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TECHNICAL PAPERS

Mixed Lubrication Analyses by a Macro-Micro Approach and a Full-Scale Mixed EHL Model

[+] Author and Article Information
Q. Jane Wang

Mechanical Engineering, Northwestern University, Evanston, IL 60208  

Dong Zhu

Eaton Corporation, 26201 Northwestern Highway, Southfield, MI 48037  

Herbert S. Cheng, Tonghui Yu, Xiaofei Jiang, Shuangbiao Liu

Mechanical Engineering, Northwestern University, Evanston, IL 60208

J. Tribol 126(1), 81-91 (Jan 13, 2004) (11 pages) doi:10.1115/1.1631017 History: Received December 11, 2002; Revised May 13, 2003; Online January 13, 2004
Copyright © 2004 by ASME
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References

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Figures

Grahic Jump Location
Description of a mixed-EHL problem: (a) two bodies in contact and lubrication; and (b) asperity interactions.
Grahic Jump Location
The contact between two nominally flat surfaces: (a) two rough half-spaces; (b) a composite surface versus a rigid half-space; (c) a pre-deformed composite surface versus a rigid half-space used in Ren and Lee’s model; (d) a given average pressure is produced from contact (c); and (e) a half-space with a periodic roughness versus a rigid half-space solved by the CC-FT method.
Grahic Jump Location
Comparison between the Ren-Lee asperity model and the CC-FT asperity model
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Three typical rough surfaces: (a) a rough surface with isotropic asperities; (b) a rough surface with transverse asperities; and (c) a rough surface with longitudinal asperities.
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Pressure distributions calculated by the full-scale mixed EHL model and the micro-macro EHL model (isotropic rough surface, W=800 N,Rq=0.4 μm): (a) involving lighter asperity contact (by the full-scale mixed EHL model, left, and the micro-macr EHL model, (right); and (b) involving heavier asperity contact (by the full-scale mixed EHL model, left, and the micro-macro EHL model, right).
Grahic Jump Location
Film thickness distributions calculated by the full-scale mixed EHL model and the micro-macro EHL model (isotropic rough surface, W=800 N,Rq=0.4 μm): (a) involving lighter asperity contact (by the full-scale mixed EHL model, left, and the micro-macro EHL model, right); (b) involving heavier asperity contact (by the full-scale mixed EHL model, left, and the micro-macro EHL model, right).
Grahic Jump Location
Central film thickness and pressure calculated by the full-scale mixed EHL model and the micro-macro EHL model as a function of rolling velocity (isotropic rough surface, W=800 N,Rq=0.4 μm).
Grahic Jump Location
Variations of the average central film thickness as a function of rolling speed (W=800 N,Rq=0.4 μm): (a) isotropic surface; (b) transverse surface; and (c) longitudinal surface.
Grahic Jump Location
Variations of the average central film thickness as a function of roughness (W=800 N,U=625 mm/s): (a) isotropic roughness effect; (b) transverse roughness effect; and (c) longitudinal roughness effect.
Grahic Jump Location
Central film thickness and pressure distributions calculated by the full-scale mixed EHL model and the micro-macro EHL model as a function of roughness variation (isotropic surface, W=800 N,U=625 mm/s)
Grahic Jump Location
The effect of load (isotropic surface, Rq=0.4 μm, load W=20∼3200 N,U=0.625 m/s)

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