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You searched on: Author: sudook kim

Displaying records 31 to 40 of 44 records.
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31. Acoustic Study of Texture in Polycrystalline Brass
Published: 5/1/1999
Authors: K Foster, S L Fairburn, R G Leisure, Sudook A. Kim, Davor Balzar, G A Alers, H M Ledbetter
Abstract: Resonant ultrasonic spectroscopy was used to measure the orthorhombic elastic constants of rolled, polycrystalline plates of Cu, Cu - 5% Zn, and Cu - 15% Zn. The experimental results were in good agreement with theory for the Cu and the Cu-15% Zn ma ...

32. Internal Friction and Creep-Recovery in Indium
Published: 5/1/1999
Authors: H M Ledbetter, N Sizova, Sudook A. Kim, H Kobayashi, S Sgobba, L Parrini
Abstract: Using low-stress pseudoshear deformation, we measured the ambient-temperature creep-recovery behavior of polycrystalline indium.

33. Low-Temperature Elastic Constants of Polycrystalline Indium
Published: 8/1/1998
Authors: Sudook A. Kim, H M Ledbetter
Abstract: Using an ultrasonic pulse-echo method, we measured the elastic constants of polycrystalline indium from 300 K to 5K. All elastic constants showed regular temperature behavior as predicted by an Einstein-oscillator model. The shear and Young moduli ...

34. Accuracy of Resonant Ultrasound Spectroscopy: An Experimental Study
Published: 10/1/1997
Authors: M C Renken, Sudook A. Kim, K W Hollman, C M Fortunko
Abstract: We use Resonant Ultrasound Spectroscopy (RUS) to routinely determine elasticstifftness coefficents. To establish the uncertaintly of RUS, we determined the longitudinal wave velocity in a cylinder (25.6 mm x 25.4 mm diam.) of fused silica using thre ...

35. Internal Friction and Elastic Constants of Sintered Titanium
Published: 12/1/1996
Authors: H M Ledbetter, Martin Dunn, Sudook A. Kim
Abstract: Using a Marx-oscillator standing-wave resonance method, we measured the internal friction {quaternary}^-1^ of sintered titanium containing up to 26 volume-percent voids (c). The surprising {quaternary}^u1^ versus-c curve shape, an exponential incre ...

36. Clementite's Elastic Constants
Published: Date unknown
Authors: Sudook A. Kim, H M Ledbetter
Abstract: By extrapolation, we estimated cementite's elastic constants. Altogether, we studied seven Fe-C binary alloys varying from 0 to 17.3 atomic percent carbon. Thus, we measured hypoeutectoid, near eutectoid, and hypereutectoid alloys. For cementite, ...

37. Elastic Coefficients of Monocrystal Gelena (Pbs)
Published: Date unknown
Authors: Sudook A. Kim, H M Ledbetter
Abstract: Using acoustic-resonance spectroscopy, we measured the three independent Voigt C^dkj^ (C^d11^, C^d12^, C^d44^) of cubic-symmetry galena (lead sulphide). Our results clarify the discrepancies of previous reports. We report also the internal friction ...

38. Elastic Stiffnesses and Internal Frictions of Monocrystal Quartz
Published: Date unknown
Authors: H M Ledbetter, Sudook A. Kim, M Lei
Abstract: Using acoustic-resonance spectroscopy (with only two point contacts with the specimen), we measured both the real and imaginary parts of the elastic-stiffness tensor C^dij^ of a cultured quartz monocrystal. With trigonal symmetry (32 point group, P3 ...

39. Elastic-Stiffness Coefficients of Titanium Diboride
Series: Journal of Research (NIST JRES)
Published: Date unknown
Authors: H M Ledbetter, Sudook A. Kim, T Tanaka
Abstract: Using acoustic-resonance spectroscopy, we measured the monocrystal elastic-stiffness coefficients, the Voigt Cij, of TiB^d2^. With hexagonal symmentry, TiB^d2^ exhibits five independent C^dij^: C^d11^, C^d33^, C^d44^, C^d66^, C^d13^. Using Voigt-Re ...

40. Internal Friction Tensor in Langasite (LA^d3^Ga^d5^SiO^d14^)
Published: Date unknown
Authors: H M Ledbetter, Sudook A. Kim
Abstract: Using acoustic spectroscopy, we measured the complete elastic-constant and internal-friction tensor C^dy^ = C^dy^ (1+Q^u-1^^dy^) of langasite, a trigonal-symmetry piezoelectric. To understand the internal friction, we need a mechanism that explains, ...

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