基于全试验设计方法的含裂纹铝合金板复合材料修补参数优化

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%。

Optimisation of composite repair parameters for cracked aluminum alloy plate with the design of experimental design method

A three-dimensional finite element model of the adhesively bonding composite repair structure for cracked aluminum alloy plate was established,and the stress intensity factors around the crack tips were calculated based on the displacement extrapolation method.The run of different uniaxial tension test simulations based on ex-perimental design methods allows us to analyze the effect of different repair parameters on stress intensity factor (SIF),such as the patch length,path thickness and adhesive elastic modulus.The most effective parameter and an optimization of repair operation were achieved by analyzing the SIF using quadratic equation.The finite element re-sults were subjected to the uniaxial tension test.The results show that the patch length is the most effective parame-ter when the above three factors act at the same times,the failure strength of the repaired plate is increased by 12.1% compared with that of the unrepaired plate,restoring to 90.5% of that of unrepaired plate without cracks.