| Autor: |
An, Q., Ravelo, R., Germann, T. C., Han, W. Z., Luo, S. N., Tonks, D. L., Goddard III, W. A. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2012, Vol. 1426 Issue 1, p1259-1262, 4p, 2 Color Photographs, 4 Graphs |
| Abstrakt: |
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] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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