Strain rate dependent yield behavior under compression load of metallic materials based on experimental data

A matter of interest in development of empiric cons titutive material laws, especially in terms of yielding, is the knowledge of the material behavior up to large deformation at different strain rates. The compression test seems to be appr opriate method for gaining data up to large grades of deformation. However, the gained measurem ent data does not allow the exact reading of material models for direct use in numeri cal analyses. Reasons for deviations are influences such as friction which leads to boundary constraints and thus to a multiaxial stress state at increasing deformation. This article propo ses a method to compute the actual stress in the dynamic compression test taking the friction in to account. The method is based on finite element analyses and experimental data. The experim ental data are gained from dynamic compression tests at different strain rate levels u sing mild steel.