Journal of Northeastern University Natural Science ›› 2017, Vol. 38 ›› Issue (10): 1447-1452.DOI: 10.12068/j.issn.1005-3026.2017.10.016

• Mechanical Engineering • Previous Articles     Next Articles

Nonlinear Fractal Model for Static Friction Coefficient Considering Three-Dimensional Topography of Joint Surfaces

PAN Wu-jiu, LI Xiao-peng, WANG Xue, LI Mu-yan   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2016-05-09 Revised:2016-05-09 Online:2017-10-15 Published:2017-10-13
  • Contact: LI Xiao-peng
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Abstract: Considering three-dimensional topography W-M function of joint surfaces, a nonlinear fractal model for static friction coefficient considering three-dimensional topography of joint surfaces was established. Relations between the static friction coefficient considering three-dimensional topography of joint surfaces and normal load, the fractal dimension, fractal roughness were numerically simulated, as well as the difference between static friction coefficients in the two-dimensional fractal model and three dimensional fractal model. The results showed that the static friction coefficient increases monotonically with the increase of normal load, and decreases monotonically with the increase of topothesy. When D is less than 2.5, the static friction coefficient increases with the increase of fractal dimension; when the D is greater than 2.5, the static friction coefficient decreases with the increase of fractal dimension; the three-dimensional fractal static friction coefficient is smaller than that of the two-dimensional.

Key words: three-dimensional topography, joint surfaces, static friction coefficient, fractal theory, nonlinear

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