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Article

An Anomalous Elastohydrodynamic Lubrication Film: Inlet Dimple

[+] Author and Article Information
F. Guo, P. L. Wong

School of Mechanical Engineering, Qingdao Technological University, 11 Fushun Road, Qingdao 266033, P. R. ChinaDepartment of Manufacturing Engineering and Engineering Management, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, P. R. China

J. Tribol 127(2), 425-434 (Apr 07, 2005) (10 pages) doi:10.1115/1.1866165 History: Received March 01, 2004; Revised December 16, 2004; Online April 07, 2005
Copyright © 2005 by ASME
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References

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Figures

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Optical EHL test apparatus
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Film thickness versus entrainment speed under pure rolling conditions, load=16 N
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EHL interferograms under (a) simple disc sliding and (b) simple ball sliding conditions without ZEVPR, load=16 N, entrainment speed=620.0 μm/s
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EHL films under pure rolling and simple sliding conditions, load=16 N, entrainment speed=432.3 μm/s: (a)–(d) conditions as specified along with the photographs; (e) reconstructed film profiles along central entrainment direction
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Effect of ZEVPR on film thickness under conditions of simple ball sliding and simple disc sliding, load=16 N: (a) central film thickness hcen; (b) outlet minimum film thickness hmin O; (c) dimple film thickness hdim; (d) inlet minimum film thickness hmin I
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Film profiles across entrainment direction at different locations under simple disc sliding with ZEVPR and pure rolling, a is the Hertzian contact radius: (a) x=−0.76a; (b) x=−0.5a; (c) x=0; and (d) x=0.5a
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Inlet dimple and interference patterns at simple disc sliding with ZEVPR
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Film profiles and formation of inlet dimple at different entrainment speeds, load=10.5 N
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Variations of hmin I,hdim,hcen, and hmin O versus entrainment speeds at loads of (a) 7 N, (b) 10.5 N, (c) 16 N, and (d) 22 N
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Depth of inlet dimple versus entrainment speed at loads of 10.5 and 16 N
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Film profiles along the central entrainment direction under different loads; entrainment speed=400.0 μm/s
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Variations of hmin I,hdim,hcen, and hmin O with loads at entrainment speeds of (a) 200.0 μm/s, (b) 400.0 μm/s, and (c) 700.0 μm/s
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Depth of inlet dimple versus loads at entrainment speeds of 400.0 and 700.0 μm/s
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Effective viscosity versus shear stress for different rheological models, ηeff: effective viscosity, η: zero-shear-rate viscosity, τ: shear stress, τL: limiting shear stress
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Schematic illustration of non-Newtonian viscosity wedge and its effect on lubricant flow: (a) dimensionless effective viscosity distribution, and (b) velocity profile across the film

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