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Effect of shaft roughness and pressure on friction of polymer bearings in water
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-8285-9841
Department of Mechanical Construction and Production, Ghent University.
Department of Mechanical Construction and Production, Ghent University.
Division of Machine Design, School of Industrial Engineering and Management, Royal Institute of Technology.
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2014 (English)In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 228, no 4, p. 371-381Article in journal (Refereed) Published
Abstract [en]

In this study, the frictional behavior of selected commercially available unfilled polymers, namely, polyether ether ketone, polytetrafluoroethylene, polyethylene terephthalate, and ultra-high molecular weight polyethylene against an Inconel shaft was investigated using a journal bearing test configuration in water-lubricated sliding contact. Dynamic friction curves were obtained for various shaft roughness values and polymer combinations. The results showed a significant influence of shaft surface roughness on running-in and steady state friction in water-lubricated conditions. Contact angle measurements revealed a significant increase in wettability of Inconel counterfaces. The X-ray photoelectron spectroscopy (XPS) analysis of the surfaces suggests formation of a reaction layer on worn Inconel surfaces when sliding against the polymers. The influences of counter surface roughness and load on frictional response of polymers were studied through intermittent tests by obtaining dynamic and breakaway friction maps for different polymer materials, shaft roughness values, and pressure combinations. In general, a trend of decreasing friction was obtained with increasing contact pressure; however, the materials’ frictional responses to variations in counter surface roughness were different. These results indicate that although a reduced counter surface roughness may be beneficial for dynamic friction of polymers in all lubrication regimes, it can adversely affect the materials’ breakaway friction response.

Place, publisher, year, edition, pages
2014. Vol. 228, no 4, p. 371-381
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-10861DOI: 10.1177/1350650113506700ISI: 000332823500001Scopus ID: 2-s2.0-84899449518Local ID: 9bc37652-5d00-462d-9610-04d24b7add50OAI: oai:DiVA.org:ltu-10861DiVA, id: diva2:983809
Note
Validerad; 2014; 20131014 (aragol)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Golchin, ArashPrakash, Braham

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Tribology (Interacting Surfaces including Friction, Lubrication and Wear)

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