On high speed railways the knowledge of the state of rail treads is very important. Non-destructive testing methods have become widely used for these investigations because many parameters of the state of the rails can be measured precisely and rapidly by them. The magnetic Barkhausen-noise (MBN) measurement is one of the most popular methods, which is mainly applied for examining the stress state of rails. A very relevant problem of the high-speed tracks is corrugation: on the running surface of the rail (the contact surface between the rail and the wheel) a surface modulation of 5-10 cm wavelength and 0.1-1 mm am-plitude appears. The corrugation is undesirable because it increases the traction resistance, the noise emission and the vibration, which may damage the rail-wheel system. The magnetic Barkhausen-noise has been investigated on the running surface of a railway rail and a good correlation has been found between the noise and corrugation. The Barkhausen-noise showed minima and maxima at the hill and valley positions, respectively. This correlation can be used to observe or preindicate the corrugation process. Usually the structural change is not homogeneous along the rail axis and therefore different hardness and wear resistant parts appear during the load. The part of smaller hardness and wear resistance will wear stronger than the part of higher hardness. Thus valleys and hills will be formed. Therefore a definite correlation between the Barkhausen-noise and the corrugation profile-as it is observed-can be expected; the lower noise values at the hills indicate a more drastically changed microstructure (and a higher wear resistance).
Correlation between Barkhausen-noise and corrugation of railway rails
Korrelation zwischen dem Barkhausen-Rauschen und der Wellenbildung von Eisenbahnschienen
Journal of Materials Science ; 37 , 17 ; 3599-3601
2002
3 Seiten, 3 Bilder, 10 Quellen
Aufsatz (Zeitschrift)
Englisch
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