Constitutive Modeling for Uniaxial Time-Dependent Ratcheting of SS304 Stainless Steel

Based on the experimental results of uniaxial time-dependent ratcheting behavior of SS304 stainless steel at room temperature and 973 K [Kang, G.Z., Kan, Q.H., Zhang, J., 2006. Time-dependent ratcheting experiments of SS304 stainless steel. Int. J. Plast. 22, 858–894], three kinds of time-dependent constitutive models were employed to describe such timedependent ratcheting by using the Ohno–Abdel-Karim kinematic hardening rule [Abdel-Karim, M., Ohno, N., 2000. Kinematic hardening model suitable for ratchetting with steady-state. Int. J. Plast. 16, 225–240], i.e., a unified visco-plastic model, a creep-plasticity superposition model and a creep-visco-plasticity superposition model. The capabilities of such models to describe the time-dependent ratcheting were discussed by comparing with the corresponding experimental results. It is shown that the unified visco-plastic model cannot provide reasonable simulation to the time-dependent ratcheting, especially to those with certain peak/valley stress hold and at 973 K; the proposed creep-plasticity superposition model is reasonable when the creep is a dominant factor of the deformation, however, it cannot provide a reasonable description when the creep is weak; the creep-visco-plastic superposition model is reasonable not only at room temperature but also at high temperature. 2006 Elsevier Ltd. All rights reserved.

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