期刊
SHOCK COMPRESSION OF CONDENSED MATTER - 2011, PTS 1 AND 2
卷 1426, 期 -, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3686509
关键词
Spallation; twinning; dislocation; shock; bcc
资金
- LDRD
- ASC
- PSAAP
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 gamma-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.
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