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High-Speed Measurements of Steel–Ice Friction: Experiment vs. Calculation

1
Fraunhofer IWM MikroTribologie Centrum, Rintheimer Querallee 2a , 76131 Karlsruhe, Germany
2
CNR-Istituto Nanoscienze S3, Dipartimento di Scienze Fisiche, Università di Modena e Reggio Emilia, Informatiche e Matematiche Via Campi, 213/a, 41125 Modena, Italy
*
Author to whom correspondence should be addressed.
Lubricants 2018, 6(1), 26; https://doi.org/10.3390/lubricants6010026
Received: 6 February 2018 / Revised: 2 March 2018 / Accepted: 4 March 2018 / Published: 9 March 2018
An ultra-thin water film plays the decisive role in steel–ice friction in bobsleighing. The water film has a thickness on the order of nanometers and results from the superposition of an existing quasi-liquid layer and additional surface water generated by frictional heat. When friction is measured as function of sliding velocity, the coefficients decrease according to the typical Stribeck behavior. However, for highest sliding velocities, it is still unknown whether friction decreases further or shows an increase due to viscous drag. Both tendencies are essential for the construction of safe bobsleighs and bobsleigh tracks. This contribution presents results of high-speed experiments up to 240 km/h for a steel slider on a disk of ice at different ice temperatures. In addition, using the friction model of Makkonen, friction coefficients were calculated as function of sliding velocity and ice temperature. The significant correlation between experimental results and model calculation supports the model conception of frictional melting and viscous shearing. View Full-Text
Keywords: steel–ice contact; water lubricated sliding; ultra-low friction steel–ice contact; water lubricated sliding; ultra-low friction
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Scherge, M.; Böttcher, R.; Spagni, A.; Marchetto, D. High-Speed Measurements of Steel–Ice Friction: Experiment vs. Calculation. Lubricants 2018, 6, 26.

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