复合材料斜接接头强度数值仿真研究
Numerical Simulation of Strength for Composite Scarf Bonded Joint

复合材料斜接接头是胶接结构主要形式之一，其失效模式复杂，包括复合材料层合板和胶层的多种失效模式。提出了一种包含两种不同失效模型的分析方法，采用基于三维Hashin失效准则和指数型刚度退化准则的渐进损伤模型仿真复合材料层合板层内失效，采用内聚力模型仿真胶层失效和层合板层间失效。基于该方法建立了复合材料斜接接头强度分析三维模型，使用试验数据验证了该仿真模型，并利用该模型分析了接头的失效机理。在此基础上，研究了接头斜削角和胶层断裂韧性等设计参数对连接强度的影响，得到了上述参数对斜接接头强度影响的规律。
Scarf bonded joint is one of the main forms of composite joint, the failure modes of composite scarf bonded joint are complex, including composite laminates failure and adhesive layer failure. An computer simulation method for composite scarf joint failure analysis and strength prediction was proposed by introducing two failure models, as cohesive zone model used for simulating adhesive layer, and progressive damage model based on the three dimension Hashin failure criterion and the exponential stiffness degradation criterion for simulating the composite laminates failure. Based on the nonlinear analysis method, a finite element model for predicting adhesive failure and composite laminate failure was established. The structural analysis model was verified by the testing data, and the failure modes were analyzed by using the present model. The influences of the scarf angle and adhesive fracture toughness on the joint strength were studied, and the influence laws were obtained