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TECHNICAL PAPERS

A Scale-Dependent Model for Multi-Asperity Contact and Friction

[+] Author and Article Information
George G. Adams, Sinan Müftü, Nazif Mohd Azhar

Department of Mechanical, Industrial and Manufacturing Engineering, 334 SN, Northeastern University, Boston, MA 02115

J. Tribol 125(4), 700-708 (Sep 25, 2003) (9 pages) doi:10.1115/1.1573232 History: Received September 24, 2002; Revised January 14, 2003; Online September 25, 2003
Copyright © 2003 by ASME
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Figures

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The topography of a rough surface and a smooth flat surface
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Relationship between the dimensionless friction stress and the dimensionless contact radius according to the HK model
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Scaled coefficient of friction (αμ) versus scaled normal force (P/αNGb2) for various values of the friction regime parameter (β), without adhesion (γ=0)
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Scaled coefficient of friction (αμ) versus scaled normal force (P/αNGb2) for various values of the surface roughness parameter (α), with the friction regime parameter given by β=1000, and the surface energy of adhesion parameter given by γ=10−3
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Coefficient of friction (μ) versus the dimensionless normal force (P/NGb2) for various values of the friction regime parameter (β), with the surface roughness parameter given by α=0.01, with adhesion (γ=10−3, solid lines) and without adhesion (γ=0, dashed lines)
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Coefficient of friction (μ) versus the dimensionless normal force (P/NGb2) for various values of the surface energy of adhesion parameter (γ), with the surface roughness parameter given by α=0.01 and the friction regime parameter β=1000
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Dimensionless normal force (P/NGb2) versus dimensionless separation (d/σ), for various values of the surface roughness parameter (α) and the friction regime parameter (β), and with the surface energy of adhesion parameter given by γ=10−3. Dashed lines indicate that the normal force is tensile.
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Dimensionless friction force (F/NGb2) versus dimensionless separation (d/σ), for various values of the surface roughness parameter (α) and the friction regime parameter (β), and with the surface energy of adhesion parameter given by γ=10−3
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Dimensionless average contact pressure (P/E*A) versus dimensionless normal force (P/NGb2), for various values of the surface roughness parameter (α) and the friction regime parameter (β), with the surface energy of adhesion parameter given by γ=10−3 (solid lines), and γ=0 (dashed lines)

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