a Department of Civil and Environmental Engineering, The University of Iowa, Iowa City, IA 52242, USA;b Department of Civil Engineering, National Taiwan University, Taipei, Taiwan, ROC
Abstract:
Hill’s 1948 anisotropic theory of plasticity is extended to include the concept of isotropic–kinematic hardening. The “anomalous” effect can be accounted for by kinematic hardening. It is shown that the quadratic yield function can be used for sheet metals irrespective of its plastic strain ratio R. It is further shown that effects of thickness reduction due to further rolling may be accounted for by kinematic hardening.