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Pin-on-disc study of the effects of railway friction modifiers on airborne wear particles from wheel-rail contact
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements. (KTH railway group)
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements. (KTH railway group)ORCID iD: 0000-0003-2489-0688
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
2013 (English)In: Tribology International, ISSN 0301-679X, Vol. 60, 136-139 p.Article in journal (Refereed) Published
Abstract [en]

Knowledge of wheel–rail interaction is crucial to wheel and rail maintenance. In this interaction, some of theworn-off material is transformed into airborne particles. Although such wear is well understood, few studiestreat the particles generated. We investigated friction modifiers' effects on airborne particles characteristicsgenerated in wheel-rail contacts in laboratory conditions. Pin-on-disc machine testing with a round-head pinloaded by a dead weight load 40 N simulated maximum contact pressure over 550 MPa. Airborne particlecharacteristics were investigated in dry contacts and in ones lubricated with biodegradable rail grease andwater- and oil-based friction modifiers. The number of particles declined with the grease; the number ofultrafine particles increased with the water-based friction modifier, mainly due to water vaporization.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 60, 136-139 p.
Keyword [en]
Airborne particles, Lubricant, Railway, Wear
National Category
Tribology Other Environmental Engineering Nano Technology
Research subject
Järnvägsgruppen - Effektiva tågsystem för godstrafik; The KTH Railway Group - Tribology
URN: urn:nbn:se:kth:diva-104664DOI: 10.1016/j.triboint.2012.11.013ISI: 000315550700019ScopusID: 2-s2.0-84870703141OAI: diva2:566215

QC 20121128

Available from: 2012-12-07 Created: 2012-11-08 Last updated: 2013-12-03Bibliographically approved
In thesis
1. Towards elimination of airborne particles from rail traffic
Open this publication in new window or tab >>Towards elimination of airborne particles from rail traffic
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Since the investigation of wear particles from rail transport started in the late 1910s, the high mass concentrations of these particles have prompted concern among researchers interested in air quality. However, effective action has yet to be taken because relevant knowledge is still missing. This thesis provides knowledge of airborne wear particles originating from rail transport. Some aspects of their characteristic parameters, such as size, mass concentration, number concentration, and morphology, were investigated in the field and in laboratory tests. We also discuss means to mitigate non-exhaust emissions, as well as the advantages and disadvantages of various test set-ups in the seven appended journal papers:Paper A reviews recent studies of exhaust and non-exhaust emissions from rail vehicles. The results, measurements, adverse health effects, and proposed or applied solutions presented in this literature are summarized in this paper.Paper B summarizes the results of field tests we conducted. The effects of curve negotiation and braking under different real conditions were investigated in a field test in which on-board measurements were made. The elemental composition and morphology of the particles emitted and their potential sources were also investigated.Paper C describes how a pin-on-disc machine can be used to reproduce real operating conditions during mechanical train braking in a controlled laboratory setting. The results were validated by comparing the field test results with the results of laboratory studies.Paper D presents comprehensive results of laboratory studies of airborne particles from different braking materials. A new index is introduced in this paper, which can be used as a quantitative metric for assessing airborne wear particle emission rates.Paper E describes the effects of using various friction modifiers and lubricants on the characteristics of airborne particles from wheel–rail contact under lubricated and unlubricated conditions.Paper F reports work to simulate thermoelastic instability in the cast-iron braking material. We simulated the fluctuation of the flash temperature by considering the temperature dependency of the material properties and the transformation of the contact state due to thermomechanical phenomena and wear.Paper G reviews new full- and sub-scale measurements of non-exhaust emissions from ground transport. The advantages and disadvantages of on-board measurements, pin-on-disc tests, dynamometer tests, and test rig studies are discussed in this paper.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. 37 p.
Trita-MMK, ISSN 1400-1179 ; 2013:11
Airborne, brake block, brake pad, railway, subway, TEI, wheel–rail, wear
National Category
Research subject
The KTH Railway Group - Tribology
urn:nbn:se:kth:diva-131372 (URN)978-91-7501-881-2 (ISBN)
Public defence
2013-11-22, F3, Lindstedtsvägen 26, KTH Royal Institute of Technology, Stockholm, 14:00 (English)

QC 20131025

Available from: 2013-10-25 Created: 2013-10-14 Last updated: 2013-10-25Bibliographically approved

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