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Mécanismes d'endommagement d'empilements de faible adhésion sous contact glissant

Abstract : In this PhD thesis, the scratch mechanisms during sliding contact on thin layers with low adhesion have been investigated with a ball on plane tribometer that allows in-situ microscopic observations. In this work, experiments were carried out on glass/ZnO/Ag/ZnO/Si3N4 model stacks and the impact of several parameters was studied: force, size of the ball, thickness of the overcoat, adhesion and friction coefficient.We have shown that the scratch process has three successive phases: initiation, development and steady state. Initiation begins with transverse cracks in the stack followed by delamination due to crack bifurcation at the interface above the silver layer. Only the characteristic size of these phenomena depends on parameters such as the thickness of the layer or its adhesion. After initiation, a phenomenon of pleating occurs even if confined under the contact and leads to the building of a pile of debris at the front of the contact zone by accumulation. Finally, in steady state, the scratch is only driven by the interaction between the pile of debris and the layers. It has been shown that the complexity of this interaction makes quasi-impossible any measure of adhesion based on the post mortem characteristics of the scratch.Finally, it has been shown that it is possible to improve the scratch resistance of a stack by patterning its silver layer at nanoscale. The origin of this improvement derives from an increase of adhesion due to pinning effect which has been demonstrated by using cleavage experiments.
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Submitted on : Wednesday, December 13, 2017 - 10:33:12 AM
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Aymar Quarré de Boiry. Mécanismes d'endommagement d'empilements de faible adhésion sous contact glissant. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066185⟩. ⟨tel-01662410⟩

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