Improved Creep Force Model for Wheel/Rail Contact Considering Roughness and Temperature

SUMMARY Some characteristics of measured creep force curves cannot be explained with common theories of rolling contact. This work proposes extensions for creep force calculation in the case of dry friction. It is based on the creep force law of Shen, Hedrick and Elkins. The approximate consideration of the surface roughness yields a reduced initial slope whereas the introduction of a temperature dependent coefficient of friction can explain the decrease of creep forces at high creepages. The creep force curves calculated with the new model show the same characteristics as in measurements.

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