Abstract: In practical engineering, a structure is often composed of multi-materials, and crack extends on the interface of the two different materials. A calculation model on bimaterial interface crack is developed. Expansion of the crack is described by using the crack energy release rate, and according to analytic method of interfacial crack energy release rates. Simulation is made on the influence of material character, outer loads, plate depth and different material widths beside the interface on the energy release rate and stress intensity factor during the crack expansion processes. Then the relationship curves between crack energy release rate and elastic modulus, outer loads, plate depths of the two materials are plotted respectively, the relationship of stress intensity factor and material widths beside the interface is achieved. And analysis and comparison are made on the interface crack and single material crack.

Key words: Bimaterial interfacial cracks expansion, Different material character, Energy release rate, Plate of different dimension, Stress intensity factor