LS DYNA AS A VALID TOOL FOR ANALYZING STRESS WAVE PROPAGATION UNDER IMPACT LOADING

Abstract

Hopkinson Fracture bar was successfully modeled in ANSYS — LS DYNA. The results showed very good conformity with stress wave theory used for analyzing impact experiments. Ramberg-Osgood constitutive model was successfully employed to simulate high strain rate deformation. The materials constants used in Ramberg-Osgood for the commercial purity aluminum and 440 WGA steel were determined by comparison with experiments. The results showed mesh independence. The current study validates LS DYNA as a tool to analyze dynamic experiments using stress wave theory.