Fractal Transition Model in Predicting Static Friction Coefficient

Authors: Changfu, Sui¹; Xuanyu, Sheng²

Source: Multidiscipline Modeling in Materials and Structures, Volume 5, Number 4, 2009 , pp. 345-348(4)

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Abstract:

There is a fractal characteristic in most engineering surfaces. Effects of the surface fractal parameters D, G and the material parameter ϕ on the static friction coefficient are discussed. The predicted static friction coefficient increases with the increase of normal load. This coincides with the fact that static friction coefficient is very low under very small normal load condition. Second, a fractal transition model is proposed which takes into account the change of fractal dimension D. The load-contact area relationship based on fractal transition model is not simply an exponential function, and the prediction correlates well with the experimental results. The predicted static friction coefficient based on fractal transition model first increases with the increase of load, and then decrease with the increase of load. The transition point is near D=1.5.

Keywords: FRACTAL; STATIC FRICTION; CONTACT

Document Type: Research article

DOI: http://dx.doi.org/10.1163/157361109789807972

Affiliations: 1: Qinhuangdao Branch Campus, Daqing Petroleum Institute, Qinhuangdao 066004, Hebei Province 2: Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China;, Email: xuanyu@tsinghua.edu.cn

Publication date: 2009-10-01