改良9Cr-1Mo鋼の非弾性変形挙動への統一型構成式の適用

概要

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The back stress and overstress are phenomenologically determined by investigating the stress strain response of Modified 9Cr-1Mo steel at 550℃. The overstress is almost constant, and this feature is independent of both the strain range and the accumulated inelastic strain. Based on the investigation of the back stress, cyclic softening behavior is assumed to be caused by the softening of the back stress. An unified constitutive equation is proposed, of which internal variables are able to be related to the back stress and the overstress determined by the experiment. Simulated results of the present constitutive equation are compared with the experiments, to examine its applicability to the inelastic deformation behavior of this material at 550℃.
1989-07-25