Plastic Stress Wave Propagation in a Circular Bar Induced by a Longitudinal Impact

This paper mainly deals with the axisymmetric elastic-plastic wave propagation for the collision of an elastic-plastic bar with an elastic bar. The problem is analysed numerically by finite difference method. In this analysis, different types of both rate independent and rate dependent stress-strain relations are assumed for the elastic-plastic material. The calculated strain histories on the surface of the elastic bar are compared with the experimental results obtained from aluminium 1050 bar (elastic-plastic bar) and steel bar(elastic bar). The experimental results show good agreement with the calculated ones if the high strain-rate sensitivity at high strain rate \((\mathop \varepsilon \limits^{\cdot} \ge_{\!\!\!\!\!-}10^{2}-10^{3}1/{\rm{s}})\) is taken into consideration. The cases of the elastic bars collision and of the elastic-plastic bars collision are also described.