This study deals with the modelling of damage evolution in the carbon/epoxy laminated composites under static and fatigue loading. A cumulative damage model is developed on the basis of damage evolution due to static and fatigue during cyclic loading. A continuum damage mechanics (CDM)‐based damage model coupling with the micromechanics has been utilized to predict the fatigue behaviour of laminate composites. A multicriterion approach has been introduced to predict the damage behaviour in the longitudinal, transverse, and shear direction at the ply scale. Extensive experimental results on T300/EPL1012 carbon/epoxy laminates are prepared to characterize under static and fatigue loading and to evaluate the proposed model in different conditions. The obtained results show that at the beginning of the cyclic loading, the damage grows suddenly and increases until final failure, which justifies the proposed method is able to predict the evolution of the damage due to static and fatigue loading separately during cyclic loading. The obtained results show that considering damage due to static loading leads to more accurate results, particularly in low‐cycle fatigue.

中文翻译：

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疲劳载荷下层状复合材料的损伤行为

该研究涉及碳/环氧层压复合材料在静态和疲劳载荷下的损伤演化模型。在循环载荷过程中，由于静态和疲劳引起的损伤演变，建立了累积损伤模型。基于连续损伤力学（CDM）的损伤模型与微力学已被用于预测层压复合材料的疲劳行为。引入了一种多准则方法来预测层级尺度上在纵向，横向和剪切方向上的损伤行为。制备了T300 / EPL1012碳/环氧层压板的大量实验结果，以表征在静态和疲劳载荷下的性能，并在不同条件下评估所提出的模型。所得结果表明，在循环加载开始时，损伤突然增加并增加，直到最终失效，这证明了所提出的方法能够在循环载荷过程中分别预测由于静载荷和疲劳载荷引起的损伤的演变。获得的结果表明，考虑到静态载荷造成的损坏会导致更准确的结果，尤其是在低周疲劳中。