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Material interface fracture is the main failure mode of composite material component.  As the fundamental research of the composite property, the study of bimaterial interface plays an important role in the performance evaluation of the composite. The cohesive zone model is an effective method to simulate the initiation and propagation of the crack by properly selecting the parameters.

In this paper, a bilinear cohesive zone model is used to simulate the fracture behavior of the interface of bimaterial under compression. The three-dimensional cohesive element with eight nodes is employed. The load-displacement curves and the interfacial damage modes are obtained for different combinations of materials. The effect of the interfacial parameters on the failure process of the bimaterial interface is studied.

The results demonstrate that the failure of the bimaterial interface severely depends on the properties and geometrics of the two materials. It is also found that the ultimate failure load will increase for the enhanced cohesion strength of the interface.