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An adhesion model for wheel-rail contact at the micro level using measured 3d surfaces
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.ORCID iD: 0000-0003-2489-0688
2012 (English)In: 9th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, CM 2012, Southwest Jiaotong University , 2012, 550-562 p.Conference paper, Published paper (Refereed)
Abstract [en]

Railway vehicles require a certain level of wheel-rail adhesion for efficient, reliable, and economical operation. A comprehensive wheel-rail contact model is useful for optimizing the adhesion, to simulatevehicle running conditions and to predict wear and rolling contact fatigue. A new contact model using measured 3D surfaces has been developed, comprising normal contact, rolling-sliding contact, flash temperature, and local friction coefficient models. This model can predict the local contact pressure, including the plasticity, local flash temperature, local tangential stress, local friction coefficient, and global adhesion coefficient. The influence of surface topography, creep, and speed on the adhesion coefficient, real contact area, and contact temperature is discussed. Results indicate that, due to increased contact area, the adhesion coefficient decreases with increased surface roughness, although the change is small. Furthermore, increasing speed reduces the adhesion coefficient due to the increasing contact temperature.

Place, publisher, year, edition, pages
Southwest Jiaotong University , 2012. 550-562 p.
Keyword [en]
Adhesion, Contact temperature, Local friction coefficient, Measured 3D surfaces, Rolling-sliding contact, Wheel-rail
National Category
Tribology
Identifiers
URN: urn:nbn:se:kth:diva-165125Scopus ID: 2-s2.0-84907003921OAI: oai:DiVA.org:kth-165125DiVA: diva2:807651
Conference
9th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, CM 2012, 27 August 2012 through 30 August 2012, Chengdu, China
Note

QC 20150424

Available from: 2015-04-24 Created: 2015-04-23 Last updated: 2015-04-24Bibliographically approved

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Olofsson, Ulf

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