THE ORDER OF STRESS SINGULARITIES FOR BONDED AND DISBONDED 3-MATERIALJUNCTIONS

In-plane solutions are given for the order of the stress singularity a t an internal point in an elastic, isotropic solid where three wedges of different materials meet. The three interfaces are either all perfe ctly bonded or a disbond is introduced along one interface. One featur e of this three-material junction that is not present for the correspo nding two-material case, is that each interface is geometrically diffe rent and, therefore, the singular behavior is dependent on which inter face is disbonded. Each material and geometrical combination therefore gives rise to four problems, one with perfect bonding at all interfac es, and three cases of an interface disbond. Numerical results are pre sented for selected three-material junctions. New results for two-mate rial junctions and wedges that serve as special cases for the present study are also presented.