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Approche couplée de diffraction à haute énergie et de modélisation numérique pour l’étude multi-échelles du comportement superélastique d’un alliage à mémoire de forme Cu-Al-Be

Abstract : This work aims to study the multi-scale behaviour of an austenitic Cu-Al-Be shape memory alloy (SMA) upona stress-induced martensitic transformation (MT). Because of its strong anisotropy, this alloy is an ideal candidateto explore the inhomogeneities that develop at the inter and intragranular scales.This study has been carried out using a coupled approach between high-energy diffraction methods andnumerical simulation. The initial microstructure was imaged by TCD then the elastic deformation and rotationaveraged over 187 grains were measured by 3DXRD at each mechanical loading. The actual microstructure ofthe specimen was finely meshed to reproduce the full field tensile test by finite element calculation. For thispurpose, a micromechanical behaviour model simulating the behaviour of Cu-Al-Be was used.The methodologies developed, from both experimental and numerical point of view, revealed the influence ofcrystallographic orientation, grain size, neighbourhood, rotational field and local stresses on the MT.
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https://pastel.archives-ouvertes.fr/tel-03130513
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Submitted on : Wednesday, February 3, 2021 - 4:12:20 PM
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  • HAL Id : tel-03130513, version 1

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Younes El Hachi. Approche couplée de diffraction à haute énergie et de modélisation numérique pour l’étude multi-échelles du comportement superélastique d’un alliage à mémoire de forme Cu-Al-Be. Matériaux. HESAM Université, 2020. Français. ⟨NNT : 2020HESAE039⟩. ⟨tel-03130513⟩

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