Wheel rail contact thesis

difference between coefficient of friction and coefficient of adhesion

In this thesis different models are presented for the search of the contact location as well as for the normal and the tangential contact problem. For the experiments, two devices were developed to be mounted on a train and successfully used on the real track.

Combining these two assumptions, a mixed lubrication friction model is developed for the Hertzian elliptical contact situation in which the interfacial layer is acting as a lubricant governed by the Eyring model. In some cases, the wheel and rail wear is severe enough to spread to the adjacent rail profiles and damage the adjacent rail lines. In: The 3rd international conference on recent advances in railway engineering, Tehran Google Scholar Ahlstrom J, Karlsson B Microstructural evaluation and interpretation of the mechanically and thermally affected zone under railway wheel flats. The low friction situation is assumed to be caused by an interfacial layer, which is acting like a lubricant. Kalker JJ On the rolling contact of two elastic bodies in the presence of dry friction. Soleimani H A study and comparison of different methods for wheel—rail wear measurement and proposing an applicable local method. The coefficient of adhesion depends on several factors such as creep in the contact area of wheels and rails, the surface profile of wheels and rails, wheel and vehicle speed rail, rail vehicle dynamics and characteristics of the traction system. Wear 7 — CrossRef Google Scholar Kumar S The investigation of derailment. Archard JF Contact and rubbing of flat surfaces. Jin X, Zhang J A complementary principle of elastic bodies of arbitrary geometry in rolling contact. Mohammadzadeh S, Ghahremani S Estimation of train derailment probability using rail profile alterations.

Wear 1—3 — CrossRef Google Scholar In: Proceedings of the 1st international conference on mechanical and aerospace engineering, Iran Google Scholar 5.

Louis Google Scholar To this end, the research described in this thesis is twofold: theoretical; in which the wheel - rail contact is modelled in terms of contact and friction, and experimental; in which the friction between wheel and rail is measured to validate the developed model.

coefficient of adhesion in ac and dc traction

In: The 3rd international conference on recent advances in railway engineering, Tehran Google Scholar It is noteworthy that the most destructive factor causing wheel and rail wear, which can be significant and have negative consequences, is dynamic instability which is common to rail vehicles.

Hence, different types of wear mechanisms, causes and the importance of preventing the emergence of any of them are fully examined.

How to model the wheel rail contact? Wear —14 CrossRef Google Scholar In: 10th conference and 3rd exhibition of railway transportation achievements Google Scholar 9.

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Friction in wheel