異種接合材料の界面端微小き裂の応力拡大係数と自由縁応力特異性の関係に関する数値的および理論的検討

概要

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Free-edge stress singularity develops near the intersection of the interface and the free-surface of bonded dissimilar materials. Fracture at bonded dissimilar materials may therefore occur from an interface crack near the intersection of interface and free-surface. In this study, the relationship between the stress intensity factor of a small edge crack on interface of bonded dissimilar materials and free-edge stress singularity under external loading was investigated numerically by using the boundary element method. The relationship was also investigated theoretically by using the principle of superposition. The results of numerical analyses were compared with those of theoretical analyses. It was found that stress intensity factors K_1, K_2 were proportional to the intensity of free-edge stress singularity K_σ. The numerically determined proportional coefficient between K_1 and K_σ agreed well with the theoretical one, and was not affected by crack length.
社団法人日本材料学会の論文
2002-12-15