复合材料层合板结构的概率与非概率模型

Probability and non-probability model of laminated composite plate structures

将非概率模型引入复合材料的可靠性分析,建立了一种包含概率和非概率分析的混合模型.对存在初始缺陷的层合板系统,将初始缺陷等不确定性因素根据所掌握数据的多少分别采用概率和非概率模型来描述,通过Tsai-Wu准则进行强度分析,运用一阶矩方法得到可靠性指标,来评估复合材料层合板系统的可靠性.结果表明,对于那些掌握数据较少,而无法准确描述其分布形式的变量,采用混合模型是一种较好选择.

Non-probability concept was introduced into the reliability analysis of composite materials, and a mixed model for probability and non-probability analysis was built. A laminated composite with initial imperfection was considered, and the uncertain factors were described as the probability variables and the non-probability variables according to their features. The reliability analysis of laminated composite plate structures was evaluated by Tsai-Wu criterion, as the limit state function, based on the first order matrix method. The results show that the mixed mode is good suitable for the variables whose distribution with less data could not be described exactly in the reliability analysis of the structures.