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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...
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...
This paper describes an experimental investigation of the transient traction coefficient at the wheel/rail interface under dry or unlubricated conditions with varying humidity and temperature. A twin-disc type of rolling–sliding frictional machine is used to simulate the actual contact conditions of a wheel and a rail, at low slip ratios and rolling speeds. The results report the influence of rolling...
This paper focuses on the effect of the boundary lubrication of water on the transient traction characteristics of two rollers contact. The traction coefficient was measured under wet condition using a twin-disc-type of rolling–sliding frictional machine, which can simulate the actual wheel/rail contact condition under a low slip ratio and low rolling speed. The experimental results of the transient...
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