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Film thickness build-up in highly loaded lubricated contacts under Zero Entrainment Velocity condition

Bilel Meziane 1, 2
Abstract : Highly loaded lubricated contacts are often studied in rolling/sliding conditions. In those cases, the entrainment of lubricant in a so-called “oil wedge” explains the existence of a separating film thickness. However, in a number of industrial applications, the contact is subjected to opposite surface velocities. In such cases, there is a Zero Entrainment Velocity (defined as the average velocity of the two surfaces) of the fluid. The film thickness prediction formulae developed in the literature for rolling contacts are unusable. In this thesis, the physical phenomena leading to a film build-up under Zero Entrainment Velocity condition are elucidated. A finite element model is used in order to facilitate in-situ measurements. It aims to describe the behaviour of the contact in thermal and transient conditions. In the stationary regime, the numerical values are compared with a very good agreement to a set of results obtained via a tailored experimental campaign. This dual approach enables a quantitative description of the influence of the contact load, surface velocities and external temperature on the film thickness under ZEV condition. Then, the relative influence of the thermal and squeeze effects is studied. Depending on the ratio between the characteristic loading time and the characteristic thermal time, these two effects can show a beneficial synergy for the contact.
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Submitted on : Thursday, July 16, 2020 - 12:30:54 PM
Last modification on : Monday, July 20, 2020 - 5:32:13 PM

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  • HAL Id : tel-02882664, version 2

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Bilel Meziane. Film thickness build-up in highly loaded lubricated contacts under Zero Entrainment Velocity condition. Mechanical engineering [physics.class-ph]. Université de Lyon, 2020. English. ⟨NNT : 2020LYSEI005⟩. ⟨tel-02882664v2⟩

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