Some important published papers on wheel-rail wear are reviewed. Their studies are mainly based on laboratory experiments and numerical procedures. Wheel-rail wear study is a very complicated project involving many subjects and many factors some of which are stochastic. Only by test, it is very difficult to identify various factors affecting the wear, and determine how much each contributes to the overall wear and the contact stress level. So far any advanced test facility can't represent track dynamic characters completely, such as nonlinear damping and non-linear stiffness. Therefore, the comprehensive theoretical model is essential to clarifying the many factors affecting the curved rail wear and the contact stresses. The present paper investigates the effect of the curving speed, the track super-elevation and the rail cant on the rail wear at the curved track using a numerical method. The numerical results are concluded as follows: (1) The contact stresses between wheel and rail depend on not only the curving speed but also the profiles of the wheel/rail. The curving speed variation leads to the change of wheel/rail normal load and the contact point position. Increasing the curving speed increases the normal loads on the wheels on the high curved rail. But the optimum match of the wheel/rail profiles can form the very small normal gap between the wheel and rail, and efficiently reduces the normal contact stress level increasing due to curving speed increasing. Therefore, the profiles of the wheel and rail dominate the maximum normal contact stress. Therefore the improvement of the profiles is a key technique in reducing the contact stress. (2) To increase the super-elevation of the curved track properly leads to the improvement of the curving behavior, and the reduction in the contact stresses and the wear. (3) The rail cant has a great influence on the rail wear and the contact stresses. Changing the rail cant means turning the rail. The contact points on the wheel tread or the rail top shift sharply in the rail turning. In such a situation, the match of the wheel/rail profiles probably becomes more inferior or finer, which depends on the prescribed profiles. Hence, both the selection of the rail cant and the improvement of the wheel/rail profiles should be simultaneously considered in the maintenance of the curved track. (4) The present paper just investigates the effect of three factors on the curved rail wear and the contact stresses. More factors, such as track gauge, wheel/rail profiles, wheelse.
An investigation into effect of train curving on wear and contact stresses of wheel and rail
Untersuchung des Einflusses des Kurvenfahrens eines Zugs auf den Verschleiß und die Kontaktspannung von Rad und Schiene
2009
10 Seiten, 14 Bilder, 40 Quellen
Conference paper
English
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