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Research Papers: Elastohydrodynamic Lubrication

The Effect of Kinematic Conditions on Film Thickness in Compliant Lubricated Contact

[+] Author and Article Information
David Nečas

Faculty of Mechanical Engineering,
Institute of Machine and Industrial Design,
Brno University of Technology,
Technická 2896/2,
Brno 616 69, Czech Republic
e-mail: david.necas@vut.cz

Tomáš Jaroš, Kryštof Dočkal, Petr Šperka, Martin Vrbka, Ivan Křupka, Martin Hartl

Faculty of Mechanical Engineering,
Institute of Machine and Industrial Design,
Brno University of Technology,
Technická 2896/2,
Brno 616 69, Czech Republic

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 1, 2017; final manuscript received February 24, 2018; published online April 10, 2018. Assoc. Editor: Wang-Long Li.

J. Tribol 140(5), 051501 (Apr 10, 2018) (8 pages) Paper No: TRIB-17-1211; doi: 10.1115/1.4039529 History: Received June 01, 2017; Revised February 24, 2018

The present paper deals with an investigation of film formation in compliant lubricated contact. Despite these contacts can be found in many applications of daily life including both biological and technical fields, so far little is known about the lubrication mechanisms inside the contacts. The main attention is paid to the effect of kinematic conditions on central film thickness. For this purpose, fluorescent microscopy method was employed. Experiments were realized in ball-on-disk configuration, while the ball was made from rubber and the disk was from optical glass. The contact was lubricated by glycerol and polyglycol to examine the effect of fluid viscosity. The measurements were conducted under pure rolling and rolling/sliding conditions. The entrainment speed varied from 10 to 400 mm/s and constant load of 0.2 N was applied. Experimental results were compared with two theoretical predictions derived for isoviscous-elastohydrodynamic lubrication (I-EHL) regime. It was found that the thickness of lubricating film gradually increases with increasing entrainment speed, which corresponds to theoretical assumptions. Against expectations, evident influence of slide-to-roll ratio (SRR) on film formation was observed. In the last part of the paper, some limitations of this study are discussed and several recommendations for further methodology improvement are suggested.

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References

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Figures

Grahic Jump Location
Fig. 1

Scheme of the experimental apparatus

Grahic Jump Location
Fig. 2

Film thickness as a function of entrainment speed for rigid EHL contact lubricated by glycerol under pure rolling conditions

Grahic Jump Location
Fig. 3

Pure rolling results for I-EHL contact: (a) film thickness as a function of entrainment speed for the two test lubricants, (b) film thickness profiles for glycerol, inlet is on the left, and (c) images of the contact zone for glycerol at various speeds; inlet is on the left of each image

Grahic Jump Location
Fig. 4

Pure negative sliding results for I-EHL contact: (a) film thickness as a function of entrainment speed for the two test lubricants, (b) film thickness profiles for glycerol, inlet is on the left, and (c) images of the contact zone for glycerol at various speeds; inlet is on the left of each image

Grahic Jump Location
Fig. 5

Pure positive sliding results for I-EHL contact: (a) film thickness as a function of entrainment speed for the two test lubricants, (b) film thickness profiles for glycerol, inlet is on the left, and (c) images of the contact zone for glycerol at various speeds; inlet is on the left of each image

Grahic Jump Location
Fig. 6

Dependence of relative central film thickness on SRR for polyglycol (a) and glycerol (b)

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