Title: Thermal and tribological study of a periodic contact under braking conditions

Authors: Monica Siroux, Anne-Lise Cristol-Bulthe, Yannick Desplanques, Bernard Desmet, Gerard Degallaix

Addresses: Laboratoire de Mecanique et Energetique, Universite de Valenciennes et du Hainaut Cambresis UVHC, Le Mont Houy, 59313 Valenciennes, Cedex 9, France. ' Laboratoire de Mecanique de Lille, UMR CNRS 8107 Ecole Centrale Lille, Cite scientifique, BP 48, 59651 Villeneuve d'Ascq, France. ' Laboratoire de Mecanique de Lille, UMR CNRS 8107 Ecole Centrale Lille, Cite scientifique, BP 48, 59651 Villeneuve d'Ascq, France. ' Laboratoire de Mecanique et Energetique, Universite de Valenciennes et du Hainaut Cambresis UVHC, Le Mont Houy, 59313 Valenciennes, Cedex 9, France. ' Laboratoire de Mecanique de Lille, UMR CNRS 8107 Ecole Centrale Lille, Cite scientifique, BP 48, 59651, Villeneuve d'Ascq, France

Abstract: The present work concerns the tribological and thermal studies of periodic contact obtained during successions of railway stop-brakings. Tests with heat accumulation, performed on a braking tribometer, permit the observation of a modification of the friction coefficient, a wear increase and the presence of a large compacted third body layer on the pad surface. An analytic model of thermal conduction is developed for the determination of the disc surface temperature evolution during the succession of stop-brakings. The results obtained using mass temperature measurements during the succession are compared with those estimated by pyrometry; a good agreement is found.

Keywords: railway braking; braking tribometer; periodic contact; friction coefficient; wear; disc surface temperature; tribology; thermal modelling; heat accumulation.

DOI: 10.1504/IJSURFSE.2010.030482

International Journal of Surface Science and Engineering, 2010 Vol.4 No.2, pp.93 - 110

Published online: 18 Dec 2009 *

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