基于步进应力加速老化和改进Arrhenius模型的橡胶贮存寿命预测

Rubber storage life prediction based on step stress accelerated test and a modified Arrhenius model

为准确、快速地预测橡胶的贮存寿命,在步进高温应力加速老化试验的基础上,对不同加速温度下的加速系数进行计算,获得加速因子和绝对温度倒数的曲线,发现橡胶老化过程表现出非Arrhenius特性。针对非Arrhenius特性,引入幂指数因子,采用一种改进的Arrhenius模型对加速系数进行拟合。由对数反应速率与绝对温度倒数曲线的斜率,计算了改进Arrhenius模型在不同温度下的等效线性活化能,结果表明低温下活化能减小。建立低温下的老化寿命模型,对胶料在10℃,20℃和30℃下的老化寿命进行评估。评估结果表明,该模型可为相关高分子材料腐蚀过程中呈现的非Arrhenius特性的分析及寿命预测提供参考。

In order to accurately and quickly predict the storage life of rubber,the acceleration coefficients at different acceleration temperatures are calculated based on the stepping stress accelerated aging test of high temperature,and the acceleration factor and absolute temperature reciprocal curve was obtained.For the non-Arrhenius characteristic,a power exponential factor was introduced,and a modified Arrhenius model was employed to fit the acceleration coefficient.From the slope of the logarithmic reaction rate and the absolute temperature reciprocal curve,the equivalent linear activation energy of the modified Arrhenius model at different temperature was calculated,which indicated that the activation energy decreased at low temperature.The aging life model at low temperature was established and the aging life of the rubber at 10℃,20℃and 30℃was evaluated respectively.Evaluation result shows that,it can provide reference for non-Arrhenius analysis and life prediction in the corrosion process of related polymer materials.