Abstract This study presents a fatigue model for constant and variable amplitude cyclic loading by combining kinetic theory of fracture (KTF) with peridynamics (PD). The KTF is applicable to constant and variable amplitude loading, and cumulative damage is inherent in the assumptions. Also, it is extremely suitable for implementation in the PD model of laminates. The standard stress versus cycles to failure data for unnotched laminates provides the determination of necessary parameters for the KTF. Using the test data generated by the Air Force Research Laboratory under the Tech Scout Project, the fidelity of this model is established by simulating three different composite laminates with an open-hole under cyclic loads for stiffness reduction and failure progression. The PD predictions agree with the measured reduction in stiffness as a function of number of load cycles. Also, the progressive damage predictions capture the general characteristics of the experimentally observed damage patterns.

中文翻译：

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复合材料在恒幅和变幅载荷下疲劳失效的近场动力学和断裂动力学联合理论

摘要 本研究将断裂动力学理论 (KTF) 与近场动力学 (PD) 相结合，提出了恒幅和变幅循环载荷的疲劳模型。KTF 适用于恒幅和变幅载荷，累积损伤是假设中固有的。此外，它非常适合在层压板的 PD 模型中实施。无缺口层压板的标准应力与循环失效数据提供了 KTF 必要参数的确定。使用空军研究实验室在 Tech Scout 项目下生成的测试数据，该模型的保真度是通过模拟三种不同的复合层压板，在循环载荷下具有开孔以降低刚度和破坏进展。PD 预测与作为载荷循环次数函数的刚度降低的测量结果一致。此外，渐进式损坏预测捕获了实验观察到的损坏模式的一般特征。