Modélisation numérique du contact roue-rail pour l’étude des paramètres influençant les coefficients de Kalker : Application à la dynamique ferroviaire

Abstract : The calculation of normal and tangential forces is important for the dynamic modeling of the railway vehicle-track interaction. To determine the tangential forces at the wheel-rail contact level, the Kalker’s coefficients of stiffness are used in most of computer codes for different contact models. These coefficients were measured on bench several times in the 80s. A survey of these works, conducted by Hobbs, shows a decrease of up to 50 % in value compared to Kalker’s theory. The aim of this thesis is first to identify the real causes of the dispersion observed between the various measurements, usually attributed to the surface contamination, then to develop a model taking into account some of them.The numerical modeling of the wheel-rail contact is presented in two parts. In the first part, a direct boundary element method based on Boussinesq-Cerruti solution is developed to study the normal and sliding contact between two elastic bodies, and then extended to the resolution of rolling contact problem. Successfully applied to the wheel-rail contact for non-Hertzian situation, this method is a promising tool for studying the parameters influencing Kalker’s coefficients which combines both precision and speed.In the second part, a finite element model for rolling contact between wheel and rail is developed to study the normal and the tangential contact problems using the explicit and the implicit integration schemes. The elastic solution is compared with the solution of the CONTACT software. The three-dimensional finite element model takes into account the elastoplastic behavior of the bodies in contact as well as the existence of a third body layer at the interface between the wheel and the rail. Finally, a correction of Kalker’s coefficients is estimated from the results of the numerical simulations.To study the impact of this correction on the critical speed of the vehicle, a stability analysis is performed using the multibody dynamics software VOCO in which the reduced factors of Kalker’s coefficients are considered
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Moncef Toumi. Modélisation numérique du contact roue-rail pour l’étude des paramètres influençant les coefficients de Kalker : Application à la dynamique ferroviaire. Matériaux. Université Paris-Est, 2016. Français. ⟨NNT : 2016PESC1158⟩. ⟨tel-01556205⟩

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