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TECHNICAL PAPERS

Analysis of Mixed Lubrication Effects in Simulated Gear Tooth Contacts

[+] Author and Article Information
M. J. A. Holmes, H. P. Evans, R. W. Snidle

Cardiff School of Engineering, Cardiff CF24 0YF, UK

J. Tribol 127(1), 61-69 (Feb 07, 2005) (9 pages) doi:10.1115/1.1828452 History: Received February 23, 2004; Revised August 16, 2004; Online February 07, 2005
Copyright © 2005 by ASME
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References

Dowson, D., and Higginson, G. R., Elastohydrodynamic Lubrication, Pergamon, Oxford, 1966.
Holmes,  M. J. A., Hughes,  T. G., Evans,  H. P., and Snidle,  R. W., 2003, “Transient Elastohydrodynamic Point Contact Analysis Using a New Coupled Differential Deflection Method: Part 1 Formulation and Validation,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol., 217, pp. 289–303.
Holmes,  M. J. A., Hughes,  T. G., Evans,  H. P., and Snidle,  R. W., 2003, “Transient Elastohydrodynamic Point Contact Analysis Using a New Coupled Differential Deflection Method: Part 2 Results,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol., 217, pp. 305–321.
Evans,  H. P., and Snidle,  R. W., 1996, “A Model For Elasto-Hydrodynamic Film Failure in Contacts Between Surfaces Having Transverse Finish,” Trans. ASME, J. Tribol., 118, pp. 847–857.
Patching,  M. J., Kweh,  C. C., Evans,  H. P., and Snidle,  R. W., 1995, “Conditions For Scuffing Failure of Ground and Super-Finished Steel Disks at High Sliding Speeds Using a Gas Turbine Engine Oil,” Trans. ASME, J. Tribol., 117, pp. 482–489.
Sharif,  K. J., Kong,  S., Evans,  H. P., and Snidle,  R. W., 2001, “Contact and Elastohydrodynamic Analysis of Worm Gears: Part 1 Theoretical Formulation,” Proc. Inst. Mech. Eng., Part C: J. Mech. Eng. Sci., 215, pp. 817–830.
Evans,  H. P., and Hughes,  T. G., 2000, “Evaluation of Deflection in Semi-Infinite Bodies by a Differential Method,” Proc. Inst. Mech. Eng., Part C: J. Mech. Eng. Sci., 214, pp. 563–584.
Holmes, M. J. A., Transient Analysis of the Point Contact Elastohydrodynamic Lubrication Problem Using Coupled Solution Methods, Ph.D. thesis, Cardiff University.
Holmes, M. J. A., Evans, H. P., and Snidle, R. W., 2003, “Comparison of Transient EHL Calculations With Start-Up Experiments,” Proc. 29th Leeds–Lyon Tribology Symposium, Elsevier, pp. 79–89.
Glovnea,  R. P., and Spikes,  H. A., 2001, “Elastohydro-Dynamic Film Formation at the Start Up of the Motion,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol., 215, pp. 125–138.
Tao, J., Hughes, T. G., Evans, H. P., and Snidle, R. W., 2002, “Elastohydrodynamic Response of Transverse Ground Gear Teeth,” Proc. 28th Leeds–Lyon Symp. on Tribology, Elsevier, Amsterdam.
Elcoate,  C. D., Hughes,  T. G., Evans,  H. P., and Snidle,  R. W., 2001, “Transient Elastohydrodynamic Analysis Using a Novel Coupled Differential Deflection Method,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol., 215, pp. 319–337.

Figures

Grahic Jump Location
Profiles adopted for the surfaces used in the numerical investigation. Profiles are offset for clarity and oriented with metal below the curves.
Grahic Jump Location
Pressure/GPa (upper figure) and film thickness/μm contours of the smooth surface result for the conditions analyzed. Central and minimum film thicknesses are 0.48 and 0.42μm, respectively. The heavy curve indicates a Hertzian dry contact area.
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Pressure (heavy curve) and film thickness on the entrainment axis, y=0, at one timestep in the analysis of contact between two surfaces having Profile (C) with ξ=0.25. Also shown are the two rough surfaces in their contact configuration offset for clarity.
Grahic Jump Location
Contours of contact count rate Q/ms for the transient analysis of two surfaces each having Profile (C). The heavy curve indicates a Hertzian dry contact area.
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Contours of contact count rate Q/ms for the transient analysis of two surfaces each having Profile (B). The heavy curve indicates a Hertzian dry contact area.
Grahic Jump Location
Contours of contact count rate Q/ms for the transient analysis of two surfaces each having Profile (A). The heavy curve indicates a Hertzian dry contact area.
Grahic Jump Location
Contours of contact count rate Q/ms for the transient analysis of two surfaces one having Profile (A) and one with Profile (C). The heavy curve indicates a Hertzian dry contact area.
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Contours of contact count rate Q/ms for the transient analysis of a surface having Profile (C) running against (a) a smooth surface, (b) a smooth surface with the roughness scaled by a factor of (√2), (c) another surface having Profile (C). The heavy curve indicates a Hertzian dry contact area.
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A photograph of a test disk taken from the experiential scuffing program 5 showing a track subject to scuffing damage. Also shown is the Hertzian contact ellipse for the operating load at which scuffing occurred.
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A comparison of line and point contact center line pressure (heavy curve) and film thickness results which are superimposed in the figure for one timestep in the contact of two surfaces having Profile (A) with ξ=0.25. Also shown are the two rough surfaces in their contact configuration, offset for clarity. The line contact results are shown with dotted curves.
Grahic Jump Location
Contours of contact count rate Q/ms for the transient analysis of two surfaces having Profile (C) with ξ=0.25 with aspect ratios (a) a/b=0.25, (b) a/b=1, (c) a/b=4. The heavy curve indicates a Hertzian dry contact area.
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A comparison of the rough surfaces in their deflected contact position at one timestep of the analysis leading to Fig. 11; (a) a/b=4, (b) a/b=1, (c) a/b=0.25
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A comparison of pressure distributions obtained at the same timestep as Fig. 12. The upper profile is for a/b=4 and is offset by 4 GPa for clarity; the middle profile is for a/b=1 and is offset by 2 GPa; the lower profile is for a/b=0.25.
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Film thickness contours and calculated flow vectors for a region comprising three composite asperities near the transverse boundary of a contact. The Hertzian boundary is illustrated by the superimposed curve.
Grahic Jump Location
Contours of contact count rate Q/ms for the transient analysis of two surfaces having Profile (C) with ξ=0.25, with a transverse waviness of wavelength 0.32b applied to each rough surface, and with waviness amplitudes of (a) 0.05 μm, (b) 0.1 μm, (c) 0.2 μm, (d) 0.3 μm, (e) 0.4 μm, (f) 0.5 μm. The heavy curve indicates a Hertzian dry contact area.

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