Directional-Dependence in Shock-Induced Melting of FCC Metals.

Shock-induced melting in Al, Cu and Lennard-Jones single crystals was investigated employing large-scale non-equilibrium molecular dynamics (NEMD) and constant-stress Hugoniostat simulations. The atomic interactions in Cu and Al are modeled with embedded atom method potentials. The solid and liquid Hugoniot of these materials were generated for shock propagation along the low-index orientations: (100),(111) and (110). It is found that within sub-nanosecond time-scales, shock melting occurs at lower pressures (temperatures) for (110) shocks, at intermediate pressures (temperatures) for (111) and at higher pressures (temperatures) for (100) shocks. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]