热氧老化效应对橡胶密封接触性能的影响*

doi:10.13385/j.cnki.vacuum.2024.03.06

摘要/Abstract

摘要： 橡胶密封结构的寿命对空间站在轨长期运行至关重要。本文以三元乙丙橡胶（EPDM）密封为研究对象,首先测试热氧老化试验后橡胶应力-应变本构关系及橡胶的压缩永久变形,然后基于时温等效理论建立热氧老化影响下的密封性能理论模型,实现长服役期内橡胶密封性能的分析。运用此模型研究了老化性能变化指标对EPDM与钛合金（TC4）、EPDM与聚酰亚胺（PI）两种接触副间宏观接触性能的影响规律。结果表明：热氧老化性能变化指标减小时,两种橡胶密封宏观接触压力和接触宽度均随之减小;相同老化性能指标下,橡胶密封EPDM与PI接触副间的接触宽度以及接触压力均大于EPDM和TC4接触副间的接触压力和接触宽度。

关键词: 空间站, 橡胶密封, 热氧老化, 接触压力, 接触宽度

Abstract: The lifespan of rubber sealing structures plays a crucial role in the long-term operation of space stations in orbit. In this study, EPDM sealing was taken as the research object. First and foremost, the stress-strain constitutive relationship of the rubber after thermal oxidation experiment and the compression permanent deformation of the rubber were tested. Secondly, based on the theory of time temperature equivalence, a theoretical model of sealing performance under the influence of thermal oxygen aging was established to analyze the sealing performance of rubber over a long service life. Besides, this model was used to study the impact of aging performance changes on the macroscopic contact performance between EPDM and titanium alloy (TC4), EPDM and polyimide (PI) contact pairs. The results show that the reduction in thermal oxygen aging performance indicators will result in decrease in the macroscopic contact pressure and contact width of rubber seals. Under the same aging performance indicators, the contact width and contact pressure between EPDM and PI contact pair of rubber seals are greater than those between EPDM and TC4 contact pair.

Key words: space station, rubber sealing, thermal oxygen aging, contact pressure, contact width

中图分类号: TB79

郭崇武, 史纪军, 孙立臣, 齐飞飞, 李文斌. 热氧老化效应对橡胶密封接触性能的影响^*[J]. 真空, 2024, 61(3): 33-39.

GUO Chong-wu, SHI Ji-jun, SUN Li-chen, QI Fei-fei, LI Wen-bin. The Effect of Thermal Oxygen Aging on the Contact Performance of Rubber Seals[J]. VACUUM, 2024, 61(3): 33-39.

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