复合材料L型端框的失效行为

本文将某典型复合材料结构舱体的L型端框简化为单点连接的L型端框试件,通过试验和仿真分析,对试件拉伸载荷工况下的失效形式和承载能力进行了研究。结果表明,拉伸载荷工况下,L型端框失效形式以分层和基体破坏为主,试验与仿真分析承载力偏差为10.1%,具有良好的一致性。依据研究结果,对复合材料L型端框设计进行改进,通过试验发现,连接点局部粘接金属垫片可以有效提升复合材料L型端框的拉伸承载能力。本文的研究结果可作为复合材料L型端框设计的参考。

Failure behavior of composite L-type frame structure

This paper studied the mechanical behavior and load bearing capability of composite L-type frame specimen under tension loadings through experiments and FEM analysis,which can be used to predict the mechanical response of a typical composite cabin.The results show that delamination and matrix damage are the main failure modes of composite L-type frame under tension loading,and the discrepancy of load bearing capabilities basis on simulation analysis and test is acceptable,which is only 10.1％.Future research shows that better mechanical properties can be obtained by sticking metallic gaskets around the bolted holes.The results can be used as theory reference for composite L-type frame structure designing.