Modeling of anisotropy induced by evolution of dislocation microstructures on different scales

Many fcc and bcc metals subjected to non-monotonic loading are known to exhibit different kinds of anisotropic hardening. This is due to evolution of (and interaction in) the dislocation microstructure depending on loading type. One purpose of the current work is the investigation of such evolution and interaction in single crystals as well as its effect on their hardening behavior. A single-crystal model accounting for the effects of a change in loading path on the critical shear stress for glide at the glide-system level is developed. On the basis of the crystal plasticity approach an efficient engineering scale model exploiting the insights gained on the lower scales is introduced and applied to simulations of forming processes.