Wheel and rail surface modifications due to wear have a very important impact on some critical issues of railway engineering. This is probably due to the fact that a thorough comprehension of wear phenomena occuring at wheel/rail interface requires a multi-disciplinary approach where competencies ranging from contact mechanics to rail vehicle dynamics and train-track interaction are needed, together with a strong competency on material behaviour. Among the open questions in the field, there is a strong need for a deeper comprehension of the causes of some wear effects, typical of railroad systems, like rail corrugation or wheel poligonisation. The typical features of wear occuring on a railway wheel used for Intercity or high speed service is shown, where the original ORE S1002 profile is compared to a worn profile measured after approximately 300.000 km of service, a value which falls within the typical range of mileage after which the wheel is re-profiled. Both numerical and experimental results showing the influence of wear on vehicle dynamic behaviour were given. In particular, the main effects of regular and irregular wear were presented and discussed. A brief description of the different phenomena associated to wear and the state of the art of wear modelling has also been presented. Although the effects of both regular and irregular wear are well known and may be correctly reproduced by a simulation code, at present no fully satisfying explanation of the causes of irregular wear is available. Moreover, the importance of the different phenomena associated to wheel and rail wear, as well as the associated damage mechanisms, should be investigated in the different wear regimes in order to be able to separate abrasive wear from ratchetting effects. This will help to find countermeasures and improve planning strategies for maintenance activities and to develop wheels and rails with longer life.
Wheel-rail contact: wear effects on vehicle dynamic behaviour
Rad-Schiene-Kontakt: Verschleißeffekte am dynamischen Fahrzeugverhalten
2001
6 Seiten, 8 Bilder, 25 Quellen
Conference paper
English
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