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Research Papers: Elastohydrodynamic Lubrication

Influence of Lubricant Inlet Film Thickness on Elastohydrodynamically Lubricated Contact Starvation

[+] Author and Article Information
David Kostal

Assistant Professor
Institute of Machine Design,
Faculty of Mechanical Engineering,
University of Technology,
Technicka 2/2896, Brno 63600, CZE
e-mail: kostal@fme.vutbr.cz

Petr Sperka

Assistant Professor
Institute of Machine Design,
Faculty of Mechanical Engineering,
University of Technology,
Technicka 2/2896, Brno 63600, CZE

Petr Svoboda

Associate Professor
Institute of Machine Design,
Faculty of Mechanical Engineering,
University of Technology,
Technicka 2/2896, Brno 63600, CZE

Ivan Krupka, Martin Hartl

Professor
Institute of Machine Design,
Faculty of Mechanical Engineering,
University of Technology,
Technicka 2/2896, Brno 63600, CZE

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 23, 2016; final manuscript received December 29, 2016; published online May 26, 2017. Assoc. Editor: Wang-Long Li.

J. Tribol 139(5), 051503 (May 26, 2017) (6 pages) Paper No: TRIB-16-1276; doi: 10.1115/1.4035777 History: Received August 23, 2016; Revised December 29, 2016

The paper deals with an experimental study of an elastohydrodynamic contact under insufficient lubricant supply. Theoretical studies published in this research area focus mainly on the development of theoretical models, and there is a lack of experimental validation of the theoretical models. This paper presents original experimental results and aims to describe the starvation severity level as a function of the inlet film thickness and contact geometry. Experimental data are compared with an analytical model for point contacts published by Chevalier. The study was also extended to elliptical contacts to achieve a comparison with the different parameters of the side-flow resistance used by Damiens. Both models agree well with the experiments.

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References

Wolveridge, P. , Baglin, K. , and Archard, J. , 1970, “ The Starved Lubrication of Cylinder in Line Contact,” Proc. Inst. Mech. Eng., 185(1), pp. 1159–1169. [CrossRef]
Hamrock, B. , and Dowson, D. , 1977, “ Isothermal Elastohydrodynamic Lubrication of Point Contacts. Part 4—Starvation Results,” Trans. ASME, Ser. F: J. Lubr. Technol., 99(1), pp. 15–23. [CrossRef]
Hamrock, B. , and Dawson, D. , 1977, “ Isothermal Elastohydrodynamic Lubrication of Point Contact. Part III—Fully Flooded Results,” Trans. ASME, Ser. F: J. Lubr. Technol., 99(2), pp. 264–276. [CrossRef]
Chevalier, F. , Lubrecht, A. , Cann, P. , Colin, F. , and Dalmaz, G. , 1998, “ Film Thickness in Starved EHL Point Contacts,” ASME J. Tribol., 120(1), pp. 126–132. [CrossRef]
Damiens, B. , Venner, C. , Cann, P. , and Lubrecht, A. , 2004, “ Starved Lubrication of Elliptical EHD Contacts,” ASME J. Tribol., 126(1), pp. 105–111. [CrossRef]
Svoboda, P. , Kostal, D. , Krupka, I. , and Hartl, M. , 2013, “ Experimental Study of Starved EHL Contacts Based on Thickness of Oil Layer in the Contact Inlet,” Tribol. Int., 67, pp. 140–145. [CrossRef]
Kostal, D. , Sperka, P. , Svoboda, P. , Krupka, I. , and Hartl, M. , 2015, “ Experimental Observation of Elastohydrodynamically Lubricated Contacts Replenishment,” MM Sci. J., 2015(03), pp. 640–644. [CrossRef]
Kostal, D. , Necas, D. , Sperka, P. , Svoboda, P. , Krupka, I. , and Hartl, M. , 2015, “ Lubricant Rupture Ratio at Elastohydrodynamically Lubricated Contact Outlet,” Tribol. Lett., 59(3), pp. 1–9. [CrossRef]
Hartl, M. , Krupka, I. , and Liska, M. , 1997, “ Differential Colorimetry: Tool for Evaluation of Chromatic Interference Patterns,” Opt. Eng., 36(9), pp. 2384–2391. [CrossRef]
Hartl, M. , Krupka, I. , Poliscuk, R. , Liska, M. , Molimard, J. , Querry, M. , and Vergne, P. , 2001, “ Thin Film Colorimetric Interferometry,” Tribol. Trans., 44(2), pp. 270–276. [CrossRef]
Bruyere, V. , Fillot, N. , Morales-Espejel, G. E. , and Vergne, P. , 2012, “ A Two-Phase Flow Approach for the Outlet of Lubricated Line Contacts,” ASME J. Tribol., 134(4), p. 041503. [CrossRef]

Figures

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Fig. 1

Pressure profile (dotted line) and film thickness for fully flooded (left) and starved (right) EHL contact

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Fig. 2

Ball-on-disk apparatus with interferometry

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Fig. 3

Principle of controlling and measuring the contact inlet film thickness

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Fig. 4

Photograph of the used apparatus with it's basic features

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Fig. 5

Schematic representation of the contacts and area of interest in subsections

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Fig. 6

Influence of SRR on the lubricant rupture ratio Δ theoretically (full line) and experimentally [8]

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Fig. 7

Sections through the track in the lubricant. Each line corresponds to certain time delay.

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Fig. 8

Starvation level as a function of the inlet film thickness

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Fig. 9

Examples of the difference in contacts' dimensions under the same load for different contact ellipticities k. (a) First contact k = 4, (b) second contact k = 0.44, (c) second contact k = 1, and (d) second contact k = 1.8; white arrow shows rolling direction.

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Fig. 10

Results obtained with varying contact ellipticity as shown in Fig. 9

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