A model for the distortion of the plane stress yield surface in sheet forming simulations

A model is proposed, which allows for the description of the distorted yield surfaces associated with induced anisotropy in finite elastoplastic deformations. The equations are written in a rotating frame, by using current quantities only, and a hardening rule in a rate form is employed. The 3D stress space suitable for the plane stress case is carefully defined, and preliminary results are presented.