Using the Richtmyer-Meshkov flow to infer the strength of LY-12 at extreme conditions*

An improved analytical model of the Richtmyer-Meshkov (RM) flow in the elastoplastic materials is presented in this paper. This model describes the stabilization by yield strength effect on the RM flow in solids and linear relationships between initial configurations of perturbation and the growth. Then we make use of the model to analysis the explosion driven RM flow experiments with solid Cu and test our model by comparing the predicted values of existing strength models. Finally, we perform a plate impact experiment with solid LY12 aluminium alloy to validate our model and infer Y=1.23 GPa for a 28 GPa shock and a strain rate of 7.5×10⁶ s^-1.