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Tribology Letters
Published in: Tribology Letters 2/2019

01-06-2019 | Original Paper

Experimental Study on the Physics of Thick EHL Film Formation with Grease at Low Speeds

Authors: Tsuyoshi Kochi, Masataka Sakai, Takashi Nogi, Daming Dong, Yoshitsugu Kimura

Published in: Tribology Letters | Issue 2/2019

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Abstract

An unexpected behavior of grease in rolling contact has become known among tribologists that it forms thick film at low speeds, but the nature of the film has still been in dispute. The dominance of EHL effects has been demonstrated in the previous works, in which the increase in the generalized viscosity of grease has been reasoned to cause the increase in the film thickness. This paper describes experiments to measure the film thickness with optical interferometry, to observe the flow in and around the contact with microscopy, and to determine the change in the concentration of the thickener by IR spectroscopy. On the basis of these findings, the physics of the thick film formation with grease at low speeds is discussed.
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Appendix
Available only for authorised users
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Metadata
Title
Experimental Study on the Physics of Thick EHL Film Formation with Grease at Low Speeds
Authors
Tsuyoshi Kochi
Masataka Sakai
Takashi Nogi
Daming Dong
Yoshitsugu Kimura
Publication date
01-06-2019
Publisher
Springer US
Published in
Tribology Letters / Issue 2/2019
Print ISSN: 1023-8883
Electronic ISSN: 1573-2711
DOI
https://doi.org/10.1007/s11249-019-1166-7

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