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materials [1-3]. However, most of these works are on two-dirnensionat cases. Lee and Keei [3] evaluated the stress intensity factors ofa crack meeting the interface by body force method, but they didn't consider the singularity near the crack front at the interface in their numerical method. Noda and Kobayashi [4] studied mixed medes stress intensity factors of am inclined semi-elliptical surface erack by a body force method, in which the unknown body force denslties were approximated by the products of fitndamental denslty functions and polynomials. This numerical method was

218 Application of Hypersingular Integral Equation Method to a Three-dimensional Crack Meeting an Interface