Determination of materials parameters under dynamic loading. Part I: Experiments and simulations

Constitutive material models play an important role in numerical simulation of materials deformation at high strain rates. The models require a number of constants normally determined by experiment. In this work, the constants of Johnson–Cook, power law and Zerilli–Armstrong models in tension and compression are identified. In a combined experimental/numerical/optimization approach adopted in this work, only the profile of the deformed specimen after test is required and the numerical simulation of the experiment substitutes the instrumentation. The results of the experiments and the simulations are presented in part I. The second part deals with optimization. The high strain rate tests are conducted using the high rate apparatus called Flying Wedge and Hopkinson bar. The numerical simulations are performed using Ls-dyna hydro-code. Three materials including two low carbon steels, st47 and st52 steels and an aluminum alloy are considered in the investigation.