Etude expérimentale du frottement sec à grande vitesses de glissement

Abstract : The understanding of friction laws is of major importance for modelling of metal forming processes and wear, among other applications. Few studies are concerned by friction at high sliding velocities. An original experimental device has been designed to study dry friction under static and dynamic conditions avoiding the constraints due to the wear. High sliding velocities (from 13 m/s to 60 m/s) and low sliding velocities (from 0 m/s to 3 m/s) are obtained respectively with an air gun set-up and a hydraulic machine using this same friction device. The interesting features of this dynamic friction set-up are related to the sliding speed is identical at any points of the contact zone and that a quasistationary friction process is obtained after a short transient. The effects on friction of the normal pressure p, and of the sliding velocity v are investigated. The results obtained for steel on steel friction coefficient are in agreement with those collected in the literature and allow to validate this experimental device. A second sliding pair of materials (steel on uncoated tungsten carbide) was tested to reproduce the tool-chip interaction during high speed machining. The usual decreasing friction coefficient with increasing sliding velocity v is confirmed. However, for higher velocities an opposite trend is observed. Finally, the results of dry friction coefficient calculated with the models proposed by ettles and by molinari et al. Were compared to the steel on steel data measured with the experimental device.
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Sylvain Philippon. Etude expérimentale du frottement sec à grande vitesses de glissement. Autre. Université Paul Verlaine - Metz, 2004. Français. ⟨NNT : 2004METZ016S⟩. ⟨tel-01750156⟩

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