L型碳纤维增强复合材料连接件承载力的渐进损伤分析

Progressive damage analysis of the bearing capacity of L-type carbon fibre reinforced composite connectors

从试验与计算两个方面,对比研究了 L型碳纤维增强复合材料连接件(carbon fiber reinforced composite connector,CFRCC)的失效形式和极限承载力.结果表明:(1)在拉伸载荷工况下,复合材料L型CFRCC失效形式主要为圆角处的分层和开孔周边基体破坏;(2)对比两种失效准则和两种退化准则的不同组合,发现在有限元分析中采用混合失效准则和Camanho-Matthews刚度退化准则的渐近失效分析方案可以较好地模拟实验现象;(3)将有限元分析模型及其模拟获得的参数应用于预测不同辅层顺序和圆角半径的L型CFRCC性能,与试验结果吻合良好,极限承载力误差为9.4%.建立的"设计-试验-模拟-预测-验证"分析方法及其获得的结果可为复合材料L型构件的强度设计提供借鉴.

The failure modes and bearing capacities of L-type carbon fibre reinforced composite connectors(CFRCC) were studied through experimental testing and computational simulation.The results demonstrated the following.(1)Delamination at the corner and matrix damage around bolt holes were the dominant failure modes of L-type CFRCC under tensile loading.(2)Comparing the different combinations of two strength failure criteria and two material degradation criteria revealed that the combination of mixed strength failure criteria and the Camanho-Mathews stiffness degradation criteria was more suitable for analysing the progressive damage to the connectors.(3)The predictions from the finite element simulation were in good agreement with the experimental results,and the relative error of the bearing capacity was 9.4%.The strategy of "design-test-simulation-predictionvalidation" and the results obtained in this study may provide reliable guidance for the design of L-type CFRCC.