A Rate-Dependent Inelastic Constitutive Model—Part II: Creep Deformation Including Prior Plastic Strain Effects

In this part, a constitutive model for creep deformation is presented, which includes the effect of prior plastic straining. The model is capable of predicting the influence of plastic or creep prestrain and step loading on the subsequent creep deformation as well as cross effect between prestrain and creep strain directions in a multiaxial stress state. The predictions of the model are compared with the experimental data and the agreement is found to be very good. This model, in conjunction with that presented in Part I, would enable one to predict material response to complex loading sequences in the creep-plasticity range.