密封用硅橡胶老化过程宏观微观特性相关性

开展了密封用某型硅橡胶胶片试件的热空气加速老化试验,对不同等当老化年份下的试件进行了单向拉伸测试和元素分析,获得了老化过程中应力应变数据以及关键元素浓度变化数据;在不同等当老化年份下宏观力学性能及微观化学数据分析的基础上,研究了本构参数与等当老化时间的函数关系以及老化效应与等当老化时间的函数关系,进而建立了宏观力学行为与微观化学变化的相关性模型。某硅橡胶密封圈的应用表明,基于宏观、微观相关性的本构参数插值,应力应变数据与同批次材料100%应变范围内的最大偏差约为7.6%。

Analysis on pertinence between macroscopical andmicrocosmic performance of silicone rubber

Hot air accelerated aging has been implemented on silicone rubber samples.The stress and strain data and the changes of key elements in concentration of these samples under the equivalent aging days are obtained by uniaxial tension tests and elemental analysis.On the basis of macroscopic mechanical-performance and microcosmic chemical data under the equivalent aging days,the correlations between the equivalent aging days and the constitutive parameters,as well as correlations between the equivalent aging days and the aging effect are studied.Subsequently,a pertinence model of macroscopic mechanical behavior and microcosmic chemical change has been established.Based on the macroscopic and microscopic pertinence of an O-ring of silicone rubber,it has been shown that the largest deviation of the stress and strain data within the scope of 100％ strain range between the constitutive parameters interpolation is 7.6％ for the same batch of materials.