Dynamic Copper and Polyethylene Strengths in Shockless Loading to 15 GPA According to the Data of Explosive Magnetic Experiments with Cylindrical Three-Layer Liner Systems

This paper presents the computational analysis of an experimental three-layer liner system, Al-polyethylene-Cu and Al-water-Cu, designed for the study of dynamic strength of low-density and high-density materials using the perturbation growth caused by the Rayleigh-Taylor instability. Copper and polyethylene dynamic strength models developed by VNIIEF are used. Comparison between computations and experiments showed good agreement with a model for copper obtained previously from analysis of high-pressure explosive driven shock-free experiments. The data also allowed us to refine a model for polyethylene obtained from the analysis of previous experiments.

I. Introduction

Explosive [1] and electromagnetic [2]–[4] liner accelerations are used to study dynamic shear strength of materials by measuring perturbation growth caused by Rayleigh-Taylor, Richtmyer-Meshkov, or other instabilities. Previous numerical simulations of experiments with planar liners at loading pressures up to 40 GPa [1] have allowed us to develop elastic-plastic and relaxation dynamic strength models for aluminum and copper (V.A. Rayevsky's and V.P. Solovyev's teams).