Experimental Study on the Influence of the Third Medium on the Wheel/rail Maximum Static Friction Coefficient

doi:10.3901/JME.2018.18.123

Abstract

Abstract: The wheel/rail adhesion has great significance for the locomotive to achieve traction and braking, while the Wheel/rail friction coefficient would affect the wheel/rail adhesion characteristics and the wheel/rail maximum static friction coefficient could be used to define adhesion state of the wheel/rail contact area. In order to study the influence of "third medium" on the wheel/rail maximum static friction coefficient, a wheel/rail contact test-rig is set up to carry out the experimental study, such as wheel/rail contact test and wheel/rail maximum static friction coefficient test. Though the comparative analysis of the test results, the conclusions are drawn. The shape and area of wheel/rail contact spot obtained by the wheel/rail contact test is consistent with that by the finite element simulation. Compared with the wheel-rail friction coefficient in dry and clean condition, the wheel/rail maximum static friction coefficient reduces when water or oil medium exists between the wheel and rail alone. And the value of the coefficient under oil condition is the smallest. Besides, it increases when there is water and sand between wheel and rail. The coefficient under the condition of oil and sand between wheel and rail is larger than that under the condition of oil alone, but it still less than that under the drying conditions. Sanding could increase the wheel/rail maximum static friction coefficient, and river sand has better adhesive effect than the quartz sand, while resulting in more serious scratch on the wheel/rail surface. Therefore it is recommended to use quartz sand as wheel/rail increasing-viscosity medium.

Key words: static friction coefficient, third medium, wheel/rail adhesion, wheel/rail contact test-rig

CLC Number:

U211

ZHANG Jun, WANG Xueping, MA He. Experimental Study on the Influence of the Third Medium on the Wheel/rail Maximum Static Friction Coefficient[J]. Journal of Mechanical Engineering, 2018, 54(18): 123-128.

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