Stress Intensity Factors of Interfacial Cracks

A comparison of mode I and II stress intensity factors at the interfacial crack tip arising from different applied loads and edge dislocation is made. Under the action of point load the stress intensity factor oscillates with the distance from the position of applied load to the crack tip, but there is no oscillation in the stress intensity factor under the action of uniform applied stresses. The stress intensity factor arising from the edge dislocation does oscillate with the distance from the position of edge dislocation to the crack tip. The stress intensity factor for the semi-infinite crack may change sign when different units of length are used, but that for the finite crack may not