An improved physically based behaviour law for ferritic steels and its application to crash modelling

An improved physically based behaviour law for ferritic steels is presented in this paper, and used to perform crash simulations. Flow stress depends on three contributions: the friction stress, the work hardening at low strain rate and the effective stress derived from the viscoplastic potential. These three terms are in most existing approaches simply summed up, but an original alternative mixing solution has been proposed for bcc metals by …