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Research Papers: Elastohydrodynamic Lubrication

Experimental and Numerical Investigation of Inlet Dimple in Point and Elliptical Contact Elastohydrodynamic Lubrication Films

[+] Author and Article Information
Xuefeng Wang

School of Mechanical Engineering,
Ningbo University of Technology,
Ningbo 315211, China
e-mail: mewangxf@163.com

Rufu Hu

School of Mechanical Engineering,
Ningbo University of Technology,
Ningbo 315211, China
e-mail: ngyhrf@163.com

Mingjun Wang

School of Mechanical Engineering,
Ningbo University of Technology,
Ningbo 315211, China
e-mail: mjwang1104@126.com

Huanxin Yao

School of Mechanical Engineering,
Ningbo University of Technology,
Ningbo 315211, China
e-mail: hljmdjyhx@163.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 22, 2015; final manuscript received January 12, 2016; published online May 4, 2016. Assoc. Editor: Ning Ren.

J. Tribol 138(3), 031505 (May 04, 2016) (9 pages) Paper No: TRIB-15-1164; doi: 10.1115/1.4032952 History: Received May 22, 2015; Revised January 12, 2016

The experimental observation of the inlet dimple of the elastohydrodynamic lubrication (EHL) film was carried out in point and elliptical contacts, respectively, and then, the numerical analysis under point contacts was conducted. The inlet dimple appears and then moves upstream toward the inlet and finally disappears with the increase of the entrainment speed. In the meantime, the dimple depth increases at the beginning and then decreases. The high load leads to a wide entrainment speed range where dimple exists. The varying range of the entrainment speed corresponding to the dimple appearance is smaller at a smaller included angle between the minor axis of elliptical contact and the entrainment direction.

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References

Figures

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Fig. 4

Appearance and disappearance of the inlet dimple, w = 20 N, S = 2.0, PB2400: (a) interferograms, (b) film profiles along the central entrainment direction, (c) dimple position, and (d) dimple depth

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Fig. 5

Load–speed region of the inlet dimple appearance under ball-on-disk contact, S = 2.0, PB2400

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Fig. 3

Geometry of the elliptical steel roller

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Fig. 2

Schematic diagram of optical EHL test rig

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Fig. 1

Optical EHL experimental principle

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Fig. 6

Effect of the slide–roll ratio on the inlet dimple, PB2400, 16 N: (a) interferograms, (b) dimple appearance zone, (c) dimple depth, and (d) dimple position

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Fig. 7

Film profiles of simple disk sliding and simple ball sliding, w = 12.8 N, ue = 1746 μm/s, PB1300

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Fig. 8

Interferograms under elliptical contact, PB2400, 30 N, S = 2.0

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Fig. 15

Entrainment speed's effect on pressure distribution and film thickness, S = 1.5, w = 15.6 N

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Fig. 9

Effect of the angle between the minor axis and the entrainment direction on the dimple appearance load–speed zone under an elliptical roller–glass disk contact, PB2400

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Fig. 10

Dimple depth and position of elliptical contact, PB2400, 30 N, S = 2.0: (a) dimple depth and (b) dimple position

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Fig. 11

Schematic illustration of the EHL point contacts

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Fig. 12

Entrainment speed's effect on film profile: (a) S = 2.0, w = 15.6 N, (b) S = 0.0, w = 15.6 N, and (c) S = 2.0, w = 2.4 N

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Fig. 13

Dimple depth, S = 2.0, w = 15.6 N

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Fig. 14

Effect of the slide–roll ratio on the film profiles and pressure distributions along the central entrainment direction, w = 15.6 N, ue = 0.36 m/s: (a) film profiles and (b) pressure distributions

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