALS SCIENCE Dauskardt, R. H., Dalgleish, B. J., Yao, D., Ritchie, R. O., Becher, P. F. 1993; 28 (12): 3258-3266
  • Cyclic Fatigue-Crack Growth in Grain Bridging Ceramics Engineering Materials and Technology Dauskardt, R., H. 1993; 115: 244-251
  • FATIGUE-CRACK PROPAGATION IN ADVANCED MATERIALS FATIGUE 93, VOLS 1-3 Ritchie, R. O., Venkateswara, K. T., Dauskardt, R. H. 1993: 1899-1918
  • ROLE OF SMALL CRACKS IN THE STRUCTURAL INTEGRITY OF PYROLYTIC CARBON HEART-VALVE PROSTHESES BIOCERAMICS, VOL 6 Dauskardt, R. H., Ritchie, R. O., Brendzel, A. M. 1993: 229-236
  • Matrix and Interfacial Fatigue-Crack Growth in Advanced Structural Materials Ritchie, R., O., Dauskardt, R., H., Rao, K, T. Venkateswara 1993
  • Effect of Encapsulation Processing on Toughness and Crack Growth Behavior of Silicon Carbide/Polymethacrylate Particulate Composites Journal of Material Science Sheu, C., Dauskardt, R., H., Jonghe, L., C. De 1993; 28: 2196-2206
  • Fatigue-Crack Propagation in Advanced Materials Ritchie, R., O., Rao, K., T. Venkateswara, Dauskardt, R., H. edited by Bailon, J. -P., Dickson, J., I. 1993
  • Cyclic Fatigue-Crack Propagation in a Silicon Carbide Whisker-Reinforced Alumina Composite: Role of Load Ratio Journal of Materials Science Dauskardt, R., H., Dalgleish, B., J., Yao, D., Ritchie, R., O., Becher, P., F. 1993; 28: 3258-3266
  • A Frictional-Wear Mechanism For Fatigue-Crack Growth in Grain Bridging Ceramics Acta Metallurgicaet Materialia Dauskardt, R., H. 1993; 9 (41): 2765-2781
  • Fracture and Fatigue-Crack Propagation Behavior in High-Temperature Ceramics and Intermetallics Ritchie, R., O., Rao, K., T. Venkateswara, Dauskardt, R., H. edited by Kishi, T., Takada, N., Kagawa, Y. 1993
  • Pyrolytic Carbon Coatings An Introduction to Bioceramics Dauskardt, R., H., Ritchie, R., O. World Scientific Publishing Co.. 1993: 261-279
  • Fatigue of Advanced Materials: Part II Advanced Materials and Processes Dauskardt, R., H., Ritchie, R., O., Cox, B., N. 1993; 8 (144): 30-35
  • Mechanics and Mechanisms of Crack Growth at or near Ceramic-Metal Interfaces: Interface Engineering Strategies for Promoting Toughness Materials Science and Engineering A Ritchie, R., O., Cannon, R., M., Dalgleish, B., J., Dauskardt, R., H., McNaney, J., M. 1993; A166: 221-235
  • Role of Small Cracks in the Structural Integrity of Pyrolytic Carbon Heart-Valve Prostheses Dauskardt, R., H., Ritchie, R., O., Brendzel, A., M. edited by Ducheyne, P., Christiansen, D. 1993
  • A Review of the Mechanics and Mechanisms of Cyclic Fatigue-Crack Propagation in Transformation-Toughened Zirconia Ceramics Hoffman, M., J., Dauskardt, R., H., Mai, Y. -W., Ritchie, R., O. edited by Badwal, S., P. S., Bannister, M., J., Hannink, R., H. J. 1993
  • Fatigue of Advanced Materials: Part I Advanced Materials and Processes Dauskardt, R., H., Ritchie, R., O., Cox, B., N. 1993; 7 (144): 26-31
  • CYCLIC FATIGUE-CRACK GROWTH IN A SIC-WHISKER-REINFORCED ALUMINA CERAMIC COMPOSITE - LONG-CRACK AND SMALL-CRACK BEHAVIOR JOURNAL OF THE AMERICAN CERAMIC SOCIETY Dauskardt, R. H., James, M. R., PORTER, J. R., Ritchie, R. O. 1992; 75 (4): 759-771
  • On the Fractography of Overload, Stress Corrosion and Cyclic Fatigue Failures in Pyrolytic-Carbon Materials used in Prosthetic Heart-Valve Devices Journal of Biomedical Materials Research Ritchie, R., O., Dauskardt, R., H., Pennisi, F., J. 1992; 26: 69-76
  • ON THE FRACTOGRAPHY OF OVERLOAD, STRESS-CORROSION, AND CYCLIC FATIGUE FAILURES IN PYROLYTIC-CARBON MATERIALS USED IN PROSTHETIC HEART-VALVE DEVICES JOURNAL OF BIOMEDICAL MATERIALS RESEARCH Ritchie, R. O., Dauskardt, R. H., PENNISI, F. J. 1992; 26 (1): 69-76

