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Modélisation du grenaillage d’un alliage de nickel avec prise en compte de l’écrouissage et de la microstructure

Abstract : Shot-peening in a surface treatment used in the industry to enhance fatigue life of a mechanical part. Nonetheless, this process remains empirical as complex phenomena linked with residual stress relaxation are not well understood yet. For these reasons, peening step of turbine disks produced by Safran Aircraft Engines, made in Inconel 718, is not considered in the dimensioning phase of the part. Today there is a need for a precise prediction of the process and the life enhancement of peened parts. This thesis is part of the CONDOR project, the objective of which is to answer this need. This work is the first step, and its goal is to build a numerical model of shot-peening able to predict the work-hardening state after the process. In fact this parameter is known to have an important role in the relaxation of residual stress.Complete assessment of the mechanical behavior of Inconel 718 is first proposed. Then the numerical model is built, able to adress the stress and work-hardening state of the peened part. A statistical approach is also proposed. An important XRD experimental campaign on peened sampled was led to correlate the model. Finally, the simulation is used to predict the mechanical state after shot-peening
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Submitted on : Monday, October 12, 2020 - 4:48:08 PM
Last modification on : Tuesday, October 13, 2020 - 3:29:33 AM


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  • HAL Id : tel-02964789, version 1




Vincent Boyer. Modélisation du grenaillage d’un alliage de nickel avec prise en compte de l’écrouissage et de la microstructure. Matériaux et structures en mécanique [physics.class-ph]. Université de Technologie de Troyes, 2017. Français. ⟨NNT : 2017TROY0030⟩. ⟨tel-02964789⟩



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