The failure of many aircraft structures and materials is caused by the accumulation of fatigue damage under variable-amplitude cyclic loading wherein the damage evolution of materials is complicated. Therefore, to study the cumulative fatigue damage of materials under variable-amplitude cyclic loading, a new nonlinear fatigue damage accumulation model is proposed based on the ecological quality dissipation of materials by considering the effects of load interaction and sequence. The proposed new model is validated by the test data obtained for three kinds of material under multilevel fatigue loading. Compared with the Miner model and Kwofie model, the proposed model can more effectively analyse the accumulative damage and predict fatigue life of different materials under variable-amplitude cyclic loading than others. The study provides a basis for predicting fatigue life accurately and determining reasonable maintenance periods of aircraft structures.

中文翻译：

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基于材料生态质量耗散的非线性累积疲劳损伤新模型

许多飞机结构和材料的失效是由于在变幅循环载荷下疲劳损伤的累积而引起的，其中材料的损伤演化是复杂的。因此，为研究材料在变幅循环荷载作用下的累积疲劳损伤，基于材料生态质量耗散的考虑荷载相互作用和顺序的影响，提出了一种新的非线性疲劳损伤累积模型。通过对三种材料在多级疲劳载荷下的测试数据验证了所提出的新模型。与Miner模型和Kwofie模型相比，该模型可以更有效地分析材料在不同振幅循环载荷下的累积损伤，并预测其疲劳寿命。