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Rôle de l’intégrité de surface dans la tenue en fatigue d’un acier bainitique après fraisage de finition

Abstract : This thesis focuses on the effects of finishing milling on fatigue damage. Machining processes such as milling are known to incur high thermomechanical loadings, which alter the geometrical (roughness) and mechanical (residual stresses, strain hardening) properties of the surface and sub-surface of produced parts. These properties, designated as surface integrity, are likely to affect significantly the fatigue strength of machined parts. The problem has been studied here in the case of the ball-end tool finishing milling of bainitic steels. Several approaches were followed, starting with the measurement and characterization of surface integrity, and especially of its anisotropic nature. Secondly, the role played by surface integrity during fatigue behaviour was highlighted through a bending test campaign including different surface types. These mainly empirical works were completed with the study and improvement of a hybrid approach aiming at combining experimental data and modelling in order to predict quickly and efficiently the residual stress profiles induced by the process. Finally, the last part of the study has dealt with taking account of the results thus obtained in a so-called two-scale damage model, in order to describe, and insofar as possible, to predict the fatigue behaviour of the machined material.
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Aurélien Souto-Lebel. Rôle de l’intégrité de surface dans la tenue en fatigue d’un acier bainitique après fraisage de finition. Mécanique des matériaux [physics.class-ph]. École normale supérieure de Cachan - ENS Cachan, 2014. Français. ⟨NNT : 2014DENS0028⟩. ⟨tel-01127151⟩

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