ABSTRACT

In this work, the influence of repair angle on the bending strength recovery of scarf patch repaired composites with a honeycomb sandwich structure was experimentally and numerically investigated. The repair angle played an important role in the bending strength recovery of the scarf patch repaired composites. The optimum technical parameter of repair angle was found to be 30:1, while the bending strength recovery value could be as high as 99.6%. Besides, the repair simulation model was established based on finite element analysis to predict the failure load of repaired honeycomb sandwich composites with various repair angles. The simulation results agreed well with the experimental data, with a maximum error of 4.99%. The simulation model was further optimised using Kriging model, and the error between the predicted and tested results was only 4.49%. This model could significantly contribute to avoiding repeated experiments, allowing repair angle to be optimised, and maximally recovering the preliminary performance of the composites.

摘要

在这项工作中，实验角度和数值研究了修复角度对蜂窝状夹层结构的丝巾修补复合材料弯曲强度恢复的影响。修复角在围巾补丁修复的复合材料的弯曲强度恢复中起着重要作用。最佳修复角度技术参数为30：1，而弯曲强度恢复值可高达99.6％。此外，基于有限元分析建立了维修仿真模型，以预测不同维修角度的蜂窝状夹芯复合材料的破坏载荷。仿真结果与实验数据吻合良好，最大误差为4.99％。使用Kriging模型进一步优化了仿真模型，预测结果与测试结果之间的误差仅为4。49％。该模型可以极大地避免重复实验，优化修复角度，并最大程度地恢复复合材料的初步性能。