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Titolo:
MATERIAL STRENGTH AND INELASTIC DEFORMATION OF SILICON-CARBIDE UNDER SHOCK-WAVE COMPRESSION
Autore:
FENG R; RAISER GF; GUPTA YM;
Indirizzi:
WASHINGTON STATE UNIV,SHOCK DYNAM CTR PULLMAN WA 99164 WASHINGTON STATE UNIV,DEPT PHYS PULLMAN WA 99164
Titolo Testata:
Journal of applied physics
fascicolo: 1, volume: 83, anno: 1998,
pagine: 79 - 86
SICI:
0021-8979(1998)83:1<79:MSAIDO>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
MANGANIN GAUGES; DYNAMIC-RESPONSE; SHEAR-STRENGTH; LOADED ALUMINA; IMPACT; YIELD; AL2O3;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
R. Feng et al., "MATERIAL STRENGTH AND INELASTIC DEFORMATION OF SILICON-CARBIDE UNDER SHOCK-WAVE COMPRESSION", Journal of applied physics, 83(1), 1998, pp. 79-86

Abstract

In-material, lateral, manganin foil gauge measurements were obtained in dense polycrystalline silicon carbide (SiC) shocked to peak longitudinal stresses ranging from 10-24 GPa. The lateral gauge data were analyzed to determine the lateral stresses in the shocked SiC and the results were checked for self-consistency through dynamic two-dimensionalcomputations. Over the stress range examined, the shocked SIC has an extremely high strength: the maximum shear stress supported by the material in the shocked state increases from 4.5 GPa at the Hugoniot elastic limit (HEL) of the material (11.5 GPa) to 7.0 GPa at stresses approximately twice the HEL. The latter value is 3.7% of the shear modulusof the material. The elastic-inelastic transition in the shocked SIC is nearly indistinctive. At stresses beyond twice the HEL, the data suggest a gradual softening with increasing shock compression. The post-HEL material strength evolution resembles neither catastrophic failuredue to massive cracking nor classical plasticity response. Stress confinement, inherent in plane shock wave compression, contributes significantly to the observed material response. The results obtained are interpreted qualitatively in terms of an inhomogeneous deformation mechanism involving both in-grain microplasticity and highly confined microfissures. (C) 1998 American Institute of Physics.

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Documento generato il 19/08/19 alle ore 08:31:12