Caractérisation et modélisation de l'état mécanique et microstructural des sous-couches affectées par l'usinage de finition du cuivre Cu-c2 et impact sur la résistance à la corrosion.

Abstract : The functional performance and life of mechanical components in general and their corrosion resistance in particular are of prime importance in the modern industry, as far as energy production, transportation, machines, medical and even electronic components are concerned. In the case of machined components, it is essential to improve their life and to reduce the premature failure by improving their surface integrity. So, a comprehension of the effect of the machining process mechanics on surface integrity and its consequences on corrosion resistance are essential.This thesis deals with the particular case of finishing machining of oxygen free high conductivity copper (OFHC) and its impact on the surface integrity and corrosion resistance. Firstly, a comparative experimental study between turning and orthogonal cutting is performed. Then, due to its simplicity, orthogonal cutting makes the object of the pursuit of the study. A numerical model is developed to predict the surface integrity induced by the cutting process. It uses a new constitutive model for OFHC copper taking into account microstructural transformations and the state of stress in the work material. Finally, the results issued from experimental studies and the numerical simulations are statistically treated in a multi-physical analysis with the objective of establishing the relationship between corrosion resistance, surface integrity and cutting physics.
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Lamice Denguir. Caractérisation et modélisation de l'état mécanique et microstructural des sous-couches affectées par l'usinage de finition du cuivre Cu-c2 et impact sur la résistance à la corrosion.. Génie mécanique [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2016. Français. ⟨NNT : 2016ENAM0029⟩. ⟨tel-01570865⟩

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