石英纤维/环氧树脂复合材料结构静强度的可靠度计算及全局灵敏度分析

Reliability and global sensitivity analysis for static strength of quartz/epoxy composite

以石英纤维/环氧树脂复合材料结构为研究对象,考虑设计参数的随机性,采用全局灵敏度分析理论,研究了各输入随机因素对石英纤维/环氧树脂复合材料结构静强度响应的影响。首先利用MATLAB和NASTRAN的联合仿真得到各输入变量样本值对应的输出响应值,结合自适应Kriging模型构建极限状态函数的代理模型,在此基础上实现石英纤维/环氧树脂复合材料结构静强度可靠度及各输入变量的不确定性对输出响应及失效概率全局灵敏度的计算,得到输入变量的全局灵敏度排序结果,为工程实际中复合材料结构的优化设计提供一定指导。

Taking the quartz/epoxy composite structure as the object,the global sensitivity theory was adopted to analyze the influences of the input parameters on the strength response of quartz/epoxy composite structure by considering the random characteristics of the input parameters.MATLAB and NASTRAN were combined to obtain the output response after considering all the input parameter randomness,then the adaptive Kriging model was introduced to construct the ultimate surrogate model.On basis of this surrogate model,the reliability of overall strength of the quartz/epoxy composite structure was computed,and the global sensitivity indices reflecting the influences of the input parameters on the output response were also obtained.The importance of the input parameters can be ranked according to the sensitivity results,which can provide guidance information for the design of composite structure.