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APPORT DE LA MICROCARACTERISATION ACOUSTIQUE A LA TRIBOLOGIE

Abstract : The tribological life of a "dry contact" takes place from the first relative movements of the first bodies. It concerns the phase of conception of the contact that determines locally, for an imposed normal force, the tangential force generated. These forces determine the stress field endured by the first bodies. This response or phase of birth is translated in the first bodies behaviour that goes from crack initiation to the brutal particle detachment that constitutes the third body. The study of this response implies the measurement of elastic characteristics of coatings and the skin of the first bodies, then the location and of the propagation of cracks, and the changes of structure that lead to the particles detachment. Up to-there, this study has been performed using destructive methods. The originality of the current work, has been to use the acoustic microcharacterization that allows to visualize local variations of elastic properties of the surface and the subsurface of the first bodies and to quantify these properties from the measurement of the acoustic signature. For this, a rubbing simulator has been adapted to the acoustic microcharacterization. In parallel, an external laboratory adapted an acoustic microscope to the tribological purposes. It concerns therefore a first study, that combines a tool of very recent characterization to an area of study all as new. Consequently, the work has demanded a very strong implication in acoustic microscopy and in tribology as well as a great persistence to solve many technical and scientific problems in order to evaluate performances of the acoustic microscope with regard of the first body responses. This work has transformed an idea into a reality.
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Contributor : Youcef Guetteche <>
Submitted on : Saturday, November 16, 2019 - 11:39:11 AM
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Youcef Guetteche. APPORT DE LA MICROCARACTERISATION ACOUSTIQUE A LA TRIBOLOGIE. Génie mécanique [physics.class-ph]. Insa Lyon; LaMCoS - Laboratoire de Mécanique des Contacts et des Structures, UMR 5259 (Lyon, INSA), 1996. Français. ⟨tel-02366653⟩

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