Frottement sec à grande vitesse du couple Ti6Al4V-Ti6Al4V : étude expérimentale et modélisation du comportement thermomécanique

Abstract : In case of exceptional events in aircraft engines (bird ingestion or blade disassembly), blade motions induce sliding at the interlock between the blade root and the slot of the fan rotor. The interface then undergoes quasi-instantaneous sliding under high normal pressure. This thesis work was initiated to investigate this phenomena and deals therefore with extreme sliding interactions for a Ti6Al4V tribopair (aircraft engine CFM56). Interface behavior and wear modes associated to these extreme thermomechanical loads remain poorly studied in literature. Links between velocity, pressure, temperature and friction force have been investigated by using a specific tribometer adapted on a ballistic bench, a foil-workpiece thermocouple and finite elements analysis. Induced damage were then analyzed by studying wear and microstructure evolutions (SEM, nanotomography and EBSD). A semi-analytical model, based on adiabatic shearing of asperities, has been proposed to evaluate the evolution of the real area of contact. By associated the latter with two experimental tests, upper and lower estimations of the mean friction force for a large velocity range can be calculated. This work is the result of collaboration between aircraft manufacturer Snecma, the LaBPS (Laboratory of Mechanics, Biomechanics, Polymers and Structures) and the LEM3 (Laboratory of Microstructure and Mechanics of Materials)
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Guillaume Chassaing. Frottement sec à grande vitesse du couple Ti6Al4V-Ti6Al4V : étude expérimentale et modélisation du comportement thermomécanique. Autre [cond-mat.other]. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0239⟩. ⟨tel-01754648⟩

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