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Wear effects and mechanisms of soot-contaminated automotive lubricants

Green, D.A., Lewis, R. and Dwyer-Joyce, R.S. (2006) Wear effects and mechanisms of soot-contaminated automotive lubricants. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 220 (3). pp. 159-169. ISSN 1350-6501

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A study has been carried out to investigate the influence of soot-contaminated automotive lubricants in the wear process of a simulated engine valve train contact. Previous research on this topic has been mainly performed from a chemical point of view in fundamental studies, with insufficient relevance to real engine conditions, i.e. load and geometry. This study investigates the conditions under which wear occurs through specimen testing. The objective of the work was to understand the wear mechanisms that occur within the contaminated contact zone, to help in future development of a predictive wear model to assist in the valve-train design process. The effects of soot in lubricants have been tested using a reciprocating test-rig specifically designed for this application, where a steel disc is held in a bath of oil and a steel ball (replicating a valve train contact) is attached to a reciprocating arm. The materials, contact geometry and loading conditions are all related to specific conditions experienced within an engine's valve train. The testing was carried out under various contact conditions, using carbon black as a soot simulant. Wear measurements were taken during the tests and wear scar morphology was studied. The results have revealed how varying lubrication conditions changes the wear rate of engine components and determines the wear mechanism that dominates for specific situations.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright (c) 2006 Professional Engineering Publishing. This is an author produced version of a paper published in ' Proceedings- Institution of Mechanical Engineers Part J Journal of Engineering Tribology '. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Carbon black Contaminated lubricant Engine wear Soot Valve train Wear map Wear modelling Contamination Lubrication Valves (mechanical) Wear of materials Contaminated lubricants Valve trains Wear modeling Lubricants
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
Depositing User: Mr Christopher Hardwick
Date Deposited: 18 Aug 2009 17:32
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1243/13506501jet140
Status: Published
Publisher: Professional Engineering Publishing
Refereed: Yes
Identification Number: 10.1243/13506501jet140
URI: http://eprints.whiterose.ac.uk/id/eprint/9175

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