Endommagement en fatigue multiaxiale avec effet d’environnement REP

Abstract : The lifetime extension of the nuclear power plants is considered as a major energy challenge. For this reason, the risk analysis and the study of various effects of different factors that could potentially represent a hazard to a safe long term operation are necessary. These structures, often of large dimensions, are subjected during their life to complex loading combining varying mechanical and multiaxial loads, with non-zero mean values associated with temperature fluctuations and Pressurized Water Reactor (PWR) environment.In this context, the present study is part of the identification of the PWR environment effect and the equibiaxiality of the loading on the fatigue life of the austenitic stainless steels present in the primary pipes of a Pressure Water Reactor.For this purpose, the CEA has developed, in partnership with EDF and FRAMATOME, the experimental device «FABIME2e» for studying the equibiaxial fatigue in the PWR environment.First, a presentation of the experimental and numerical results obtained with the FABIME2e device is realized. These results show the aggravating effect of equibiaxial loading and environmental PWR conditions on the fatigue life of austenitic stainless steel. This effect remains covered by the Design curve defined by the design codes of the nuclear industry. Second, a new fatigue criterion is proposed to predict the lifetime in equibiaxial fatigue. This criterion takes into account the effect of the PWR environment.This work opens up several industrial and scientific prospects on the mechanical inter-pretation of equibiaxial fatigue tests in PWR environment and on the proposed fatigue criterion.
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Hager Dhahri. Endommagement en fatigue multiaxiale avec effet d’environnement REP. Matériaux et structures en mécanique [physics.class-ph]. Université Paris-Saclay, 2019. Français. ⟨NNT : 2019SACLY002⟩. ⟨tel-02308221⟩

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