FURTHER INVESTIGATION OF THE J2－INTEGRAL IN BIMATERIAL SOLIDS

The J2-integral induced from the interface of bimaterial solids (J2^interface) is studied by numerical method. First, the effect on the J2-integral induced from the interface is very significant in bimaterial solids, which is inherently related to that induced from the subinterface cracks. Moreover, it can be concluded that either the first or the second component of the Jk-vector is always equal to zero when the contour encloses both the cracks and the whole interface in bimaterial solids. Secondly, it can also be concluded that the interface does produce significanteffect on the J2-integral induced from the subinterface cracks (J2^sub) in bimaterial solids. This effect depends on the geometry of the crack arrangement, which is corresponding to the different interaction effect among the cracks and the interface. Moreover, the interface effect on the J2^sub can be neglected when the distance from the crack center to the interface is large enough, which reveals that the bimaterial solids can be regarded as homogenous solids in fracture analysis when the subinterface crack is far enough from the interface. Three examples are given in this paper.