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Elastic constants of a Laves phase compound: C15 NbCr{sub 2}

Description: The single-crystal elastic constants of C15 NbCr{sub 2} have been computed by using a first-principles, self-consistent, full-potential total energy method. From these single-crystal elastic constants the isotropic elastic moduli are calculated using the Voigt and Reuss averages. The calculated values are in fair agreement with the experimental values. The implications of the results are discussed with regards to Poisson`s ratio and the direction dependence of Young`s modulus.
Date: April 1, 1997
Creator: Ormeci, A.; Chu, F.; Wills, J. M.; Chen, S. P.; Albers, R. C.; Thoma, D. J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Earth Solids and Dynamic Nonlinear Elasticity

Description: The authors` intention is to describe several manifestations of nonlinear behavior in rock. Nonlinear response may manifest itself in a variety of manners, including a nonlinear stress-strain relation, nonlinear attenuation, harmonic generation, resonant peak shift and slow dynamics, all of which are related. The authors have ample evidence that the responsible mechanism for nonlinear response [to first order] is the presence of compliant features and the influence of fluid. They define complia… more
Date: May 1997
Creator: Johnson, Paul A. & Van Den Abeele, Koen E.-A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Characterization of aging in organic materials on atomic-, meso- and macro-length scales by {sup 13}C NMR spectroscopy

Description: A fundamental understanding of aging in an organic material requires that one understand how aging affects the chemical structure of a material, and how these chemical changes are related to the material`s macroscopic properties. This level of understanding is usually achieved by examining the material on a variety of length scales ranging from atomic to meso-scale to macroscopic. The authors are developing and applying several {sup 13}C nuclear magnetic resonance (NMR) spectroscopy experiments… more
Date: October 1, 1997
Creator: Assink, R. A.; Jamison, G. M.; Alam, T. M. & Gillen, K. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Critical issues in measuring the mechanical properties of hard films on soft substrates by nanoindentation techniques

Description: This study explores the difficulties encountered when using conventional nanoindentation techniques to measure the Young`s modulus and hardness of hard films on soft substrates. In general, the indentation measurement of film/substrate systems is affected by four material properties: the Young`s modulus and hardness of the film, and the Young`s modulus and hardness of the substrate. For the particular case of a hard film on a soft substrate, there is a tendency for the material around the hardn… more
Date: December 31, 1997
Creator: Hay, J.C. & Pharr, G.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Microwave versus conventional sintering of silicon carbide tiles

Description: Silicon carbide is being evaluated as an armor material because of its lightweight, high-hardness, and excellent armor efficiency. However, one of the problems associated with silicon carbide is the high cost associated with achieving fully dense tiles. Full density requires either hot pressing and sintering or reaction bonding. Past efforts have shown that hot pressed tiles have a higher armor efficiency than those produced by reaction bonded sintering. An earlier stuy showed that the acoustic… more
Date: May 7, 1997
Creator: Kass, M. D.; Caughman, J. B. O.; Forrester, S. C. & Akerman, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Indentation modulus and yield point of Au(111), (001), and (110)

Description: Nanoscale indentation experiments were performed on Au using the Interfacial Force Microscope (IFM) in an indentation mode. The indentation modulus and yield point were measured for three orientations of the Au surface: (111), (110), and (001). The indentation modulus for the (111) surface was found to be 36% greater than for the (001) surface and only 3% higher than the (110) surface. Additionally, the yield point was found to vary between orientations, but the shear stress resolved on {l_brac… more
Date: December 31, 1997
Creator: Kiely, J. D. & Houston, J. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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