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为解决复合材料接头强度分析中由于接触造成的收敛困难问题,自定义了具有特殊本构关系的粘接元用来模拟接触,该单元只能传递压力而不能传递拉力。自定义的粘接元被置于两接触对之间用来传递接触压力,从而保证了接触体之间在接触面上的变形协调关系。同时,建立了复合材料单钉接头的三维累积损伤有限元模型。基于文献中材料性能退化模型,对纤维及基体压缩破坏的刚度退化模式做了改进,并利用自定义粘接元接触技术及改进后的刚度退化方法对模型进行了有限元模拟。最后对四组相应试验件进行了试验验证,试验结果和模拟结果吻合较好,证明了自定义粘接元接触技术以及文中模型和算法的有效性。
In order to solve the problem of convergence caused by the contact in the strength analysis of composite joints, a self-defined adhesive element with special constitutive relation is used to simulate the contact. The element can only transmit the pressure and can not transmit the pulling force. Custom adhesive elements are placed between the two contact pairs to transmit the contact pressure, thus ensuring the coordination between the contacts on the contact surface. At the same time, a three-dimensional cumulative damage finite element model of a single-spliced composite material was established. Based on the material degradation model in the literature, the stiffness degradation mode of fiber and matrix compression failure was improved. The finite element simulation of the model was made by using the self-defined bonding element contact technique and the improved stiffness degeneration method. Finally, the corresponding experimental parts of the four groups were tested and verified. The experimental results are in good agreement with the simulation results, and the validity of the self-defined adhesive element contact technology and the model and algorithm are proved.