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Effect of elasto-plasticity on the creep force characteristics and the ă railway vehicle stability

Author

Listed:
  • M. Toumi
  • H. Chollet

    (IFSTTAR/GRETTIA - Génie des Réseaux de Transport Terrestres et Informatique Avancée - IFSTTAR - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux)

  • H. Yin

    (TU Wien - Vienna University of Technology = Technische Universität Wien)

Abstract

To determine the tangential forces at the wheel-rail contact level, the ă linear coefficients of stiffness provided by Kalker's theory are used in ă many dynamic codes for the different contact models simulated. These ă creep coefficients are exposed in reality to many reducing parameters ă like roughness, surface contamination and third body layer. They also ă can't take into account the elasto-plastic behavior of the bodies in ă contact. In this paper, a three dimensional finite element model is ă developed to study the wheel-rail rolling contact. The elastic solution ă was compared to Kalker's theories and the effect of elasto-plasticity on ă the creep force characteristics was studied. It is found that the ă elasto-plastic behavior reduces the creep coefficients in the ă longitudinal and the lateral direction. The reduced coefficients of ă stiffness are assessed from this model and their influence on railway ă vehicle stability is checked. The stability analysis shows that the ă non-application of a reducing factor to Kalker's coefficients ă overestimates the critical speed.

Suggested Citation

  • M. Toumi & H. Chollet & H. Yin, 2016. "Effect of elasto-plasticity on the creep force characteristics and the ă railway vehicle stability," Post-Print hal-01482650, HAL.
    • Handle: RePEc:hal:journl:hal-01482650
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