An inverse method for the identification of strain-rate sensitivity parameters of sheet-steels

It is widely accepted that most materials behave differently when submitted to different levels of strain-rate. The strain-rate sensitivity can be modelled by means of constitutive models. The various models proposed in the literature are quite different and criteria for their selection are not available. Furthermore material data are not commonly available because their identification is rather difficult. The aim of this work is to propose a numerical procedure to identify the material parameters needed to take into account for the strain-rate sensitivity. The identification procedure is based on the simulation of an experimental test. Two different constitutive models have been considered. Advantages and limitations of these models are discussed and parameters for the two considered materials were identified.