基于极值分布的硅橡胶泡沫平垫装配应力分散性估计方法

THE DISPERSION CHARACTERIZING METHOD FOR ASSEMBLY STRESS OF SILICONE RUBBER FOAM PAD BASED ON EXTREME VALUE DISTRIBUTION

硅橡胶泡沫材料是一种良好的隔热、减振材料,但其力学性能具有很强的分散性,给装配应力的可靠性分析带来困难.论文采用简化超弹性Ogden模型进行硅泡沫平垫压缩性能的描述,基于获得的性能参数区间,采用蒙特卡罗随机模拟方法,预测了平垫装配应力的分布情况,并采用极值分布进行回归分析.结果表明回归参数置信度较高,可以很好的描述预测装配应力的分布情况.进一步,结合应变不确定性的分析,即可最终完成装配应力的可靠性分析.

The silicone rubber foam is a good material used for heat insulation and vibration reduction,but because of dispersion of its mechanical character,it is difficult to quantify the assemble stress in reliability analysis.Based on reduced hyper-foam Ogden Model,the interval of model parameter is got by test data fitting,and predicted assemble stress distribution is got by Monte-Carlo random simulation method followed,and regression analysis of predicted data estimated by the extreme value distribution is introduced.The predicted assembly stress distribution described by extreme value distribution achieves high confidence.More,combining with strain uncertain quantification,the reliability analysis of assemble stress can be performed.