EHL Performance of the Lubricant With Shear Strength: Part I — Boundary Slippage and Film Failure
作者:
Wen Shizhu,
Zhang Yongbin,
期刊:
Tribology Transactions
(Taylor Available online 2000)
卷期:
Volume 43,
issue 4
页码: 700-710
ISSN:1040-2004
年代: 2000
DOI:10.1080/10402000008982399
出版商: Taylor & Francis Group
关键词: Lubricant Boundary Slippage;Lubrication Failure;Elastohydrodynamic Lubrication
数据来源: Taylor
摘要:
This paper analytically investigates the isothermal line contact elastohydrodynamic lubrication of three lubricants with much different shear strengths under the nondimensional operating parameters of w = 2.15e-4 and U = 2.53e-10 applying the lubricant ideal viscoplastic rheological model. The boundary slippage of the low-shear-strength lubricant occurring in the EHL inlet zone was found and results in a much thinner film compared to the classical EHL theory prediction. The film boundary slippage and its growth with the slide/roll ratio variation of tile low-shear\- strength lubricant exhibit special phenomena, which are much different from those of the high-shear-strength lubricant. The easy occurrence of film failure in concentrated contact in the case of high sliding speed, heavy load, large slide/roll ratio, and low-shear-strength lubricant was concluded due to the severe friction heating on the surface conjunction and the lubricant thermal desorption on tile lubricant/surface boundary. The EHL film failure mechanism was further recognized.
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