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在弹性地基梁模型基础上,通过挠度与相对位移关系引入了双线性cohesive本构关系,并通过界面损伤因子统一描述界面损伤状态,在裂纹尖端考虑了损伤黏聚区存在,分别获得了各段通解。采用连续性边界条件求解积分常数,并以裂纹长度以及黏聚区范围为变量求解获得了载荷-位移曲线,从而获得了双悬臂梁(DCB)试件裂纹扩展过程。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,而文中理论考虑了弹性段后非线性的存在,且可同时考察3个cohesive参数的影响。通过研究界面参数变化对载荷-位移曲线的影响,从而对准确模拟界面时cohesive参数的选取提供一定的依据,并分析了界面参数与黏聚区长度的关系。
Based on the elastic foundation beam model, the bilinear cohesive constitutive relation is introduced through the relationship between deflection and relative displacement, and the interface damage state is described uniformly by the interface damage factor. The damage cohesive zone is considered at the crack tip, Section through solution. The integral constants were solved by the continuous boundary conditions, and the load-displacement curve was obtained by taking the crack length and cohesive zone as variables to obtain the crack propagation of double-cantilever beam (DCB) specimen. By comparing with the existing theoretical models, the theoretical analysis of this paper is validated, and the paper considers the existence of nonlinearity after the elastic section, and can examine the influence of three cohesive parameters at the same time. By studying the influence of interface parameters on the load-displacement curve, we can provide a basis for the selection of cohesive parameters when accurately simulating the interface, and analyze the relationship between interface parameters and cohesive zone length.