Abstract
Plane strain problems for a crack parallel to an interface between dissimilar materials, with a crack-face contact zone near one of the crack tips, are studied. These subinterface crack problems are formulated as nonlinear systems of Cauchy-type singular integral equations which are solved numerically. The physically pathological feature of interpenetration of the crack faces is eliminated in the solutions by accounting for contact of the crack faces. The solutions predict that for a subinterface crack in a combined normal and shear stress field, the crack may extend even when the normal stress is compressive. The behavior of a subinterface crack depends on both Dundurs parameters α and β rather than only on β for an interface crack. The behavior of the cracks can be determined from the interaction of the singularities at the crack tips caused by the normal and shear stress fields.
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