The simple shear oscillation and the restrictions to elastic-plastic constitutive relations (Q1818132)

Based on definitions of hardening, softening and ideal plastic behavior of elastic-plastic materials in the true stress tensor space, the authors relate the phenomena of simple shear oscillation to the oscillatory occurrence of hardening and softening behavior of elastic-plastic materials, i.e. to the case when the hardening behavior changes cyclically from hardening to softening. The correct formulation of the constitutive equation is discussed.