A comprehensive approach is developed for studying the fatigue phenomena (crack initiation and propagation) induced by repeated rolling or rolling-sliding contacts between wheel and rail. Cracks initiate and propagate in the rail head in a complex varying multiaxial stress regime due to Hertzian or non-Hertzian contacts generating 3D residual stress pattern. This paper presents the main steps of such an approach devoted to the modeling of defects induced in the rails by the traffic. Special attention is paid to some of the principal difficulties met as well as to the proposed solutions. Examples of applications for the prediction of initiation as well as propagation of some defects are presented. It is shown that numerical simulations predict very well the locus of crack initiation as well as its propagation in the rail. The authors' approach presents at least three main originalities: first, it is a global approach starting from the evaluation of the initial state of the rail to the simulation of the crack propagation under complex loading including multiaxial residual stresses. Second, special and original numerical methods for the evaluation of the initial states, the overloads and the elastoplastic state under service loading have been developed. Third, a new concept based on a 'structural Paris law' has been developed and used in the crack propagation simulations.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    A comprehensive approach for modeling fatigue and fracture of rails


    Weitere Titelangaben:

    Eine umfassende Näherung zur Modellbeschreibung der Ermüdung und des Bruches von Eisenbahnschienen


    Beteiligte:
    Dang Van, K. (Autor:in) / Maitournam, M.H. (Autor:in) / Moumni, Z. (Autor:in) / Roger, F. (Autor:in)

    Erschienen in:

    Engineering Fracture Mechanics ; 76 , 17 ; 2626-2636


    Erscheinungsdatum :

    2009


    Format / Umfang :

    11 Seiten, 17 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Fatigue of rails

    Kreuzpointner, Paul | Engineering Index Backfile | 1914



    Fatigue strength tests on rails

    Yamanaka, Y. | Engineering Index Backfile | 1964


    Wear and fatigue of rails

    Ros, M. | Engineering Index Backfile | 1953


    Fatigue crack growth of rails for railways

    Da Silva, L.F.M. | Online Contents | 2003