SUBINTERFACE CRACK IN DISSIMILAR ORTHOTROPIC MATERIALS

A subinterface crack in dissimilar orthotropic materials is considered. The principal axes of one of the materials (say material no. 2 which contains the crack) are aligned along the coordinate axes while the other material's principal axes (say material no. 1) can have an arbitrary angle gamma relative to the interface boundary. The effects of material no. 1 on the behavior of material no. 2 are completely through six generalized Dundurs' constants that are functions of gamma. When gamma = 0 or when the material constant delta((1)) of material no. 1 is equal to one, two of the six constants vanish and only four left have to be considered. A peculiar phenomenon is observed for delta((1)) = 1, i.e. when the material constant delta((1)) of material no. 1 is equal to one the effect of the alignments of material no. 1 on the behavior of material no. 2 is indifferent. Several features of the stress intensity factors for crack faces subjected to self-equilibrating loadings are further investigated without resorting to solving the equations. Some numerical results for crack faces subjected to uniform pressure or shear loadings are also given.