    Abstract

    A scanning electron microscopy study is reported of the nature and morphology of fracture surfaces in pyrocarbons commonly used for the manufacture of mechanical heart-valve prostheses. Specifically, silicon-alloyed low-temperature-isotropic (LTI)-pyrolytic carbon is examined, both as a coating on graphite and as a monolithic material, following overload, stress corrosion (static fatigue), and cyclic fatigue failures in a simulated physiological environment of 37 degrees C Ringer's solution. It is found that, in contrast to most metallic materials yet in keeping with many ceramics, there are no distinct fracture morphologies in pyro-carbons which are characteristic of a specific mode of loading; fracture surfaces appear to be identical for both catastrophic and subcritical crack growth under either sustained or cyclic loading. We conclude that caution should be used in assigning the likely cause of failure of pyrolytic carbon heart-valve components using fractographic examination.

    View details for Web of Science ID A1992GV29800006

    View details for PubMedID 1577836

  • Cyclic Fatigue-Crack Growth in Pyrolytic-Carbon Materials: Implications for Prosthetic Heart-Valve Devices Dauskardt, R., H., Ritchie, R., O. 1992
  • Cyclic Fatigue-Crack Growth in SiC-Whisker-Reinforced Alumina Composite: Long and Small-Crack Behavior Journal of the American Ceramic Society Dauskardt, R., H., James, M., R., Porter, J., R., Ritchie, R., O. 1992; 75: 759-71
  • Small-Crack Behavior and Safety Critical Design Criteria for Cyclic Fatigue in Mg-PSZ, Cyclic Deformation, Fracture and Non-Destructive Evaluation of Advanced Materials Steffen, A., A., Dauskardt, R., H., Ritchie, R., O. American Society for Testing and Materials, Philadelphia. 1992: 69-81
  • CYCLIC FATIGUE OF CERAMICS - A FRACTURE-MECHANICS APPROACH TO SUBCRITICAL CRACK-GROWTH AND LIFE PREDICTION NIPPON SERAMIKKUSU KYOKAI GAKUJUTSU RONBUNSHI-JOURNAL OF THE CERAMIC SOCIETY OF JAPAN Ritchie, R. O., Dauskardt, R. H. 1991; 99 (10): 1047-1062
  • CYCLIC FATIGUE-CRACK PROPAGATION ALONG CERAMIC METAL INTERFACES ACTA METALLURGICA ET MATERIALIA Cannon, R. M., Dalgleish, B. J., Dauskardt, R. H., Oh, T. S., Ritchie, R. O. 1991; 39 (9): 2145-2156
  • CYCLIC FATIGUE LIFE AND CRACK-GROWTH BEHAVIOR OF MICROSTRUCTURALLY SMALL CRACKS IN MAGNESIA-PARTIALLY-STABILIZED ZIRCONIA CERAMICS JOURNAL OF THE AMERICAN CERAMIC SOCIETY STEFFEN, A. A., Dauskardt, R. H., Ritchie, R. O. 1991; 74 (6): 1259-1268
  • Cyclic Fatigue of Ceramics Dauskardt, R., H., Ritchie, R., O. edited by Cox, B., N., Dauskardt, R., H., Ritchie, R., O. 1991
  • Cyclic Fatigue-Crack Propagation along Ceramic/Metal Interfaces Acta Metallurgica et Materialia Cannon, R., M., Dalgleish, B., J., Dauskardt, R., H., Oh, T., S., Ritchie, R., O. 1991; 9 (39): 2145-2156
  • Cyclic Fatigue Life and Crack- Growth Behavior of Microstructurally-Small Cracks in Mg-PSZ Ceramics Journal of the American Ceramic Society Steffen, A., A., Dauskardt, R., H., Ritchie, R., O. 1991; 6 (74): 1259-68
  • Cyclic Fatigue-Crack Propagation in Ceramics and Ceramic Composites Dauskardt, R., H., Ritchie, R., O. 1991
  • Ceramic/Metal Interfaces: Monotonic and Cyclic Fracture Resistance Cannon, R., M., Dalgleish, B., J., Dauskardt, R., H., Fisher, R., M., Oh, T., S., Ritchie, R., O. edited by Dauskardt, R., H, Ritchie, R., O. 1991
  • Cyclic Fatigue of Ceramics: A Fracture Mechanics Approach to Subcritical Crack Growth and Life Prediction Journal of the Ceramic Society of Japan Ritchie, R., O., Dauskardt, R., H. 1991; 10 (99): 1047-1062
