Abstract
A unified inelastic constitutive model is proposed in which an evolution equation of the overstress is tried to be introduced to describe an isotropic strain hardening. Another significant assumption is the distinction of the inelastic deformation depending on the evolution of the overstress. Mathematical models are developed for the uniaxial cyclic inelastic deformation of 304 stainless steel and 2 1/4Cr-lMo steel at 650 °C and 550 °C, respectively. Through many numerical experiments, it is shown that the present models give good descriptions for a wide variety of cyclic loading conditions.
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