Abstract：With the application and development of composite materials, the interface structure of different materials has been paid more and more attention. The dissimilarity of material properties on two sides of the interfacial layer can cause singularity of the interface. The interface and the cracks around it can lead to stress singularity at crack tips. The mechanical analysis near the bimaterial interface is thus complicated. In this paper, the rectangular interface model of bimaterial was established, and the initial crack was designed near the interface of the material. The influence of finite material size on stress field and stress intensity factor was calculated. The Goursat formula in elasticity was used to obtain the stress field and the stress intensity factor of the rectangular interface of finite size. The stress intensity factor at the crack tip near the rectangular interface was further obtained by the superposition principle and the Green function method. The results show that the stress intensity factor at the crack tip near the interface decreases with the increase of the distance between the crack and the interface, and gradually becomes stable. The results can provide a reference for predicting the failure position of bimaterial interface.
2017, Vol. 38 
