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摘要: 为了确定剪切载荷作用下含非穿透损伤复合材料挖补修理层合板的破坏模式和抗剪切能力，进行了复合材料挖补修理层合板的剪切试验，并与未损伤复合材料层合板进行对比。试验结果表明，复合材料挖补修理后的层合板具有较高的强度恢复率，且不影响层合板的后屈曲承载能力。同时，建立了剪切载荷作用下复合材料挖补修理层合板的有限元分析（FEA）模型，复合材料母板和补片采用了三维Hashin准则来判定材料失效，母板层与层之间采用零厚度界面单元以有效模拟剪切载荷作用下复合材料母板上、下子板之间的分层。该模型得到的破坏模式与试验结果基本相符。由于挖补修理的设计与工艺复杂性，理论模拟的破坏载荷与试验结果虽不能完全吻合，但其最大15%左右的差异能够满足修理设计的需要。以上结果说明，该模型对剪切载荷作用下复合材料挖补修理层合板的破坏模式和破坏载荷能够进行工程适用的预测。Abstract: Experimental study was conducted to investigate the failure mode and strength behavior of composite flush-repair laminates with blind damage under shear load, and the results were then compared with those from the experiments on virgin laminates without any damage. Experimental results show that composite flush-repair laminates can recover well under shear load, and the repaired laminates have the same post-buckling load-carrying capability as the virgin laminates. Furthermore, a finite element analysis (FEA) model of composite flush-repair laminates under shear load was proposed. In this model, 3D Hashin failure criteria was adopted to identify the damages of laminates on both patch and covering layers, and zero-thickness cohesive elements were used between layers to simulate inter-laminar damage. The failure modes obtained from the model conform to the experimental results. Though the failure loads obtained from theoretical simulation do not exactly match with those from experiment, the 15% maximum deviation can still meet the demand of engineering application, due to the complexity of the design and process of flush-repair. Therefore, the proposed FEA model is able to anticipate the failure mode and failure load of composite flush-repair laminates under shear load.
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Keywords:
- composite laminate /
- flush repair /
- shear load /
- finite element analysis /
- failure mode
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