A Numerical and Theoretical Study on Relationship between Stress Intensity Factor of a Small Edge Crack on Interface and Free-Edge Stress Singularity of Bonded Dissimilar Materials
Seiji IOKA, Takashi MATSUDA and Shiro KUBO
Abstract: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 K1, K2 were proportional to the intensity of free-edge stress singularity KƒÐ. The numerically determined proportional coefficient between K1 and KƒÐ agreed well with the theoretical one, and was not affected by crack length. Key Words:Bonded dissimilar materials, Interface edge crack, Stress intensity factor, Free-edge stress singularity, Principle of superposition