Influence of Texture on Contact Stiffness of Joint Surface Under Mixed Lubrication
Aiming at the contact characteristics of the joint surface including texture morphology under lubricating conditions,a joint surface contact stiffness model based on fractal contact theory is proposed.First,combine the three-dimensional W-M func-tion to establish the mathematical expression of the circular pit texture to characterize the textured rough surface.Secondly,based on the Hertz theory and fractal theory,the contact load and stiffness of the single micro convex at different deformation stages are obtained.On this basis,the contact load and stiffness of the entire joint surface are obtained by combining the texture density ex-pression and area distribution function.Then the liquid contact stiffness of the joint surface is analyzed according to the equivalent thickness obtained from the contact stiffness of the solid elastic contact part.Finally,the mathematical simulation software is used to verify the theoretical model obtained by the coupling of the solid and liquid.The results show that the contact stiffness of the sol-id and liquid in the mixed lubrication state is affected by the fractal parameters,and decreases with the increase of texture density.However,its growth rate will slow down as the texture density increases.
Mixed LubricationContact StiffnessSurface TextureFractal Model
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