APPLICATION OF THE PLASTICITY MODELS THAT INVOLVE THREE STRESS INVARIANTS

Increasing experimental evidence shows that the classical J 2 plasticity theory may not fully describe the plastic response of many materials, including some metallic alloys. In this paper, the effect of stress state on plasticity and the general forms of the yield function and flow potential for isotropic materials are assumed to be functions of the first invariant of the stress tensor (I 1 ) and the second and third invariants of the...