长服役期橡胶密封性能分析与寿命评估

Performance analysis and lifetime evaluation of rubber seal for long term service

摘要: 鉴于在橡胶密封性能分析过程中鲜有考虑长期老化效应影响，文章首先基于时温等效理论，构建考虑热氧老化效应的橡胶密封性能分析理论模型，并采用该模型研究不同压缩率和性能变化指标对橡胶接触性能的影响规律。然后，建立橡胶密封计算的平均接触压力与试验测试的橡胶密封泄漏率间的函数关系，并将采用这一关系预测的橡胶密封的泄漏率与试验测试结果进行对比。最后，拟合橡胶密封泄漏率与老化时间之间的函数关系，经外推，实现对O形橡胶密封寿命的精确预测。

Abstract: The long-term aging is rarely considered in the analysis of the rubber seal performance. This paper establishes a theoretical model of rubber seal performance analysis with consideration of the thermal oxygen aging based on the time-temperature equivalent theory. The influence of the compression rate and the performance change index on the contact performance of the rubber seal is investigated by using the model. The functional relationship is established between the calculated average contact pressure and the tested leakage rate of the rubber seal. The leakage rates, predicted by the function, are compared with the test results. Finally, the fitted relationship between the leakage rate and the aging time is obtained, and an accurate prediction of the rubber seal lifetime can be made by extrapolation.