减振橡胶结构的概率-区间混合动态可靠度分析
首发时间:2014-03-14
摘要:可靠性是评价结构安全性能的重要指标。针对减振橡胶弹性元件的可靠性分析,构造了一种概率-区间混合动态可靠性分析模型,并给出了可靠度的简化和计算方法。以循环载荷作用下的橡胶圆柱体为例,该方法首先考虑材料的黏滞特性推导了循环载荷作用下橡胶圆柱体的温度场,采用过热失效准则构建出其极限状态方程,然后采用概率-区间混合模型描述结构不确定参数,同时考虑材料耐热性能的衰减,建立了橡胶结构动态可靠度分析模型,并将其化简为静态模型,通过高效序列迭代格式得到了橡胶结构可靠度上下界的时变曲线和可靠度随动态应变幅值的变化规律。
关键词: 橡胶结构 概率-区间 区间 动态可靠性 炭黑填充橡胶
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DYNAMIC RELIABILITY ANALYSIS OF SHOCK ABSORPTION RUBBER STRUCTURE WITH PROBABILITY-INTERVAL MIXED UNCERTAINTY
Abstract:Reliability is an important indicator of structures' safety evaluation. For shock absorption rubber, a model of probability - interval mixed dynamic reliability is constructed, and a simplified reliability calculation method is presented. The method firstly derived the temperature field of a rubber cylinder under cyclic loading by taking the viscoelastic property of the material into account. Then a thermal failure criterion, taking into account the reduction of the heat resistance of the material, is used to describe the limit state equation, and the uncertainty parameters are given by a probability-interval mixed model. Finally, the dynamic limit state function is simplified into a time-independent one, and an efficient scheme of sequential iteration to solve the two-layer nesting optimization, and then the upper and lower bound of dynamic reliability for rubber structures is obtained.
Keywords: rubber structure random parameter;interval uncertainty;dynamic reliability;carbon black filled rubber
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