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中文摘要：
目前对往复运动的O形密封圈密封特性的研究较少，而O形密封圈用于住复动密封时其工况更恶劣。鉴于此，建立了O形密封圈的有限元模型，分析了其在往复动密封中的密封性能，并对影响其动密封特性的运动速度、介质压力、预压缩率和摩擦因数进行了分析。分析结果表明，在往复动密封中，O形密封圈内部应力随时间变化而产生波动，在交变应力作用下比在静密封中更易失效；O形密封圈主接触面的最大接触应力并不随速度的增大而线性变化；预压缩率与摩擦因数对O形密封圈外行程密封性能影响较小，而对其内行程密封性能影响较大；O形密封圈在外行程中的密封性能优于内行程。
英文摘要：
There is relatively little research on the sealing property of O-ring in reciprocating motion. The operat- ing condition is severe when O-ring is used in reciprocating motion. Therefore, the finite element model of O-ring was established. Its sealing property in reciprocating dynamic sealing was analyzed. The motion velocity, medium pressure, pre-compression rate and friction factor which affect the dynamic sealing property of O-ring were analyzed. The findings show that in reciprocating dynamic sealing, the stress within O-ring is of fluctuating variation with time. It is easier to fail than in static sealing due to the effect of alternating stress. The maximum contact stress of O-ring＇ s main contact surface does not change linearly with the increase of velocity. The pre-compression rate and friction factor have slight effect on the sealing property of O-ring＇ s outer stroke, but they have considerable effect on that of its inner stroke. The sealability of O-ring in outer stroke is better than in inner stroke.
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