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Mesures de champs hétérogènes dans un alliage à mémoire de forme de Nickel-Titane sous sollicitations dynamiques

Abstract : The specific properties of the shape memory alloys are mainly due to the martensitic transformation occuring in the material turning the austenitic phase into a stress-induced martensitic phase when mechanical or thermal loadings are applied. This study focus on pseudoelasticity which allows SMAs to recover their initial state after undergoing large deformation. when a mechanical load is experienced.This study is focused on the behavior of SMAs under dynamic loading. Several experimental methods were developped : a Split Hopkinson Tensile Bar (SHTB) was set up and digital image correlation (DIC) was adapted to this case and allows us to measure heterogeneous strain fields on the surface specimen due to martensitic transformation.This work present a lot of experimental results and aim at helping researchers to develop behaviour models of SMAs for dynamic loading. The DIC was also adapted to fast imaging measure and Hopkinson bar tests, providing complementary results to the forces and velocities obtained with the bars.
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  • HAL Id : tel-00669701, version 1

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Dominique Saletti. Mesures de champs hétérogènes dans un alliage à mémoire de forme de Nickel-Titane sous sollicitations dynamiques. Autre. École normale supérieure de Cachan - ENS Cachan, 2011. Français. ⟨NNT : 2011DENS0051⟩. ⟨tel-00669701⟩

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