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Fracture mechanics assessment of crack propagation in railway axle steels under fully reversed variable amplitude loading

 
: Luke, M.; Varfolomeyev, I.; Lütkepohl, K.; Esderts, A.

Sonsino, C.M. ; Deutscher Verband für Materialforschung und -prüfung e.V. -DVM-, Berlin:
Second International Conference on Material and Component Performance under Variable Amplitude Loading 2009. Proceedings. Vol.1 : March 23 - 26, 2009, Darmstadt, Germany
Berlin: DVM, 2009
ISBN: 978-3-00-027049-9
pp.259-268
International Conference on Material and Component Performance under Variable Amplitude Loading <2, 2009, Darmstadt>
English
Conference Paper
Fraunhofer IWM ()
fracture mechanic; fatigue crack growth; inspection interval; railway axles; variable amplitude loading

Abstract
Application of fracture mechanics methods for predicting inspection intervals for wheelset axles requires, among other things, an accurate assessment of the level and sequence of service loads in the cross section subjected to examination. In order to characterize the crack propagation behaviour of typical railway axle materials such as 25CrMo4 (A4T) and 34CrNiMo6, tests on M(T) specimens have been performed under constant and variable amplitude loading conditions. The considered load spectra are derived from in-service measurements of stress amplitude histories of two different types of wheelset axles. A particular emphasis of the work is on the examination of crack growth acceleration and retardation phenomena arising under fully reversed loading (R = -1).

: http://publica.fraunhofer.de/documents/N-103847.html