Shock-induced time-dependent strength behavior in amorphous alloys from a microscopic view

Shock-induced strength behavior and the corresponding microstructural evolution have remained unclear for decades. We propose a viscous-solid model from a microscopic view implied by simulations with non equilibrium molecular dynamics. The model describes the shocked microstructure very well and shows time dependent strength behavior upon shock-induced yielding in amorphous alloys. For the first time, we find that the Kohlrausch-Williams-Watts equation [phi(t) = e(-(t/)beta)] is quantitatively applicable in the modelling of time dependent strength behavior at the non-equilibrium shockwave front. The parameters in the KohlrauschWilliams-Watts equation are found to agree well with several experimental facts. (C) 2016 Elsevier Ltd. All rights reserved.