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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/35909

Title: Boundary friction characterisation of a used cylinder liner subject to fired engine conditions and surface deposition
Authors: Bewsher, Stephen R. (Rickie)
Leighton, Michael
Mohammadpour, Mahdi
Rahnejat, Homer
Offner, Gunter
Knaus, O.
Keywords: Boundary friction
Atomic force microscope (AFM)
X-Ray photoelectron spectroscopy (XPS)
Lubricant-surface combination
Issue Date: 2019
Publisher: © The Author(s). Published by Elsevier Ltd.
Citation: BEWSHER, S.R. ... et al., 2019. Boundary friction characterisation of a used cylinder liner subject to fired engine conditions and surface deposition. Tribology International, 131, pp. 424-437.
Abstract: In cylinder friction contributes as a primary source of parasitic dissipations in IC engines. For future engines to become more efficient, with enhanced fuel economy and increased power output, accurate prediction of new designs is required over the full lifetime of an engine. The work carried out presents use of a local pressure coefficient of boundary shear strength of asperities value, taking into account the localised effects of surface texture, coating and surface deposition. XPS spectra analysis was also carried out to identify the surface depositions as a result of combustion, not previously taken into account during piston ring pack simulation. Friction was shown by simulation to drop by up to 30% between the compression and combustion stroke as a result of using a carriable coefficient of boundary shear strength of asperities. It was found that piston varnish on the liner corresponded to higher values of the pressure coefficient of boundary shear strength of asperities, therefore showing the importance of using real system components run under representative operating conditions or numerical analyses.
Description: This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Sponsor: The authors of this work wish to show their thanks to the Engineering and Physical Sciences Research Council (EPSRC) and to our industrial collaborators AVL List GmbH for the financial and technical contributions they have made to this research.
Version: Published
DOI: 10.1016/j.triboint.2018.11.005
URI: https://dspace.lboro.ac.uk/2134/35909
Publisher Link: https://doi.org/10.1016/j.triboint.2018.11.005
ISSN: 1879-2464
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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