Abstract Cohesive zone modelling (CZM) has been extensively considered as a powerful method for analysis of initiation and propagation of delamination in composite laminates subjected to cyclic loading. By making a relation between the damage parameter and the loading cycles, damage accumulation can be calculated, and the fatigue life of a component can be estimated. The aim of the current research is to present a new fatigue damage accumulation (FDA) model. The proposed model is developed based on the concepts of CZM and by linking the fracture mechanics to damage mechanics approaches. For this purpose, a developed user material subroutine (USDFLD) is implemented in a finite element software to simulate the initiation and propagation of damage in an interface layer of a composite material subjected to cyclic loading. The method is validated for different loading conditions using Paris law results. Good agreement between the proposed method and the Paris law results is observed.

中文翻译：

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基于内聚区模型的复合材料在混合模式循环载荷作用下的渐进损伤建模

摘要 内聚区建模 (CZM) 已被广泛认为是分析复合材料层合板在循环载荷作用下分层的发生和传播的有效方法。通过建立损伤参数和加载循环之间的关系，可以计算损伤累积，并可以估计部件的疲劳寿命。当前研究的目的是提出一种新的疲劳损伤累积 (FDA) 模型。所提出的模型是基于 CZM 的概念并通过将断裂力学与损伤力学方法联系起来而开发的。为此，在有限元软件中实现了开发的用户材料子程序 (USDFLD)，以模拟受到循环载荷的复合材料界面层中损伤的发生和传播。该方法使用巴黎定律结果针对不同的载荷条件进行了验证。观察到所提出的方法与巴黎法结果之间的良好一致性。