基于伴随能量释放的渐进损伤演化思想,建立了复合材料层合板面内失效分析的连续介质损伤力学(CDM)分析模型,该模型包含损伤表征、损伤起始判定和损伤演化法则3个方面.基于CDM模型,通过引入损伤状态变量表征损伤,建立了平面应力状态下的材料损伤本构模型.采用损伤参量fE改写Hashin准则,以判定损伤的起始.损伤演化由特征长度内的应变能释放密度控制,建立了损伤状态变量关于等效应变的渐进损伤演化法则.模型中还同时考虑了面内剪切非线性和网格敏感性,并进行了对比分析.对含缺口的[90/0/±45]3.和[(±θ)4]s2类典型复合材料层合板的面内拉伸失效进行了分析,结果表明,本文中的模型能有效预测复合材料层合板的面内拉伸强度.
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