摘要
The elastic interaction between an edge dislocation and two collinear internal cracks of different length has been investigated. The effect of the distance between two collinear cracks on the crack shielding and image force on the edge dislocation were examined. The effect of the length of the right-hand-side crack on the shielding of the left-hand-side crack and the image force of the dislocation were also considered. The dislocations in the crack play an important role in fracture. Three conditions consisting of an edge dislocation emitting from the right-hand-side crack, originating elsewhere, and emitting from the left-hand-side crack are discussed. We compared the mechanical behavior between edge and screw dislocations near two collinear cracks. Newton's third law is satisfied in this system. Three special cases are discussed. © 1995 Kluwer Academic Publishers.