The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper describes the influence of axle load (contact pressure) on the adhesion coefficient of wheel and rail in accordance with the running speed of a vehicle, the surface roughness of wheel/rail and wet conditions created by rain, snow, etc. The adhesion characteristics were investigated by theoretical analysis with a numerical model adopting the Elasto-Hydrodynamic Lubrication (EHL) theory and...
This paper describes an experimental investigation of in situ X-ray diffraction analysis of iron oxides on the railhead surface, which have an influence on various wheel/rail rolling contact phenomena, e.g. the adhesion between wheels and rails, which can cause rail corrugations. The X-ray analysis using portable X-ray diffractometer installing XRF called “XRDF” was carried out for the preliminary...
This paper describes how to improve the prediction method of the adhesion coefficient by means of the experimentally estimated boundary friction coefficient obtained by two kinds of twin-disc rolling contact machines and the ratio of real contact area to nominal contact area (RCA/NCA) obtained by ultrasonic measurement. The previous prediction method that the authors had already proposed in the last...
The experimental research on the wears of wheel and rail has been carried out using a large rolling-sliding contact test machine with the actual profiles of wheel and rail. Primarily, the effects of axle load, the angle of attack, rail hardness and lubrication on wear behaviors of wheel flange and rail gauge corner have been particularly focused in research. Based on those experimental results, the...
This paper describes the relationship between transient variation in the traction coefficient of a twin-disc of pearlitic carbon steel and variation in the surface oxide layer on a twin roller under unlubricated and water lubricated conditions, in order to investigate the cause of the transient variation of traction coefficient in rail/wheel contacts. This was measured by using auger Electron Spectroscopy...
Currently the surface characteristics of rail has been focused on to understand the coefficient of friction between wheel and rail because one of main causes of flange climb derailment and a kind of rail corrugations generated in a submarine tunnel can be considered to be the coefficient of friction. Then some of the influential factors of the coefficient of friction have been identified by findings...
Rolling contact fatigue damage is accumulated in rails during the repeated passage of trains over the rails, and an incipient crack may initiate due to the rolling contact fatigue. Rail failures can occur due to crack growth in the rails. In order to prevent such rail failures, the estimation of the behavior of internal rail cracks is required on the basis of an exact engineering analysis model as...
Lubrication in sharp curves has been commonly adopted so far to decrease the friction between wheel flange and rail gauge face following wear reduction and energy consumption. Also, lubrication is focused on its effect on decreasing the possibility of wheel flange climb derailment and squealing which is a kind of rolling noise. In addition, the lubrication between wheel tread and the top of low rail...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.