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建立了Ⅰ型与Ⅱ型失效模式耦合的粘聚单元本构模型,并通过模拟双悬臂梁实验进行了验证。将粘聚单元插入填充区任何2个实体单元之间,预测填充区的随机裂纹,模拟了接头在拉伸载荷下的失效。计算了复合材料基体、界面胶膜、填充物3者不同强度、填充区半径、填充物刚度等多种情况下接头的拉伸失效。计算结果表明:复合材料基体、界面胶膜、填充物3者的强度显著影响接头的承载能力与失效模式;随着填充区半径增大,结构承载能力也随之提高。试验结果验证了模拟结果。
A constitutive model of cohesive element coupled with Type I and Type II failure modes was established and verified by simulating double cantilever beam experiments. The sticking unit was inserted into any two solid elements in the filling zone to predict the random cracks in the filling zone and simulate the failure of the joint under tensile load. The tensile failure of the joints under different conditions, such as the strength of the composite matrix, the interface adhesive film and the filler 3, the radius of the filling zone and the stiffness of the filler were calculated. The calculated results show that the strength of the composite matrix, the interface film and the filler significantly affect the bearing capacity and failure mode of the joint. As the radius of the filling zone increases, the bearing capacity of the structure also increases. The experimental results verify the simulation results.