In the last decades a large number of researchers investigated the different failure mechanisms of railroad rails, including wear and surface or subsurface initiated RCF (rolling contact fatigue); due to the continuous increase of in service conditions severity, failure occurrence is increasing not only for rails but also for wheels. The behaviour of R7T wheel steel under rolling contact fatigue conditions has been investigated in the present paper, by means of a twin disc Amsler machine; tests were performed under dry or water lubrication conditions, different contact loads and slide/roll ratio gamma. Both cylindrical and convex rollers have been used to assess the influence of the stress distribution under the contact area. Test results made evident the negative effect of small slide/roll ratio values and the crucial role played by water lubrication in accelerating crack nucleation and propagation. Scanning electron microscope analysis of longitudinal cross sections of the rollers allowed to investigate the typical RCF failure mechanisms and the morphology of propagating cracks. (VDEh)


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Rolling contact fatigue in R7T rail wheel steel


    Additional title:

    Dauerwälzermüdung des Stahls R7T für Eisenbahnräder


    Contributors:
    Roberti, R. (author) / Faccoli, M. (author) / Gelfi, M. (author) / Ghidini, A. (author)


    Publication date :

    2001


    Size :

    8 Seiten, 7 Bilder, 2 Tabellen, 9 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




    Rolling contact fatigue of wheel and rail

    Dörner, Florian / Kleiner, Ott / Schindler, Christian et al. | Tema Archive | 2012


    Wheel/rail rolling contact fatigue – Probe, predict, prevent

    Ekberg, Anders / Akesson, Bengt / Kabo, Elena | Tema Archive | 2014


    Rolling contact fatigue of a rail steel

    Clayton, P. / Hill, D.N. | Tema Archive | 1987


    Wheel-rail rolling contact theory

    Kalker, J.J. | Tema Archive | 1991