Screw dislocations interacting with a partially debonded interface in cylindrically anisotropic composites

摘要

Interaction between screw dislocations and a partially debonded interface in cylindrically anisotropic composites subjected to uniform stress at infinity is investigated in this paper. Using Muskhelishvili's complex variable method, the closed forms of com-plex potentials are obtained for a screw dislocation and a screw dislocation dipole located inside either matrix or inhomogeneity. Explicit expressions of stress inten-sity factors at the crack tips, image forces and image torques acting on dislocation or the center of dipole are provided. The results show that the crack and dislocation geometry combination plays an important role in the interaction between screw dislocations and interface crack. Furthermore, it is found that the anisotropy of solids may change the shielding and anti-shielding effects arising from screw dislocations and the equi-librium position of screw dislocations. The presented solutions are valid for anisotropic, orthotropic or iso-tropic composites and can be reduced to some navel or previously known results.