复合材料层板静压入破坏机制

建立一个有效的计算模型, 以分析复合材料层板在静压入过程中发生分层、 纤维断裂的现象。该计算模型基于有限元程序的三维逐渐损伤理论对层板的静压入全过程进行模拟, 对逐层逐个单元的损伤进行判断, 可以模拟任意角度、 铺层厚度的层板在递增载荷下的逐渐损伤破坏过程。对炭纤维增强环氧树脂基复合材料层板在静压入过程中发生的分层和纤维断裂现象进行预测,并与实验结果进行比较; 对炭纤维增强双马来酰亚胺树脂基复合材料层板在静压入过程中的分层损伤和最终破坏接触力的大小进行预测,并与低速冲击下的结果进行比较。数值仿真与实验结果吻合较好, 表明静压入分析方法是复合材料层板在低速冲击下产生损伤的可替换分析方法。 

Failure mechanism of composite laminate due to quasi-static pressure

An effective calculational model was established to analyze delamination and fiber failure of composite laminates due to quasi-static pressure. The calculational model was based on the 3D progressive damage theory, which can simulate the whole process of the composite laminates failure due to quasi-static pressure. It could calculate and judge failure by each layer and each element, and predict the progressive damage process under increasing load for any layer orientation angle and thickness. The prediction of delamination and fiber failure phenomenon of carbon fiber/epoxy resin laminates as well as delamination and ultimate failure contact force of carbon fiber/bismaleimide resin laminates was made by using this model, and compared with the experiment results. Good agreement between calculational results and experimental results was obtained, which proves that the quasi-static indentation (QSI) is an alternative analysis of low-velocity impact.