High Strain Rate Tension Experiments Features for Visco-Plastic Materials

Abstract

The paper considers distinguishing features of the experiment on visco-plastic materials subjected to high strain rate tension, namely non-uniformity of stress–strain state in the working part of a specimen due to the existence of fixing parts and plastic strain localization. The modification of the Kolsky method (or Split Hopkinson Pressure Bar method) is used as experimental technique. The main experimental setup configurations for testing specimens under high strain rate tension are reviewed. We present mathematical models used for assessment of stress components distributed in a neck. The numerical modeling of high rate tension of a visco-plastic axisymmetric specimen is performed, allowing the accuracy of above models to be estimated. The experimental–numerical procedure used to construct a true stress–strain curve on the basis of high rate tensile experiment is described.