IMPACT TEST ANALYSIS OF DYNAMIC MECHANICAL PARAMETERS OF A RIGID-PLASTIC MATERIAL WITH LINEAR STRAIN HARDENING

A simple engineering method to determine dynamic mechanical parameters of a rigid-plastic material with linear strain hardening is presented in this paper. For this purpose, Taylor's impact test, i.e., perpendicular impact of a long rod on a flat rigid target has been used. The rod is made of the tested material. The transcendental equations which explicitly determinate the dynamic yield stress and the plastic strain of the rod have been derived. The general trend of the obtained results is observation of the appearance of higher strengths at higher impact velocities, which is in agreement with expectations. The applied in literature approximation of dynamic properties of metals with strain hardening by means of a perfectly plastic material is far-reaching simplification disagreeing with reality.