The primary mechanisms playing a role in the dynamic wheel-rail response to rail weld irregularities in a ballasted track are pointed out. The concept of P1 and P2 forces for metallurgical rail welds, introduced in a first paper (1) concerning the present research, is further elaborated. The dynamic wheel-rail response is simulated for a number of geometrical rail weld measurements. Results show a good correlation between the gradient of the rail weld geometry and the maximum dynamic wheel-rail contact forces, whereas the correlation with vertical peak deviations is shown to be very poor. Therefore, an assessment method based on the gradient (introducing a speed-dependent quality index (1)) is more consistent than a method based on vertical tolerances. An approximate formula is presented to calculate the maximum dynamic wheel-rail contact force as a function of the train velocity and the maximum gradient of the weld geometry, in analogy to Jenkins' formulae for calculating P1 and P2 forces at dipped rail joints.


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    Title :

    Relation between the geometry of rail welds and the dynamic wheel-rail response: Numerical simulations for measured welds


    Additional title:

    Beziehung zwischen der Schienen-Schweißnahtgeometrie und dem dynamischen Rad-Schiene-Verhalten: Numerische Simulation für gemessene Schweißnähte


    Contributors:


    Publication date :

    2006


    Size :

    15 Seiten, 10 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English