Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (7): 55-60,69.doi: 10.3969/j.issn.1000-565X.2016.07.009

• Mechanical Engineering • Previous Articles     Next Articles

Calculation Model of Friction Force of Nano-Scale Rough Surface on the Basis of LJ Potential and Stochastic Processes

ZHU Sheng-guang HUANG Ping   

  1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2015-11-17 Revised:2016-03-04 Online:2016-07-25 Published:2016-06-05
  • Contact: 祝胜光(1982-)，男，博士生，主要从事纳米摩擦学研究 E-mail:119109670@qq.com
  • About author:祝胜光(1982-)，男，博士生，主要从事纳米摩擦学研究
  • Supported by:
    Supported by the National Natural Science Foundation of China (51175182)

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Abstract: On the basis of the potential barrier of contact surfaces and the stochastic properties of contact surface morphology,a new calculation model of sliding friction force loaded on nano-scale rough surface is established.Then,the model is used to numerically calculate the sliding friction force of the same material friction pair with rig- orous stationary process.The results show that the normal load is linear to the mean sliding friction force obtained by the presented model and is exponential to the average surface separation; and that the average normal force in- creases linearly with the standard deviation of roughness height distribution at the same average surface separation.In addition,the calculation results are consistent with the existing research conclusions,which means that the pres- ented model is effective and feasible.With this model,the mean sliding friction force can be predicted according to the distribution parameters of contact interface morphology,material parameters and normal load.

Key words: LJ potential, stochastic process, random rough surface, sliding friction force, surface separation

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