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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

Jackson,  A., and Cameron,  A., 1976, “An interferometric Study of the EHL of Rough Surfaces,” ASLE Trans., 19, pp. 50–60.
Wedeven,  L. D., and Cusano,  C., 1979, “Elastohydrodynamic Film Thickness Measurements of Artificially Produced Surface Dents and Grooves,” ASLE Trans., 22(4), pp. 369–329.
Cusano,  C., and Wedeven,  L. D., 1982, “The Effects of Artificially-Produced Defects on the Film Thickness Distribution in Sliding EHD Point Contacts,” ASME J. Lubr. Technol., 104, pp. 365–375.
Kaneta,  M., and Nishikawa,  H., 1994, “Local Reduction in Thickness of Point Contact EHL Films Caused by a Transversely Oriented Moving Groove and Its Recovery,” ASME J. Tribol., 116, pp. 635–639.
Kaneta,  M., Sakai,  T., and Nishikawa,  H., 1992, “Optical Interferometric Observations of the Effects of a Bump on Point Contact EHL,” ASME J. Tribol., 114, pp. 779–784.
Kaneta,  M., Sakai,  T., and Nishikawa,  H., 1993, “Effects of Surface Roughness on Point Contact EHL,” Tribol. Trans., 36, pp. 605–612.
de Silva, G. M. S., Leather, J. A., and Sayles, R. S., 1985, “The Influence of Surface Topography on the Lubricant Film Thickness in an Elastohydrodynamic (EHD) Point Contact,” Proc. 12th Leeds-Lyon Symposium, D. Dowson et al., eds., Butterworths, London, pp. 258–272.
Kaneta,  M., and Cameron,  A., 1980, “Effects of Asperities in Elastohydrodynamic Lubrication,” ASME J. Lubr. Technol., 102, pp. 374–379.
Cann,  P. M., Hutchinson,  J., and Spikes,  H. A., 1996, “The Development of a Spacer Layer Imaging Method (SLIM) for Mapping Elastohydrodynamic Contacts,” Tribol. Trans., 39, pp. 915–921.
Guangteng, G., Cann, P. M., Spikes, H. A., and Olver, A. V., 1999, “Mapping Surface Features in the Thin Film Lubrication Regime,” Proc. 25th Leeds-Lyon Symposium, D. Dowson et al., eds., Elsevier Science B. V., Amsterdam, pp. 175–183.
Guangteng,  G., Cann,  P. M., Olver,  A. V., and Spikes,  H. A., 2000, “Lubricant Film Thickness in Rough Surface, Mixed Elastohydrodynamic Contact,” ASME J. Tribol., 122, pp. 65–76.
Olver, A. V., Guangteng, G., and Spikes, H. A., 2000, “Film Thickness and Pressure in Micro-EHD Contacts,” 26th Leeds-Lyon Symposium on Tribology, D. Dowson et al., eds., Elsevier Science B. V., Amsterdam, pp. 503–510.
Chang,  L., Jackson,  A., and Webster,  M. N., 1994, “Effects of 3-D Surface Topography on the EHL Film Thickness and Film Breakdown,” Tribol. Trans., 37, pp. 435–444.
Hooke, C. J., 1999, “Surface Roughness Modification in EHL Line Contacts—The Effects of Roughness Wavelength, Orientation and Operating Conditions,” Proc. 25th Leeds-Lyon Symposium, D. Dowson et al., eds., Elsevier Science B. V., Amsterdam, pp. 193–202.
Lubrecht,  A. A., and Venner,  C. H., 1999, “Elastohydrodynamic Lubrication of Rough Surfaces,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol., 213, pp. 397–404.
Venner, C. H., Kaneta, M., Nishikawa, H., and Jacod, B., 2000, “Effects of Waviness on the Film Thickness in a Circular EHL Contact Under Rolling/Sliding,” Proc. of the International Tribology Conference, Nagasaki, I , Japanese Society of Tribologists, Tokyo, Japan, pp. 631–636.
Kweh,  C. C., Patching,  M. J., Evans,  H. P., and Snidle,  R. W., 1992, “Simulation of Elastohydrodynamic Contacts Between Rough Surfaces,” ASME J. Tribol., 114, pp. 412–419.
Zhu, D., and Hu, Y. Z., 2000, “Effects of Rough Surface Topography and Orientation on the EHD and Mixed Lubrication Characteristics,” Proc. of the International Tribology Conference, Nagasaki, I , Japanese Society of Tribologists, Tokyo, Japan, pp. 625–630.
Johnston,  G. J., Wayte,  R., and Spikes,  H. A., 1991, “The Measurement and Study of Very Thin Lubricant Films in Concentrated Contacts,” Tribol. Trans., 34, pp. 187–194.
Choo, J. W., Olver, A. V., and Spikes, H. A., 2003, “Influence of Surface Roughness Features on Mixed Film Lubrication,” Lubr. Sci., in press.
Sayles,  R. S., Hamer,  J. C., and Ioannides,  E., 1990, “The Effects of Particulate Contamination in Rolling Bearings—A State of the Art Review,” Proc. Inst. Mech. Eng., 204(G), pp. 29–36.

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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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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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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