混合润滑状态下织构对结合面接触刚度的影响  

Influence of Texture on Contact Stiffness of Joint Surface Under Mixed Lubrication

作　　者：朱春霞 常永祥 王德全 杨晓楠 ZHU Chun-xia;CHANG Yong-xiang;WANG De-quan;YANG Xiao-nan(School of Mechanical Engineering Shenyang Jianzhu University,Liaoning Shenyang 110168,China)

机构地区：[1]沈阳建筑大学机械工程学院,辽宁沈阳110168

出　　处：《机械设计与制造》2024年第7期12-17,共6页Machinery Design & Manufacture

基　　金：2018年辽宁省兴辽英才支持计划项目(XLYC1807065);国家自然科学基金-面上项目(51575365)。

摘　　要：针对润滑条件下包含织构形貌的结合面接触特性提出一种基于分形接触理论的结合面接触刚度模型。首先,结合三维W-M函数建立圆形凹坑织构数学表达式,对带有织构的粗糙表面进行表征;其次,基于赫兹理论和分形理论得出单微凸体不同变形阶段的接触载荷和刚度;在此基础上,结合织构密度表达式和面积分布函数得出整个结合面的接触载荷和刚度;然后根据固体弹性接触部分接触刚度所得的等效厚度来分析结合面液体接触刚度;最后,运用数学仿真软件对固、液两部分耦合得出的理论模型进行验证。结果表明,混合润滑状态下的固、液两部分接触刚度均受到分形参数的影响,且随着织构密度的增大而减小,但其增速会随着织构密度的增大而变缓。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 function 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 expression 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 solid 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.

关 键 词：混合润滑 接触刚度 表面织构 分形模型 

分 类 号：TH16[机械工程—机械制造及自动化] TH122