Comportement du Zircaloy-4 recristallisé : identification du comportement anisotrope pour application à la situation d’accident de réactivité

Abstract : Zirconium alloy sheet and clad are strongly textured materials, resulting in sharp anisotropic mecanical behavior. The purpose of this work is to characterize and model the anisotropic behavior of recrystallized Zircaloy-alloy sheets. Anisotropy is investigated by usual mechanical tests (tensile and shear loadings) performed on sheet material using digital image correlation measurments. A model is identified from this experimental database obtained on sheet material. Finite element simulations of tensile notched tests are used to validate the law. Then, the model transferability from the sheet to the rod is studied. The transferability is suitable for uniaxial loading. On the contrary, the transferability is not fully adequate for biaxial loadings. Therefore, a new identification of parameters dealing with anisotropy from enriched database with an equibiaxial rod test is necessary.
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Elodie Bosso. Comportement du Zircaloy-4 recristallisé : identification du comportement anisotrope pour application à la situation d’accident de réactivité. Matériaux. Ecole Nationale Supérieure des Mines de Paris, 2015. Français. ⟨NNT : 2015ENMP0020⟩. ⟨tel-01251565⟩

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