| Citation: | ZHOU Wei, ZHANG Chao, GAN Shuyuanet al. Crack propagation analysis and strength prediction of bonded joints based on XFEM-CZM coupling method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(11): 2121-2130. doi: 10.13700/j.bh.1001-5965.2019.0579(in Chinese)
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In this paper, the crack propagation and interface debonding in the adhesive layer of bonded joints were analyzed based on the coupling method of Extended Finite Element Method (XFEM) and Cohesive Zone Model (CZM). By using the cohesive interfacial element and surface-based cohesive contact to describe the interface between adhesive layer and adherent, the finite element models of single- and double-lap joints were established. The strength properties of bonded joints under tensile loading were predicted and compared with available experiment data. The feasibility of XFEM-CZM coupling method and the effectiveness of cohesive element and cohesive contact interfacial modeling methods were verified. The process of crack propagation from the interior of the adhesive layer to the adhesive layer/adherent interface was simulated, and the damage and failure mechanism in this process was analyzed. The effects of initial crack length, interface stiffness, strength and strain energy release rate on the strength properties of bonded joints were discussed. The numerical results show that the strength of bonded joints decreases with the increase of initial crack length, and it is more obvious in the double-lap joint model. The interface stiffness and strength have greater influence on the strength of bonded joints while the effect of strain energy release rate is small.
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