Identification of a microstructural model for steels subjected to large tensile and/or simple shear deformations

The aim of this paper is to study and to model the anisotropic work-hardeni ng behaviour of a low-carbon interstitial free steel under strain-path chan ges. The model used is a mixed hardening model in which the texture anisotr opy is represented by Hill criterion, whereas both the isotropic and the ki nematic hardening are associated with the dislocation structures. In the pr esent investigation, the texture evolution is neglected. Specifically, for an initially orthotropic material, it is assumed that the texture preserves its orthotropic symmetry with respect to a frame that rotates during the d eformation. An experimental study, numerical implementation, identification of this microstructural model is proposed. The computation shows that the model provides a satisfactory quantitative description of the influence of a predeformation on the subsequent work-hardening and this for different me chanical tests.