Experimental Investigation of the Elastic–Plastic Contact Area and Static Friction of a Sphere on Flat

[+] Author and Article Information
I. Etsion, O. Levinson, G. Halperin, M. Varenberg

Department of Mechanical Engineering, Technion, Haifa, 32000, Israel

J. Tribol 127(1), 47-50 (Feb 07, 2005) (4 pages) doi:10.1115/1.1843834 History: Received May 05, 2004; Revised August 26, 2004; Online February 07, 2005
Copyright © 2005 by ASME
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Schematic of the experimental system
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Friction force and relative displacement at P=12 N,D=15 mm, and P/Pc=1.3
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Static friction and relative displacement at P=60 N,D=3 mm, and P/Pc=154
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Dimensionless contact area vs dimensionless normal load (copper on steel) for D=3 mm (○), D=5 mm (□), and D=10 mm (▵). The solid and dashed lines represent best fit of experimental data and theoretical prediction (Ref. 6), respectively.
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Photographs of the contact area trace following normal load of P/Pc=220. The arrow in part (b) shows the sliding direction of the steel flat.
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Static friction coefficient vs normal load (copper on sapphire) for D=3 mm (○), D=5 mm (□), and D=15 mm (▵)
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Static friction coefficient vs dimensionless normal load of all the copper sphere diameters on both sapphire (○) and steel (▵) flats
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A comparison of the theoretical results 7 (dashed line), and current experimental results (copper–sapphire (○) and copper–steel (▵) combinations) of the static friction coefficient vs dimensionless normal load



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