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Effect of humidity, temperature and railhead contamination on the performance of friction modifiers: Pin-on-disk study
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-2489-0688
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2013 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 227, no F2, 115-127 p.Article in journal (Refereed) Published
Abstract [en]

Commercially available friction modifiers are used in many different countries that have widely different atmospheric conditions. These variations in atmospheric conditions lead to varying levels of railhead oxidation and debris build-up. Friction modifiers can be applied to the rail without any prior cleaning of the rail and this can lead to varying friction modifier/iron oxide ratios potentially affecting the performance of the friction modifier. This paper reports the results of an investigation that was performed to determine the effects of varying atmospheric and oxide conditions on the performance of friction modifiers. A pin-on-disk test rig with an attached environmental chamber was used for the study. Results show that relative humidity has a pronounced effect on the way in which the friction modifier affects friction levels, and also the amount of time it remains on the disk. This also depends on the concentration of oxide in the friction modifier. Glow discharge optical emission spectroscopy analysis was also carried out to assess the effect of the friction modifier and atmospheric conditions on the chemical composition of the surface of the disk. Results show that the depth of surface modification is vastly different depending on the conditions and level of railhead debris.

Place, publisher, year, edition, pages
2013. Vol. 227, no F2, 115-127 p.
Keyword [en]
Friction modifier, coefficient of friction, relative humidity, temperature, iron oxide, pin-on-disc, wheel-rail contact, glow discharge optical emission spectroscopy analysis
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-122123DOI: 10.1177/0954409712452239ISI: 000317295700001Scopus ID: 2-s2.0-84883617354OAI: oai:DiVA.org:kth-122123DiVA: diva2:621191
Note

QC 20130514

Available from: 2013-05-14 Created: 2013-05-13 Last updated: 2017-12-06Bibliographically approved

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Olofsson, Ulf

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  • apa
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  • de-DE
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