損傷に伴う弾性定数変化の定式化と有効応力の検討

概要

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Deterioration of materials due to the formation of internal microscopic cavities induces the reduction of elastic stiffness. This stiffness reduction may have significant effects on the local distribution of stress, and hence on global results of inelastic stress analysis. The present paper is concerned with the formulation of the stiffness change induced by anisotropic damage on the basis of continuum damage mechanics, together with the experimental verification of the proposed theory. After discussing damage variables and effective stresses, the change of elastic properties in damage process is formulated by the strain equivalence hypothesis and effective stress determined by the present authors. The proposed theory is compared with those based on the hypothesis of strain energy equivalence, with M. Kachanov's theory, and with the corresponding results of creep damage tests on copper tubular specimens at 250℃.
一般社団法人日本機械学会の論文
1990-11-25