由于层间应力的存在,受面内载荷作用的复合材料层压板实际处于多轴应力状态.构建了由刚性元、弹簧元和二维板元构成的准三维有限元模型,结合单向板在典型应力状态下的疲劳试验结果和疲劳损伤模型,发展了一种考虑三维应力的、预测任意铺层多向层压板疲劳寿命的分析方法,包括应力分析、静力和疲劳累积损伤失效分析及材料性能退化3个主要部分,能够模拟面内和层间损伤产生、发展直至层压板整体破坏的完整过程,并得到疲劳寿命.对2种T300/QY8911多向铺层板进行了实际计算,寿命预测结果与试验结果吻合较好.
The multidirectional (MD) composite laminates subjected to in-plane loading are in the three dimensional stress state due to the presence of interlaminar stresses. A quasi- 3D finite element model consisting of plate elements, spring elements and rigid elements was established which, together with the fatigue damage models of unidirectional laminate, is used to construct a fatigue life estimation procedure for MD laminates with arbitrary stacking sequences. This is an integration of stress analysis, static strength analysis, cumulative damage analysis and the material property degradations. The application of the procedure for two T300/QY8911 composite laminates demonstrates good agreement of fatigue life prediction with the experiments.
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