表面き裂の全面塑性解による J 積分材料抵抗値の評価

概要

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For the Leak Before Break (LBB) assessment of the nuclear piping system, analysis of the surface crack behavior in the ductile materials is indispensable. In this paper, the surface crack problems are treated with the finite element method based on the power-law hardening constitutive relation and the deformation theory of plasticity. The normalized solutions for the global J-integral and the displacement are obtained under the fully plastic condition. The models analyzed are plates with a semielliptical surface crack subjected to uniform tension. The solutions are applied to estimate the J-integral resistance for stainless steel type 304 from the experimental relation between load and crack opening describes well the constraint around the tip of the surface crack. The general J-integral characteristics of the surface crack penetration should be clarified by performing also experimental studies.
一般社団法人日本機械学会の論文
1986-02-25