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This paper examines several parameters that play significant roles in the adhesion coefficient of wheel/rail interface. Those parameters are running speed, water temperature, wheel load and surface roughness of the wheel and rail. Both theoretical and experimental approaches are used to describe the relation between the parameters and their influence on the adhesion coefficient. Numerical analysis was based on mix-lubrication theory. Laboratory experiments were conducted with a twin-disc rolling contact machine. The numerical and experimental results were similar. The results showed that adhesion coefficient increases with the increase of water temperature and surface roughness. Thus, the adhesion coefficient can be kept high under wet conditions by raising water temperature or increasing the surface roughness. However, the influence of wheel load may depend on surface roughness and running speed.

Influential Factors on Adhesion between Wheel and Rail under Wet Conditions