Abstract
In this paper, effects of viscosity and aging on plastic deformation behavior of SUS316L stainless steel in tensile reloading and in relaxation after cyclic preloading, are investigated experimentally, and are analyzed theoretically based on the Two-Factors constitutive concept. Strain rate dependency of plastic flow stress decreases with an increase of number of cycle in precycling, this phenomenon is found not to be caused by viscosity change, but by an increase in aging effect. It is found that due to cyclic loading almost no change in viscosity property occurs for SUS316L stainless steel. The Two-Factors constitutive model is confirmed to give systematic predictions both on plastic flow behavior and on relaxation behavior of SUS316L stainless steel even after cyclic prestraining.
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