Modeling of rate-dependent hardening behaviors of the TWIP980 steel sheet in tension and compression

This paper deals with modeling of rate-dependent hardening behaviors of the TWIP980 steel sheet in tension and compression. Rate-dependent hardening curves of the TWIP980 steel sheet have been acquired in tension and compression with an advanced experimental technique. The hardening curves of the TWIP980 steel sheet have been approximated at each strain rate by using a rate-independent isotropic/kinematic hardening model. With the material parameters acquired at each strain rate, their dependencies on the strain rate are observed and fitted by functions of the strain rate. A rate-dependent isotropic/kinematic hardening model has been proposed with incorporation of the rate-independent isotropic/kinematic hardening model and rate-dependent functions for the material parameters.