クリープにおける交差硬化の定式化と銅のクリープ損傷に対するクリープ速度の影響

概要

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The present paper is concerned with a more elaborate modelling of creep and creep damage in polycrystalline metals and the experimental evaluation of the proposed model. By ascribing the reduction of creep rates caused by the principal stress rotation (i.e., cross hardening) to the intersection mechanism of dislocation on active slip planes in crystal grains, a constitutive equation of creep is first formulated. Then, in view of the metallurgical observations on the nucleation and the growth of grain boundary cavities in creep damage process, an evolution equation of anisotropic creep damage is expressed as a function of the stress, the damage tensor and the creep rates of the material. Finally, the validity of the proposed theory is discussed by performing systematic creep damage tests of thin-walled copper tubes under non-steady multiaxial states of stress at 250℃.
一般社団法人日本機械学会の論文
1986-04-25