異種接合材の界面端微小き裂の応力拡大係数に対する接合形状の影響

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. Therefore, fracture of bonded dissimilar materials may occur at the intersection of the interface and the free-surface. Free-edge stress singularity depends on the combination of material properties and shape of bonded dissimilar materials. In this study, the relation between the stress intensity factor of a small edge crack on interface and free edge stress singularity of bonded dissimilar materials under external loading was investigated numerically by using the boundary element method with changing the combination of wedge angle of bonded materials. 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 of small edge crack on interface K_1, K_2 were proportional to the intensity of free-edge stress singularity without crack 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 when proper normalization was applied.
社団法人日本材料学会の論文
2004-05-15