Surface damage of wheel and rail profiles has been studied by the Swedish transport programme, using the Stockholm local traffic network as test subject. Olofsson and Telliskivi observed a transition from a mild wear condition at the wheel treadrail head contact to a severe wear condition at the wheel flange-rail gauge contact. This study focuses on the relation between generated airborne particles and the wear rate for a wheel and rail contact. The wheel and rail contact is experimentally simulated using pin-on-disc testing, to determine the difference in wear rate for a selection different contact conditions. Wear is discussed both in tribological terms as well as the categories widely used in the railway industry namely, mild, severe and catastrophic wear. The discussion is based on data for wear depth, coefficient of friction, topographical measurements, and measurements of airborne particles generated in the contact. The tests have been performed at one sliding velocity, and for a selection of loading conditions representative for different contact conditions in a real wheel and rail contact. It can be seen in the results that the wear rates vary with the contact conditions due to different types of triggered wear transitions. This is emphasized by the number and size of the airborne particles generated. The wear rate can be related to the number of airborne particles generated which are shown by the results. It is possible to relate the number of generated airborne particles in the size interval 0.25 to 1 mikrometer to the wear rate for the chosen contact conditions. A change in wear mechanism and wear rate is possible to detect by measuring the number of airborne particles. With lubrication the number of airborne particles possibly can be decreased by several orders of magnitude.
Wear rate testing in relation with airborne particles generated in a wheel-rail contact
2008
14 Seiten, 12 Bilder, 1 Tabelle, 10 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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