Molecular dynamics simulation of materials response to high strain-rate loading
A molecular dynamics (MD) analysis of conservation of momentum through a shock front is presented. The MD model uses a non-traditional boundary condition that allows simulation in the reference frame of the shock front. Higher order terms proportional to gradients in the density are shown to be non-negligible at the shock front. The simulation is used to study the sequence of thermodynamic states during shock loading. Melting is observed in the simulations, though above the thermodynamic melt curve as is common in homogeneous simulations of melting. High strain-rate tensile loading is applied to the growth of nanoscale voids in copper. Void growth is found to occur by plasticity mechanisms with dislocations emerging from the void surface. [molecular dynamics, shock loading, conservation of momentum, shock melting, void growth]
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Defense Programs (DP) (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 13797
- Report Number(s):
- UCRL-JC-133964; DP0101031; DP0101031; TRN: US0110782
- Resource Relation:
- Conference: International Conference on High Pressure Science and Technology, Honolulu, HI (US), 07/25/1999--07/30/1999; Other Information: PBD: 22 Jul 1999
- Country of Publication:
- United States
- Language:
- English
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