复合材料开孔层合板双轴拉伸的渐进损伤

Progressive Damage of Composite Perforated Laminates under Biaxial Tensile Loading

应用连续介质损伤力学(CDM)理论,对受双轴拉伸载荷作用的复合材料开孔层合板有限元模型分别计算分析了1∶1、2∶1和3∶1加载比下的渐进损伤,预测了损伤初始发生、延展到最后破坏的渐进损伤过程以及极限载荷。经试验验证三个不同加载比时的极限荷载计算值与试验数据均能较好吻合,纤维、基体、分层损伤演化过程的计算结果符合试验中观察到的现象特征,表明该模型可用于准确预测复合材料开孔层合板在双轴拉伸下的极限强度及渐进损伤过程。

Employing continuum damage mechanics(CDM)theory and FEM,progressive damage evolution of a composite perforated laminates under biaxial tensile loading was calculated for 1∶1,2∶1 and 3∶1 loading ratios,respectively.Whole process of the laminates’ damage initiation,extension and eventual failure as well as its ultimate strength are predicted.The calculated ultimate strengths of the perforated laminates specimen under three different loading ratios agree well with corresponding testing values,and calculated results of fiber,matrix and delamination damage evolution accord with observed phenomena in the experiment,Numerical simulation and experiment indicate that this model could be utilized to predict the ultimate strength and progressive damage process of composite perforated laminates under biaxial tensile loading accurately.