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采用有限单元法分析复合材料榫槽粘接结构应力分布,确定结构上强度危险区域,发现结构薄弱区域位于胶层上。考虑由于加工工艺引起的结构胶层厚度及胶粘剂材料参数的不确定性,将胶层厚度及胶粘剂材料参数作为随机变量,分别采用Monte-Carlo法、二次响应面法、改进的一次二阶矩法和重要抽样法,借助有限元分析软件MSC.Patran/Nastran对榫槽结构进行强度可靠性分析。几种可靠性分析方法分析结果发现:在计算结果近似相等的情况下,蒙特卡罗法计算时间明显长于其他可靠性分析方法,而且二次响应面法和重要抽样法计算结果更接近于蒙特卡罗法计算结果。因此,使用二次响应面法和重要抽样法对结构进行可靠性分析不但可以保证精度,也可以节省计算时间。
The finite element method was used to analyze the stress distribution in the mortise-tenon joint structure of composite materials and the dangerous areas with structural strength were determined. It was found that the weak areas were located on the adhesive layer. Considering the uncertainty of structural adhesive layer thickness and adhesive material parameters caused by the processing technology, taking the adhesive layer thickness and the adhesive material parameters as the random variables, the Monte-Carlo method, the second response surface method, the modified first second moment Method and important sampling method, the strength reliability analysis of mortise and tenon structure is carried out with the aid of finite element analysis software MSC.Patran / Nastran. Several reliability analysis method analysis results show that: in the case of approximately equal calculation results, the Monte Carlo calculation time is significantly longer than other reliability analysis methods, and the second response surface method and important sampling method results closer to the Monte Carlo Luo method calculation results. Therefore, using the secondary response surface method and the important sampling method to carry on the reliability analysis of the structure not only can guarantee the precision, but also can save the computational time.