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对复合材料端部缺口弯曲(ENF)试件裂纹扩展过程进行了理论分析,研究了界面参数变化对载荷-位移曲线的影响。首先在梁微段分析的基础上,通过双线性Cohesive本构模型模拟了界面损伤。本文模型中考虑了轴力的影响,根据界面损伤程度对模型进行了分段,并分别获得了各段通解。以裂纹长度以及黏聚区范围为变量分析了ENF试件裂纹扩展过程,求解获得了载荷-位移曲线。通过与已有理论模型结果对比,验证了本文理论分析的正确性,且本文理论考虑了弹性段后非线性的存在。分析了界面参数与黏聚区长度的关系,为界面参数的选取提供了一定的依据。
The crack propagation process of the end-notch bending (ENF) specimen was analyzed theoretically, and the influence of interface parameters on the load-displacement curve was studied. First of all, based on the analysis of beam micro-sections, the interface damage is simulated by the bilinear Cohesive constitutive model. In this model, the influence of axial force is considered, the model is segmented according to the degree of interface damage, and the general solutions are obtained respectively. The crack propagation process of ENF specimens was analyzed with the length of crack and cohesive zone as variables, and the load-displacement curve was obtained. By comparing with the existing theoretical models, the correctness of the theoretical analysis in this paper is validated, and the theory of this paper considers the existence of nonlinearity after the elastic section. The relationship between the parameters of the interface and the length of the cohesive zone is analyzed, which provides a basis for the selection of the interface parameters.