塑性-クリープ相互作用下の非弾性構成式と2 1/4 Cr-1 Mo鋼の変形挙動に対する適用

概要

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A unified inelastic constitutive relation relevant to the plasticity-creep interaction is proposed in the framework of excess stress theory in the first part of the paper. Here, two kinds of isotropic internal variables are introduced: one corresponds to the time-independent static yield stress; and the other is the time-dependent back stress. The kinematic hardening behavior of the material is expressed by the time-dependent back stress. In the second part, simulated results of five kinds of constitutive models, including the present one, are compared with the experiments of 2 1/4 Cr-1 Mo steel at 600℃ to examine the validity and the applicability of the complex loading history of the plasticity-creep interaction condition. some remarks on the inelastic behavior are also stated to interpret the rate-dependence of the material under a high temperature regime and the accumulation of ratcheting strain.
1986-04-25