Effect of Surface Roughness on Reciprocating Sealing Performance of Rubber O-ring
A three-dimensional deterministic numerical simulation model of mixed lubrication was established.The mod-el adopted the unified Reynolds equation based on the system method and coupled the solid mechanics analysis,fluid me-chanics analysis and contact mechanics analysis.Non Gaussian rough surfaces were generated,based on the mixed lubrica-tion model,the effects of surface roughness amplitude,autocorrelation length ratio and texture direction on the sealing prop-erties of O-ring reciprocating seal,such as friction,leakage rate,average film thickness and contact area ratio,were investi-gated by using the non-Gaussian rough surface.The results show that with the increase of surface roughness,the friction co-efficient,average film thickness and leakage rate increase.When the Ra increases to a certain value and the contact area of the lubrication area is greater than 40％,the average film thickness and leakage rate begin to decrease.For a rough surface with transverse texture,there is an appropriate y,which makes the comprehensive performance and lubrication state of the seal optimal.When θ=π/10,the friction coefficient reaches the minimum value.
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