L型层合梁分层破坏的高阶理论分析

Higher-order theoretical analysis of L-type laminated beam's delamination

目前国内外有限元软件均采用一阶剪切变形层合板理论,对板壳等结构均不能计算层间应力,不能分析层间分层破坏,这已成为复合材料结构分析的难题。本文基于整体-局部高阶剪切变形理论对软件Abaqus进行二次开发,对L型梁的层间分层破坏进行了分析。对破坏形式及层间应力大小的计算结果与试验结果进行对比,计算与试验结果吻合。高阶理论有限元方法可以准确判断复合材料层合结构失效形式、位置和应力大小。

Nowadays, the finite element software both home and abroad are based on one order shear deformation theory, which cannot calculate the inter-laminar stress of the plate and shell structures and analyze the inter-laminar delamination. This has become a difficulty for the analysis of composite structures. On the basis of the global-local higher-order shear deformation theory, the paper made twice developments to the Abaqus to analyze the inter-laminar delamination of L-type. The calculations of the collapse modes and inter-laminar stress can match the experimental results by comparison. The higher-order finite element method can precisely tell the failure type, position and the delamination stress of the composite laminated structures.