Abstract
A unified constitutive equation is formulated to determine the plastic-creep behavior of metals under a combined state. The elastoplastic constitutive equation with a distribution function of yield stresses is extended by including the viscoplastic property. This theory is applied to predict the plasticity-creep stress-strain relation of SUS304 stainless steel. Two different nonlinear visco-plastic models are proposed for an elevated temperature and room temperature. The steady-state creep term is added into the elevated-temperature model. It is found that the properties of primary creep and the effect of creep on plasticity arise from the plasticity-creep interaction caused by the distribution of internal stresses. The rate sensitivity with over stress is considered for the room-temperature model. The time-dependent stress-strain relation, cyclic creep behavior and biaxial creep behavior are calculated and compared with the experimental results of SUS304 stainless steel.
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