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Analysis of tribological behaviour of pad–disc contact in railway braking - Part 1. Laboratory test development, compromises between actual and simulated tribological triplets

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2007
auteur(s) Desplanques Yannick; Roussette Olivier; Degallaix Gérard; Copin Reynald; Berthier Yves
journal (abréviation) Wear (Wear)
volume (numéro) 262 (5-6)
pages 582 – 591
résumé In the field of railway braking, improving the performances of friction brake systems requires better knowledge of the local tribological behaviour of pad–disc contact under braking conditions. After analysing the tribological triplet involved in railway braking, this paper focuses on the development of laboratory tests for studying local physical phenomena caused by friction in braking. The aim is to generate at reduced scale similar contact conditions to those at full-scale. An original braking tribometer is presented whose design is based on similitude rules between reduced-scale and full-scale. As it is difficult to reproduce representative full-scale thermal loading generated by friction at reduced-scale, compromises are needed and the choice of experimental parameters, based on a non-dimensional conversion rule, is discussed. The results obtained at reduced-scale are presented and comparison with results available at full-scale shows that the reduced-scale tests are very representative.
mots clés Railway disc brake; Braking tribometer; Reduced-scale tests; Tribological triplet; Friction heat generation; Thermal representativeness
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