| 摘 要： | In this paper, the scattering of elastic waves by penny-shaped interface crack in a layered half space is discussed. From the solution of an integral equation, an expression of the dynamic stress intensity factor is derived which is of partictlar significance in fracture mechanics. when the incident harmonic p wave is perpendicular to the crack face, it becomes an axisymmetric elastic dynamic problem. Suppose that a layered half space is composed of a single isotropic elastic layer and an isotropic elastic half space of a different material, and in the region o≤r≤l, z=o, there is a
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