Corrugation, shelling and squats are some unexpected technical problems caused by increasing service tonnage, increasing load of the rails and increasing train speed at Deutsche Bahn AG lines since the last decades. As the complex phenomena of rolling contact fatigue in the rail / wheel system is difficult to understand extensive investigations have to be done to describe the multiaxial rolling contact fatigue processes and to develop and verify multiaxial fatigue criteria and lifetime predictions. To reach this aim a reliable fatigue data base of the utilised steels is required. To obtain such data, specimens were worked out of rails and wheels used in high speed traffic. With these specimens the lifetime behaviour and the endurance limit were estimated from push-puff tests. For the rail steel stress and total strain controlled fatigue tests were performed. The resulting lifetime behaviour is compared. In the wheel there are several regions with different microstructures due to the heat treatment at the end of the manufacturing process. Specimens were taken from the wheel rim representing these different microstructures. With these specimens stress controlled fatigue tests were performed. The influence of the different microstructures on the deformation and lifetime behaviour is showed.
Deformation and lifetime behaviour of cyclic loaded rail and wheel steels
Verformung und Lebensdauerverhalten von zyklisch belasteten Stahlschienen und -rädern
EUROMAT, EUROMAT, 1999 ; 305-311
2000
7 Seiten, 8 Bilder, 2 Tabellen, 5 Quellen
Conference paper
English
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