重合网格法在复合材料分层问题中的应用

使用重合网格法(S-FEM)分析了混合模态下CFRP层合板分层问题。首先将虚裂纹闭合技术集成到S-FEM程序中,求解了复合材料分层尖端处的应变能释放率。然后把重合网格法数值结果与基于梁理论的计算结果及实验数据进行了比较。结果表明,对于单方向及多方向CFRP复合材料层合板,重合网格法都能够得到更精确的数值,是一种有效的计算复合材料裂纹尖端应变能释放率的方法。

Mixed-Mode Delamination Analysis of CFRP by Using Element Overlap Technique

An accurate analytical methodology to obtain strain energy release rate(SERR) along the delamination front was presented.This was achieved by using an element overlay method(S-FEM) combining a numerical integration of the virtual crack closure-integral technique(VCCT).VCCT was incorporated with S-FEM code to generate SERR curves for the analytical case.The interfacial fracture energy can be obtained accurately based on the presented method. The results were compared with the experiments data and general FEM results.It is shown that the values agree well with the experiments results for both of unidirectional and multidirectional CFRP laminates.