Abstract
Irwin's solution of the stress intensity factor K I for an embedded elliptical cracks was extended to solve for K I for semi-elliptical surface cracks in finite plates. A double series was set up to express the displacement of the crack surface, and the unknown coefficients of the series were determined by the crack surface displacements of two dimensional edge cracks and center cracks. The maximum displacement was determined with an energy method. The results reflected the influence of both the relative crack depth a t and the relative crack length c W . The cases in which elliptical axis ratio a c > 1 were also included.
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