Viscoplastic Behavior of Type 304 Stainless Steel after Cyclic Preloading. : 2nd Report, Theoretical Investigation

Abstract
Viscoplastic behavior of Type 304 stainless steel after various types of axial cyclic prestraining is investigated theoretically. Viscoplastic behavior, including relaxation, in tensile loading and in the following compression, can be estimated with accuracy by using the viscoplastic theory based on total strain and overstress, with some modifications. The viscosity function which dominates the difference between flow stress levels depending on strain rate is influenced considerably by cyclic loading. However, the relaxation stress drop shows little change. To explain these experimental facts that cannot be explained by the customary theories, the virtual overstress which is caused by cyclic and simple preloadings is introduced. The virtual overstress is added to the customary overstress, but it has no effect on stress-strain behavior in loading under the condition dε≠0.

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