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TECHNICAL PAPERS

The Effects of Three-Dimensional Model Surface Roughness Features on Lubricant Film Thickness in EHL Contacts

[+] Author and Article Information
Jian W. Choo, Romeo P. Glovnea, Andrew V. Olver, Hugh A. Spikes

Tribology Section, Department of Mechanical Engineering, Imperial College of Science, Technology and Medicine, London SW7 2BX, United Kingdom

J. Tribol 125(3), 533-542 (Jun 19, 2003) (10 pages) doi:10.1115/1.1538617 History: Received March 27, 2002; Revised October 22, 2002; Online June 19, 2003
Copyright © 2003 by ASME
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References

Figures

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Spacer Layer Imaging Method (SLIM)
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Comparison of SLIM with ultra-thin film interferometry
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Interferogram of a circular EHL contact under pure rolling conditions where an array of near-hemispherical bumps was sputtered on the steel ball. Inlet on left.
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Profiles along the entrainment direction across a bump in thick film conditions. Pure rolling, Inlet on left. (a) large bump height, (b) intermediate bump height, (c) small bump height.
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Profiles along the entrainment direction across a bump in thin film conditions. Pure rolling, Inlet on left. (a) large bump height, (b) intermediate bump height, (c) small bump height.
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Variation of film thickness with entrainment speed at the peak of a bump and as far away from any bump in the central region of the contact. Thin film conditions, pure rolling.
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Corrected film thickness. 9 nm was added at the center of bumps to compensate for spacer layer compression. Thin film conditions, pure rolling.
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Variation of film thickness with entrainment speed at the peak of a bump and as far away from any bump in the central region of the contact. Thick film conditions, pure rolling.
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Interferograms showing convection of micro-EHL film in rolling-sliding, thin film conditions. +SRR on top row, −SRR on bottom row, MRB3, U=99 mms−1, Inlet on left.
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Interferograms showing the development of a steady-state micro-EHL film in rolling-sliding, thick film conditions. +SRR on left column, −SRR on right column, MRB1, U=99 mms−1, Inlet on left.
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Variation of film thickness with θ=(U⋅η0)Xα0.53, for both lubricants under pure rolling conditions
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Correlation of film thickness at the peak of a bump with central film thickness from a smooth ball test
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Variation of amplitude ratio of bump height with entrainment speed in the central region of the contact, for both lubricants under pure rolling conditions
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Variation of amplitude ratio of bump height with θ=(U⋅η0)Xα0.53, for both lubricants under pure rolling conditions
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Variation of amplitude ratio of bump height with ϕ=(U⋅η0)Xα0.53/(B)1.134−X, for both lubricants under pure rolling conditions

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