SOLUTION OF ANALYTICAL-VARIATIONAL METHOD ON BI-MATERIAL INTERFACE CRACK AND ITS COMPARISON WITH EXPERIMENT

An analytical method is developed to describe the fields of stress and displacement in a bi-material strip with an edge interfacial crack. A ll of the basic governing equations, boundary conditions on crack surf aces, and conditions of continuity along the interface are satisfied b y the eigen-function expansion method. The other boundary conditions w ill be satisfied by the generalized variational principle. Good conver gence of generalized stress intensity factors is obtained, and the val ues of crack opening displacement and energy release rate obtained by this method are close to the experimental results. Some problems regar ding oscillatory singularity, contact zone and energy release rate are discussed. Finally, the effects of modulus, thickness and crack lengt h to mode mixity are presented.