双粗糙面滑动过程摩擦因数的变化分析

Analysis of Friction Coefficient in Sliding Model of Double Rough Surfaces

采用W-M函数建立具有分形特征的三维双粗糙面接触模型,考虑了接触界面间的黏着效应,在滑动速度、法向载荷及界面剪切强度等参数变化下,运用有限元方法探讨了粗糙体在滑动过程中摩擦因数的变化情况。结果显示,滑动速度、法向载荷及界面剪切强度等参数对摩擦因数的变化有一定的影响,边界润滑工况下平均摩擦因数为0.28,无润滑工况下平均摩擦因数为0.713,最大界面剪切强度时的平均摩擦因数为0.73;随着界面剪切强度的减小、法向载荷的增大、滑动速度的增加,滑动摩擦因数有所减小。与相关文献结论或实验结果进行比较,证明了上述结果的正确性。分析结果可为摩擦学设计和摩擦材料的制备提供理论参考。

A three-dimensional W-M fractal sliding model of double rough surfaces was estab-lished,and considering the factors which contained interface shear strength,sliding speed and normal load influenced the whole sliding process.The friction coefficient of sliding processes was analysed using the finite element analysis taking into account adhesion factors in the process of contact.The numerical results show that the average coefficient of friction is as 0.28 under the boundary-lubricate-d,the average coefficient of friction is as 0. 713 under the unlubricated interfaces,the average coeffi-cient of friction is as 0.73 under the max interfacial shear strength.With the decrease of the interface shear strength,the increase of normal load and the increase of sliding velocity,the average coefficient of friction is decreased.Compared with experimental results or related documents,it is concluded that the results are of rationality,these results also provide theoretical reference for the tribological design and preparation of friction materials.