Abstract
General solutions to the problems of the elastic field perturbation produced by an elliptic inhomogeneity with an adhering or a slipping interface are used to investigate the image glide force exerted on an edge dislocation. Glide equiforce contours are worked out for different values of the relative hardness, the geometry parameter, and the Burgers vector orientation. The special case of a dislocation near a rigid line, either free to rotate or fixed, is also considered. By comparing the results for the two kinds of boundary it is found that the dislocation-trapping power of a slipping interface is definitely higher than that of an adhering one. It is also shown that the general interaction features cannot be deduced by studying a dislocation collinear with one of the ellipse's axes.