Interaction of a screw dislocation with a bi-material interface in anti-plane couple stress elasticity

We analyze the contribution of couple stresses to the interaction between a screw dislocation and a bi-material interface. Using Fourier integral transforms, we develop analytical representations for the stress distributions in each of the adjoining materials as well as the interaction force acting on the dislocation. Our results are illustrated with several numerical examples, which indicate that couple stresses significantly influence the corresponding stress distributions and the mobility of the dislocation when the distance between the dislocation and the material interface remains below or near the characteristic length of the materials.