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TECHNICAL PAPERS

On the Sensitivity of the Asperity Pressures and Temperatures to the Fluid Pressure Distribution in Mixed-Film Lubrication

[+] Author and Article Information
L. Chang, Yongwu Zhao

Department of Mechanical Engineering, Penn State University, University Park, PA 16802

J. Tribol 122(1), 77-85 (Jun 10, 1999) (9 pages) doi:10.1115/1.555331 History: Received January 21, 1999; Revised June 10, 1999
Copyright © 2000 by ASME
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References

Chang,  L., 1995, “A Deterministic Model for Partial Elastohydrodynamic Lubrication,” Tribol. Int., 28, No. 2, pp. 75–83.
Jiang,  X., Cheng,  H. S., Hua,  D., Ai,  X., and Lee,  S., 1999, “A Mixed Elastohydrodynamic Lubrication with Asperity Contacts,” ASME J. Tribol., 121, pp. 481–491.
Qiu,  L., and Cheng,  H. S., 1998, “Temperature Rise Simulation of Three-Dimensional Rough Surfaces in Mixed Lubricated Contact,” ASME J. Tribol., 120, No. 2, pp. 310–318.
Carslaw, H. S., and Jaeger, J. C., 1958, Conduction of Heat in Solids, 2nd ed., Oxford at the Clarendon Press, London.
Zhai, X., and Chang, L., 1999, “A Transient Thermal Model for Mixed-Film Contacts,” Tribol. Trans., in press.
Chang,  L., and Zhao,  W., 1995, “Wavelength Dependence of Pressure Rippling in EHL with Random Surface–Roughness Profiles,” Tribol. Trans., 38, No. 2, pp. 389–395.
Chang,  L., and Gao,  Y., 1999, “A Simple Numerical Method for Contact Analysis of Rough Surfaces,” ASME J. Tribol., 121, pp. 425–432.
Johnson,  K. L., and Tevaarwerk,  J. L., 1977, “Shear Behavior of Elastohydrodynamic Oil Films,” Proc. R. Soc. London, Ser. A, 356, pp. 215–236.
Wang,  S., Cusano,  C., and Conry,  T. F., 1991, “Thermal Analysis of Elastohydrodynamic Lubrication of Line Contact Using the Ree-Eyring Model,” ASME J. Tribol., 103, No. 2, pp. 232–244.
Elcoate, C. D., Evans, H. P., Hughes, T. G., and Snidle, R. W., 1998, “Thin Film, Time Dependent, Micro-EHL Solutions with Real Surface Roughness,” Proc. Leeds/Lyon Symp on Tribology, in press.
Ai,  X., and Cheng,  H. S., 1994, “A Transient EHL Analysis for Line Contacts with Measured Surface Roughness Using Multigrid Technique,” ASME J. Tribol., 116, No. 3, pp. 549–558.
Venner,  C. H., and ten Napel,  W. E., 1992, “Surface Roughness Effects in an EHL Line Contact,” ASME J. Tribol., 114, No. 3, pp. 616–622.

Figures

Grahic Jump Location
An animation of the mixed-film contact
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A sample segment of the composite surface roughness
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A time snap-shot of the contacts and pressures (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure (ph=1.5 GPa,u=10.0 m/s,ξ=0.5 and wf=0.95)
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Contact temperatures corresponding to the time instant of Fig. 3 (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure
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Histograms of the asperity pressures (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure (ph=1.5 GPa,u=10.0 m/s,ξ=0.5 and wf=0.95)
Grahic Jump Location
Histograms of the asperity temperatures (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure
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A snap-shot of the contacts and pressures for a more severe problem of wf=0.5 (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure
Grahic Jump Location
Contact temperatures corresponding to the time instant of Fig. 7 (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure
Grahic Jump Location
Histograms of the asperity pressures with wf=0.5 (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure
Grahic Jump Location
Histograms of the asperity temperatures with wf=0.5 (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure
Grahic Jump Location
Statistical mean and maximum values of the asperity pressures for a range of the fluid load support (ph=1.5 GPa,u=10.0 m/s and ξ=0.5) (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure
Grahic Jump Location
Statistical mean and maximum values of the asperity temperatures for a range of the fluid load support (ph=1.5 GPa,u=10.0 m/s and ξ=0.5) (a) with Hertz-like fluid pressure, (b) with micro-EHL fluid pressure
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A sample segment of the composite surface roughness used in Cases C and D

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