It was noted that the undulating interface of a bi-material, which might result from instability under high stresses, could offer preferred sites for micro-defect accumulation. The interaction between a screw dislocation and a slightly wavy interface had already been studied by using a regular perturbation method. It was found that the Peach-Koehler force, which was calculated on the basis of first-order perturbed solutions of stress and displacement fields, indicated that there were certain so-called equilibrium points at the interface. Dislocations were expected to accumulate around these points. Also, micro-defects such as micro-cracks and micro-voids could nucleate near to these sites.

Dislocation Interacting with a Slightly Wavy Interface. H.Fan, Z.M.Xiao: Mechanics of Materials, 1996, 23[1], 21-8