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TECHNICAL PAPERS

Influence of a Surface Bump or Groove on the Lubricating Performance and Dimple Phenomena in Simple Sliding Point EHL Contacts

[+] Author and Article Information
Peiran Yang, Jinlei Cui

Department of Mechanical Engineering, Qingdao Institute of Architecture and Engineering, Qingdao 266033, China

Motohiro Kaneta, Hiroshi Nishikawa

Department of Mechanical and Control Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan

J. Tribol 126(3), 466-472 (Jun 28, 2004) (7 pages) doi:10.1115/1.1691434 History: Received September 26, 2002; Revised July 15, 2003; Online June 28, 2004
Copyright © 2004 by ASME
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Figures

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Solutions for the cases of perfectly smooth surfaces: (a) α=4×10−8 Pa−1, (b) α=3×10−8 Pa−1, and (c) α=2×10−8 Pa−1.
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Influence of the location X0 of a transversely oriented bump on the shape of the film and the distributions of pressure and film thickness on the plane of Y=0:α=4×10−8 Pa−1,A=1 μm, and L=30 μm.
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Experimental results of a transversely oriented bump at various locations (central locations of bumps are about −0.21 mm, −0.04 mm, 0.06 mm, and 0.16 mm, respectively): the height of the bump is 0.6 μm, the width of the bump is about 30 μm, the lubricant is Santotrac 100 oil, R=12.7 mm,w=39.2 N(pH=0.54 GPa),ug=500 mm/s,us=0.1 mm/s, and t0=294.5 K (21.5°C).
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Influence of an inlet bump on the shape of the film and the distributions of pressure and film thickness on the plane of Y=0:α=3×10−8 Pa−1,X0=−0.8,A=1 μm, and L=30 μm.
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Experimental results of an inlet bump (central location of the bump is about −0.15 mm): the operating conditions are the same as those for Fig. 3.
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Effect of the height of a transversely oriented bump on the distributions of film thickness and pressure on the plane of Y=0:α=4×10−8 Pa−1,X0=0, and L=30 μm.
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Effect of the width of a transversely oriented bump on the distributions of film thickness and pressure on the plane of Y=0:α=4×10−8 Pa−1,X0=0, and A=1 μm.
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Film thickness contour maps and pressure and film thickness distributions on the plane of Y=0 given by the numerical solutions for a transversely oriented groove at various locations: α=4×10−8 Pa−1,A=1 μm, and L=30 μm.
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Numerical results for the case of a transversely oriented, wide and deep groove: α=2×10−8 Pa−1,X0=−0.1,A=1.8 μm, and L=50 μm.
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Numerical results for the EHL contact with a centrally located longitudinal bump, α=3×10−8 Pa−1,A=0.5 μm, and L=30 μm: (a) film thickness, (b) pressure, and (c) map of the film thickness contours.
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Numerical results for the EHL contact with a centrally located longitudinal groove, α=4×10−8 Pa−1,A=1 μm, and L=30 μm: (a) film thickness, (b) pressure, and (c) map of the film thickness contours.

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