照射損傷条件下における照射クリープとスエリングの構成式

概要

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A constitutive equation of irradiation creep for irradiated materials applicable to structural analyses in a multiaxial state of stress was developed. After reviewing microscopic mechanisms of irradiation creep and swelling, the relevant proposed from the view point of metallurgical physics and their applicability were discussed first. Then a constitutive model was developed by assuming that irradiation creep can be decomposed into irradiation-enhanced creep and irradiation-induced creep.By taking account of the SIPA (Stress Induced Preferential Absorption) mechanism, the irradiation-induced creep was represented by an isotropic tensor function of order one and zero with respest to stress, Which is, at the same time, the function of neutron flux and neutro fluence.The volumetric part of the irradiation-enchaced creep was identified with swelling. The irradiation-enchaced creep was described by modifying Kachanov-Rabothnov creep damage theory by incorporating the effect of irradiation Finally the irradiation creep and sweling of type 316 stainless steel at elevated temperatures were predicted by the proposed constitutive equation, and the numerical results were compared with the correspoding experimental results.
社団法人日本材料学会の論文
1990-10-15