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SHOCK COMPRESSION AND SPALLATION OF SINGLE CRYSTAL TANTALUM.

SHOCK COMPRESSION AND SPALLATION OF SINGLE CRYSTAL TANTALUM.

Authors :
An, Q.
Ravelo, R.
Germann, T. C.
Han, W. Z.
Luo, S. N.
Tonks, D. L.
Goddard III, W. A.
Source :
AIP Conference Proceedings. 2012, Vol. 1426 Issue 1, p1259-1262. 4p. 2 Color Photographs, 4 Graphs.
Publication Year :
2012

Abstract

We present molecular dynamics simulations of shock-induced plasticity and spall damage in single crystal Ta described by a recently developed embedded-atom-method (EAM) potential and a volume-dependent qEAM potential. We use impact or Hugoniotstat simulations to investigate the Hugoniots, deformation and spallation. Both EAM and qEAM are accurate in predicting, e.g., the Hugoniots and γ-surfaces. Deformation and spall damage are anisotropic for Ta single crystals. Our preliminary results show that twinning is dominant for [100] and [110] shock loading, and dislocation, for [111]. Spallation initiates with void nucleation at defective sites from remnant compressional deformation or tensile plasticity. Spall strength decreases with increasing shock strength, while its rate dependence remains to be explored. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0094243X
Volume :
1426
Issue :
1
Database :
Academic Search Index
Journal :
AIP Conference Proceedings
Publication Type :
Conference
Accession number :
100955460
Full Text :
https://doi.org/10.1063/1.3686509