Abstract
An alternative form of the modified kinematic hardening creep constitutive model is developed for a precise description of anisotropic creep behavior of type 316 stainless steel under repeated multiaxial nonproportional loading conditions. This model is characterized by the unified-type constitutive structure and the auxiliary creep hardening rule. The auxiliary hardening rule is formulated using the memory surface in which the isotropic creep hardening is suppressed and the kinematic type promoted. Different definitions of the memory surface and its evolution equations are proposed based on the same concept as in the previous study. The validity of the creep model is shown by the comparison between the predicted and the typical experimental results on repeated multiaxial nonproportional creep. Also shown are the simulated results of the purely isotropic-hardening model and the purely kinematic-hardening model which are derived as special cases of the present model.
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