含分层损伤复合材料层合板分层扩展研究

采用基于Ｍｉｎｄｌｉｎ－阶剪切理论的四节点板单元，分析了含椭圆分层合板分层扩展行为。利用虚裂纹闭合技术计算分层前缘处的总能量释放率，并采用总能量释放率准则作为扩展准则，结合自适应网格移动技术，并考虑了分层前缘闭合接角效应，对 合材料层合板的分层扩展行为进行了模拟分析。结果表明，初始分层形状对其扩展有方式有限大影响。

DELAMINATION GROWTH IN COMPOSITE LAMINATES

Under compressive load, delaminated composite plates may undergo postbuckling that can lead to delamination growth. The Mindlin plate finite element is used to analysis delamination growth in composite laminates with an elliptical delamination. The total strain energy release rate, which is used as the criteria of delamination growth, is calculated with the aid of the virtual crack closure technology (VCCT). The delamination growth behavior is modeled with self-adaptive grid moving technology and considering contact effect at the delamination front. The main issue concerns the effect of the delamination shape and the boundary condition on the delamination growth behavior. The results show that the delamination growth behavior is affected significantly by the shape of delamination.