Effect of elasto-plasticity on the creep force characteristics and the railway vehicle stability. In : The Dynamics of Vehicles on Roads and Tracks
TOUMI ; CHOLLET ; YIN
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
TOUMI ; CHOLLET ; YIN
Résumé / Abstract
To determine the tangential forces at the wheel-rail contact level, the ? linear coefficients of stiffness provided by Kalker's theory are used in ? many dynamic codes for the different contact models simulated. These ? creep coefficients are exposed in reality to many reducing parameters ? like roughness, surface contamination and third body layer. They also ? can't take into account the elasto-plastic behavior of the bodies in ? contact. In this paper, a three dimensional finite element model is ? developed to study the wheel-rail rolling contact. The elastic solution ? was compared to Kalker's theories and the effect of elasto-plasticity on ? the creep force characteristics was studied. It is found that the ? elasto-plastic behavior reduces the creep coefficients in the ? longitudinal and the lateral direction. The reduced coefficients of ? stiffness are assessed from this model and their influence on railway ? vehicle stability is checked. The stability analysis shows that the ? non-application of a reducing factor to Kalker's coefficients ? overestimates the critical speed.
Editeur
CRC Press