  • ON THE INTERPRETATION OF THE FRACTAL CHARACTER OF FRACTURE SURFACES ACTA METALLURGICA ET MATERIALIA Dauskardt, R. H., HAUBENSAK, F., Ritchie, R. O. 1990; 38 (2): 143-159
  • Cyclic Fatigue-Crack Growth Behavior of Short Cracks in SiC- Reinforced LAS Glass-Ceramic Composites Journal of Materials Science Letters Luh, E., Y., Dauskardt, R., H., Ritchie, R., O. 1990; 9: 719-725
  • On The Interpretation of The Fractal Character of Fracture Surfaces Acta Metallurgica et Materialia Dauskardt, R., H., Haubensak, F., Ritchie, R., O. 1990; 2 (38): 143-59
  • Cyclic Fatigue-Crack Propagation Behavior in Pyrolytic Carbon-Coated Graphite for Prosthetic Heart-Valve Applications Ritchie, R., O., Dauskardt, R., H. edited by Kitagawa, H., Tanaka, T. 1990
  • Cyclic Fatigue-Crack Propagation, Stress-Corrosion and Fracture-Toughness Behavior in Pyrolytic Carbon-Coated Graphite For Prosthetic Heart Valve Applications Journal of Biomedical Materials Research Ritchie, R., O., Dauskardt, R., H., Yu, W., Brendzel, A., M. 1990; 2 (24): 189-206
  • Transient Subcritical Crack-Growth Behavior in Transformation-Toughened Ceramics Acta Metallurgicaet Materialia Dauskardt, R., H., Carter, C., Veirs, D., K., Ritchie, R., O. 1990; 11 (38): 2327-336
  • Cyclic Fatigue-Crack Propagation in Mg-PSZ Ceramics Journal of the American Ceramics Society Dauskardt, R., H., Marshal, D., B., Ritchie, R., O. 1990; 4 (73): 893-903
  • Crack Tip Transformation Zones in Toughened Zirconia Journal of the American Ceramics Society Marshall, D., B., Shaw, M., C., Dauskardt, R., H., Ritchie, R., O., Readey, M., Heuer, A., H. 1990; 9 (73): 2659-666
  • Cyclic Fatigue-Crack Propagation in Ceramics: Long and Small Crack Behavior Steffen, A., A., Dauskardt, R., H., Ritchie, R., O. edited by Kitagawa, H., Tanaka, T. 1990
  • Application of Spatially Resolved Raman Spectroscopy in the Study of Transformation Zones in PSZ Journal of the American Ceramics Society Dauskardt, R., H., Veirs, D., K., Ritchie, R., O. 1989; 7 (72): 1124-30
  • Effects of In Situ Phase Transformation on Fatigue-Crack Propagation in Titanium-Nickel Shape-Memory Alloys Dauskardt, R., H., Duerig, T., W., Ritchie, R., O. edited by Otsuka, K., Shimiza, K. 1989
  • Cyclic Fatigue-Crack Growth Behavior in Ceramics Closed Loop Dauskardt, R., H., Ritchie, R., O. 1989; 2 (17): 7-17
  • Fracture-Toughness, Fatigue-Crack Propagation and Creep-Rupture Behavior in Thick-Section Weldments of 3Cr-Mo Pressure-Vessel Steels Developed for High-Temperature/High-Pressure Hydrogen Service High Temperature Technology Spencer, P., N., Dauskardt, R., H., Parker, E., R., Ritchie, R., O. 1988; 2 (8): 17-26
  • Two-Dimensional Spatially Resolved Raman Spectroscopy of Solid Materials Veirs, D., K., Rosenblatt, G., M., Dauskardt, R., H., Ritchie, R., O. edited by Newburg, D., E. 1988
  • Effects of Pre-Existing Grain Boundary Microvoid Distributions on Crack Growth under Monotonic and Cyclic Loading Acta Metallurgicaet Materialia Dauskardt, R., H., Pendse, R., D., Ritchie, R., O. 1987; 9 (35): 2227-42
  • Fatigue Crack Propagation in Transformation-Toughened Zirconia Ceramic Journal of the American Ceramics Society Dauskardt, R., H., Yu, W., Ritchie, R., O. 1987; 10 (70): C-248 - C-252
  • Fatigue Crack Propagation Behavior in Pressure Vessel Steels for High Pressure Hydrogen Service Dauskardt, R., H., Ritchie, R., O. edited by Nisbett, E., G. 1986
  • Laboratory-Scale Semi-Continuous Casting of Aluminum Alloys Metals and Materials Damm, O. F. R., A., Dauskardt, R., H., Garrett, G., G. 1986; 9 (2): 565-6

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