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Comparison of hysteric and adhesive coefficient of friction for rubbers sliding onto self-affine rough surfaces

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1 Author(s)
Palasantzas, George ; Department of Applied Physics, Materials Science Center, University of Groningen Nijenborgh 4, 9747 AG Groningen, The Netherlands

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In this paper we investigate the influence of both the hysteric and adhesive friction for rubber surfaces sliding on self-affine rough surfaces. This type of roughness is described by the roughness amplitude w, the in-plane correlation length ξ, and the roughness exponent H that characterizes the degree of surface irregularity at short length scales (≪ξ). It is shown that beyond the typical roughness parameters w and ξ, which are usually used in describing rough surfaces, the influence of the roughness exponent H should be taken carefully into account in order to properly gauge the contributing frictional mechanisms. Indeed, it is shown that for large roughness exponents (H∼1) and/or small roughness ratios w/ξ≪10-2, the adhesive friction becomes significant at relatively high sliding velocities beyond the maximum of the hysteric component.

Published in:

Journal of Applied Physics  (Volume:97 ,  Issue: 3 )

Date of Publication:

Feb 2005

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