The Effect of Thermal Oxygen Aging on the Contact Performance of Rubber Seals
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.
space stationrubber sealingthermal oxygen agingcontact pressurecontact width
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