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TECHNICAL PAPERS

Analysis of EHL Circular Contact Shut Down

[+] Author and Article Information
Jiaxin Zhao, Farshid Sadeghi

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288

J. Tribol 125(1), 76-90 (Dec 31, 2002) (15 pages) doi:10.1115/1.1481366 History: Received August 07, 2001; Revised March 07, 2002; Online December 31, 2002
Copyright © 2003 by ASME
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References

Gohar,  R., and Cameron,  A., 1963, “Optical Measurement of Oil Film Thickness Under EHD Lubrication,” Nature (London), 200, pp. 458–459.
Koye,  K. A., and Winer,  W. O., 1981, “An Experimental Evaluation of the Hamrock and Dowson Minimum Film Thickness Equation for Fully Flooded EHD Point Contacts,” ASME J. Lubr. Technol., 103, pp. 284–294.
Smeeth,  M., and Spikes,  H. A., 1997, “Central and Minimum Elastohydrodynamic Film Thickness at High Contact Pressure,” ASME J. Tribol., 119, pp. 291–296.
Glovnea,  R. P., and Spikes,  H. A., 2001, “Elastohydrodynamic Film Collapse During Rapid Deceleration. Part I: Experimental Results,” ASME J. Tribol., 123, pp. 254–261.
Hamrock,  B. J., and Dowson,  D., 1976, “Isothermal Elastohydrodynamic Lubrication of Point Contact: Part I—Theoretical Formulation,” ASME J. Lubr. Technol., 98, pp. 223–229.
Hamrock,  B. J., and Dowson,  D., 1976, “Isothermal Elastohydrodynamic Lubrication of Point Contact: Part II—Ellipticity Parameter Results,” ASME J. Lubr. Technol., 98, pp. 375–383.
Lubrecht, A. A., 1987, “Numerical Solution of the EHL Line and Point Contact Problem Using Mulligrid Techniques,” Ph.D. thesis, University of Twente, Enschede, The Netherlands, ISBN 90-9001583-3.
Venner, C. H., 1991, “Multilevel Solution of the EHL Line and Point Contact Problems,” Ph.D. thesis, “University of Twente, Enschede, The Netherlands, ISBN 90-9003974-0.
Venner,  C. H., 1994, “Higher-Order Multilevel Solvers for the EHL Line and Point Contact Problem,” ASME J. Tribol., 116, pp. 741–750.
Brandt,  A., and Lubrecht,  A. A., 1990, “Multilevel Matrix Multiplication and Fast Solution of Integral Equations,” J. Comput. Phys., 90, pp. 348–370.
Stanley,  H. M., and Kato,  T., 1997, “An FFT-Based Method for Rough Surface Contact,” ASME J. Tribol., 119, pp. 481–485.
Venner,  C. H., and Lubrecht,  A. A., 1994, “Numerical Simulation of a Transverse Ridge in a Circular EHL Contact Under Rolling/Sliding,” ASME J. Tribol., 116, pp. 751–761.
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.
Kim,  K., and Sadeghi,  F., 1991, “Non-Newtonian Elastohydrodynamic Lubrication of Point Contact,” ASME J. Tribol., 113, pp. 703–711.
Kim,  K., and Sadeghi,  F., 1993, “Three-Dimensional Temperature Distribution in EHD Lubrication: Part II—Point Contact and Numerical Formulation,” ASME J. Tribol., 115, pp. 36–45.
Zhao,  J., Sadeghi,  F., and Hoeprich,  M. H., 2001, “Analysis of EHL Circular Contact Start Up: Part I—Mixed Contact Model with Pressure and Film Thickness Results,” ASME J. Tribol., 123, pp. 67–74.
Zhao,  J., Sadeghi,  F., and Hoeprich,  M. H., 2001, “Analysis of EHL Circular Contact Start Up: Part II—Surface Temperature Rise Model and Results,” ASME J. Tribol., 123, pp. 75–82.
Glovnea,  R. P., and Spikes,  H. A., 2001, “Elastohydrodynamic Film Formation at the Start-Up of the Motion,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol., 215, pp. 125–138.
Glovnea,  R. P., and Spikes,  H. A., 2000, “The Influence of Lubricant Upon EHD Film Behavior During Sudden Halting of Motion,” Tribol. Trans., 43, pp. 731–739.
Sugimura,  J., Jones,  W. R., and Spikes,  H. A., 1998, “EHD Film Thickness in Non-Steady State Contacts,” ASME J. Tribol., 120, pp. 442–452.
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Figures

Grahic Jump Location
Change of contact parameters in the second stage of EHL shut down: um0=0.4 m/s,a=100 m/s2
Grahic Jump Location
Comparison with Measurements by Glovnea and Spikes: um0=0.4 m/s(η0=0.245 Pa⋅s,α=2.66×10−8 Pa−1)
Grahic Jump Location
Change of contact parameters with different grid size and time step: um0=0.4 m/s,a=100 m/s2
Grahic Jump Location
Pressure and film thickness distributions on the symmetry line y=0 with different grid size and time step: um0=0.4 m/s,a=100 m/s2
Grahic Jump Location
Pressure and film thickness distributions on the symmetry line y=0 at t=0.1s:um0=0.4 m/s,a=100 m/s2
Grahic Jump Location
Pressure and film thickness distributions on the symmetry line y=0 at t=0.4s:um0=0.4 m/s,a=100 m/s2
Grahic Jump Location
Volume of lubricant trapped in the contact area in the second stage of EHL shut down: um0=0.4 m/s,a=100 m/s2
Grahic Jump Location
Comparison of steady state results
Grahic Jump Location
Pressure and film thickness of EHL shut down process: um0=0.4 m/s,a=100 m/s2 (solid line for y=0, along rolling direction; dashed line for x=0, across rolling direction)
Grahic Jump Location
Change of contact parameters during EHL shut down process: um0=0.4 m/s,a=100 m/s2
Grahic Jump Location
Film thickness change during the first stage of EHL shut down: um0=0.4 m/s,a=100 m/s2 (ξ=−1.1b for central film thickness, ξ=−0.8b for minimum film thickness)
Grahic Jump Location
Film thickness distribution along symmetry line y=0 during the first stage of EHL shut down: um0=0.4 m/s,a=100 m/s2
Grahic Jump Location
Effects of initial steady state surface mean velocity in the first stage of EHL shut down: a=100 m/s2
Grahic Jump Location
Effects of deceleration rate in the first stage of EHL shut down: um0=0.4 m/s
Grahic Jump Location
Central and minimum film thicknesses at the end of the first stage of EHL shut down
Grahic Jump Location
Effects of deceleration rate in the second stage of EHL shut down: um0=0.4 m/s
Grahic Jump Location
Effects of lubricants in the second stage of EHL shut down: um0=0.4 m/s,a=100 m/s2
Grahic Jump Location
Film thicknesses distribution on the symmetry line y=0 at t=0.1s with different lubricants: um0=0.4 m/s,a=100 m/s2

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