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建立含穿透裂纹铝合金板复合材料单面胶接修补板条的三维有限元模型,基于位移外推法对裂纹尖端的应力强度因子(SIF)进行求解。使用全试验设计的方法对不同修补参数下修补板条的单向拉伸试验进行仿真模拟,利用二次方程描述并研究了补片长度、补片厚度及胶层弹性模量共同作用时对SIF的影响,确定了以SIF为评价指标时对修补效果影响最大的修补参数,优化了修补设计,并应用优化修补参数进行单向静拉伸试验。结果表明,当三类修补参数共同作用时,补片长度对修补效果影响最大;使用优化修补参数单面修补试验件的破坏强度比未修补板的提高了12.1%,恢复到完好板的90.5%。
A three-dimensional finite element model of a single-faced adhesive patchwork with penetration-cracked aluminum alloy plate composite was established, and the stress intensity factor (SIF) of the crack tip was solved based on displacement extrapolation. The full test design method was used to simulate the uniaxial tensile test of repairing slats under different repair parameters. The quadratic equation was used to describe and study the influence of SIF (patch length, patch thickness and elastic modulus) , The parameter of repair with the most influence on the repair effect with SIF as the evaluation index is determined, the repair design is optimized, and the one-way static tensile test is carried out by using the optimized repair parameter. The results show that the length of the patch has the greatest effect on the patch effect when the three types of patch parameters are used together. The failure strength of the patches with the patch parameters optimized is 12.1% higher than that of the unmodified patch and restored to 90.5% .