Publications

A micromechanical framework for simulating the deformation response of BCC metals

Battaile, Corbett C.; Weinberger, Christopher R.

Recently, molecular dynamics simulations (e.g. Groger et al. Acta Mat. vol.56) have uncovered new insights into dislocation motion associated with plastic deformation of BCC metals. Those results indicate that stress necessary for glide along 110[111] crystallographic systems plus additional shear stresses along non-glide directions may accurately characterize plastic flow in BCC crystals. Further, they are readily adaptable to micromechanical formulations used in crystal plasticity models. This presentation will discuss an adaptation into a classical mechanics framework for use in a large scale rate-dependent crystal plasticity model. The effects of incorporating the non-glide influences on an otherwise associative flow model are profound. Comparisons will be presented that show the effect of the non-glide stress components on tension-compression yield stress asymmetry and the evolution of texture in BCC crystals.