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We consider the quasi-static propagation of a Mode III crack along theinterface in a bimaterial plane containing a finite array of small line defects(microcracks and rigid line inclusions). The microdefects are arranged to forma channel around the interface that can facilitate (or prevent) the crackpropagation. The two dissimilar elastic materials are assumed to be weaklybonded, so that there is no kinking of the main crack from the straight path.On the basis of asymptotic formulae obtained by the authors, the propagation isanalysed as a perturbation problem and the incremental crack advance isanalytically derived at each position of the crack tip along the interfacerelative to the position of the defects. Numerical examples are providedshowing potential applications of the proposed approach in the analysis offailure of composite materials. Extension to the case of infinite number ofdefects is discussed.

Mode III crack propagation in a bimaterial plane driven by a channel of small line defects