Constitutive Model for Non-Proportionally Multiaxial Time-Dependent Ratcheting of 304 Stainless Steel

Based on the experimental results of non-proportionally multiaxial time-dependent ratcheting of 304 stainless steel at different stress rates and hold-times, a new non-proportionally multiaxial time-dependent constitutive model is proposed by extending Abdel-Karim-Ohno’s non-linear kinematic hardening rule. The model describes the non-proportionally multiaxial time-dependent ratcheting by adding non-proportional static recovery term into the kinematic hardening rule and employing Tanaka’s non-proportion-ality in the isotropic hardening rule.Finally, the capability of the model to describe the non-proportionally multiaxial time-dependent ratcheting is discussed by comparing the simulations with corresponding experi ments. It is shown that the developed model can describe the non-proportionally multiaxial time-dependent ratcheting of 304 stainless steel at room temperature and high temperature reasonably.