It is pointed out that the above result is suitable only for the case where the applied mechanical loading at infinity is non-zero: occ 0. Evidently, in the absence of mechanical loading, in view of the coupling characteristic, applied electric loading also causes deformation of a piezoelectric body and further may give rise to crack opening. However, in the case when opo cos (0%) 30 the above 0, which cannot cause the crack to open. In order to modify the above result, in this case we require Xh l Buaj 0. Hence, equation (21 a) is an identity. loading into account that the opening of crack attributed to application of electric for this case, we therefore use equation (21 b) instead of equation (21 a to obtain dual integral equations similar to equations (36). An analogous treatment gives a solution as