The Influence of Lubricant Upon EHD Film Behavior During Sudden Halting of Motion

Although steady state elastohydrodynamic (EHD) lubrication is quite well understood both from the theoretical and from the experimental point of view, studies of transient effects in EHD are currently far less developed. This paper describes an experimental investigation into EHD film behavior durin...

Full description

Saved in:
Bibliographic Details
Published inTribology transactions Vol. 43; no. 4; pp. 731 - 739
Main Authors Glovnea, R. P., Spikes, H. A.
Format Journal Article
LanguageEnglish
Published Colchester Taylor & Francis Group 01.01.2000
Taylor & Francis
Subjects
Applied sciences
Deceleration
Elastohydrodynamic Lubrication
Exact sciences and technology
Friction, wear, lubrication
Machine components
Mechanical engineering. Machine design
Non-Steady
Squeeze
Transient
Ball
Transient response
Pressure distribution
Mechanical contact
Experimental study
Layer thickness
Steady state
Lubricant
Millisecond
Sliding contact
Flat contact
Elastohydrodynamic lubrication
Rheological properties
Online AccessGet full text

Cover

More Information
Summary:Although steady state elastohydrodynamic (EHD) lubrication is quite well understood both from the theoretical and from the experimental point of view, studies of transient effects in EHD are currently far less developed. This paper describes an experimental investigation into EHD film behavior during sudden halting of motion. A technique has been devised which enables both central lubricant film thickness and film thickness profiles to be measured every millisecond during halting of a ball on flat, sliding contact. This has enabled detailed information of influence of lubricant on film collapse during halting to be obtained. It is shown that film collapse occurs in two stages. The first is a very rapid reduction in film thickness with only very small changes in film geometry and thus pressure distribution. This is followed, as soon as entrainment ceases, by the formation of a lubricant entrapment, and subsequent slow leakage of fluid from the central film region. This paper focussed on the formation of this entrapment and the influence of the rheological properties of the lubricant, i.e. viscosity and pressure-viscosity coefficient, on its development and behavior. Presented at the 54th Annual Meeting Las Vegas, Nevada May 23-27, 1999
ISSN:1040-2004
1547-397X
DOI:10.1080/10402000008982402