Etude de l'effet de l'équiaxiabilité sur la durée de vie en fatigue de l'acier noxydable austénitique

Abstract : Fatigue lifetime assessment is essential in the design of structures. Under-estimated predictions mayresult in unnecessary in service inspections. Conversely, over-estimated predictions may have seriousconsequences on the integrity of structures.In some nuclear power plant components, the fatigue loading may be equi-biaxial because of thermalfatigue. So the potential impact of multiaxial loading on the fatigue life of components is a majorconcern. Meanwhile, few experimental data are available on austenitic stainless steels. It is essentialto improve the fatigue assessment methodologies to take into account the potential equi-biaxialfatigue damage. Hence this requires obtaining experimental data on the considered material with astrain tensor in equi-biaxial tension.The aim of this study is to present the experimental and numerical results obtained with a device"FABIME2" developed in the LISN in collaboration with EDF and AREVA. The association of theexperimental results, obtained on the new experimental fatigue device FABIME2, with the numericalanalyses obtained by FEM simulation with Cast3M code, has enabled to define the aggravating effectof the equibiaxial fatigue loading. However, this effect is covered by the Design fatigue curve definedfrom the nuclear industry. For the crack propagation, a first simplified approach enables to study thekinetic behavior of crack propagation in equibiaxial fatigue.
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Soumaya Bradai. Etude de l'effet de l'équiaxiabilité sur la durée de vie en fatigue de l'acier noxydable austénitique. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2014. Français. ⟨NNT : 2014ESMA0023⟩. ⟨tel-01127549⟩

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