摘要
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。
In the paper, the stress distribution of adhesive tongue-and-groove joints for composite laminates were analyzed with the finite element method, the risk region for strength on the structure is defined, finding that the weak region of the structure is located on the adhesive. By taking the uncertainty of the material properties and thickness of adhesive caused by the processing technology into consideration, using the material properties and thickness of adhesive as random variables, the strength reliability analysis of the adhesive tongue-and-groove joints were completed with the help of MSC. Patran/Nastran by using the Monte-Carlo Method, Quadratic Response Surface Method, Advanced First Order Second Moment Method and Importance Sampling Method. The results of these reliability analysis methods showed that the time used by Monte-Carlo method was longer than that of other methods when the calculation results were approximate equivalent. And the results obtained by Quadratic Response Surface Method and Importance Sampling Method were more approximate to that of Monte-Carlo Method. So, using Second Response Surface Method and Importance Sampling Method to complete the reliabihty analysis of the structure can not only ensure the precision of the computing result, but also save the computing time.
出处
《机械设计》
CSCD
北大核心
2010年第8期61-64,共4页
Journal of Machine Design
关键词
复合材料
榫槽粘接
可靠性分析
计算效率
composite laminates
tongue-and-groove joint
reliability analysis
computational efficiency
