Etude du comportement thermomécanique des Alliages à Mémoire de Forme sous sollicitations multiaxiales complexes

Abstract : The specific behaviour of Shape Memory Alloys (SMA) is due to a solid-solid transformation called martensitic transformation. This reversible transformation consists mainly in a shear without volume change and is activated either by stress or temperature. Despite all the properties of SMA are well known for one-dimensional mechanical loadings, the modelling of the 3D behaviour remains difficult.
In a first step, we consider the experimental validation of a conjecture concerning the proportionality of the equivalent transformation strain with the martensite volume fraction. Therefore we perform tension-compression-torsion tests coupled with electrical resistance measurements on a Cu-Al-Be SMA. The behaviour of this alloy is sharply influenced by its crystallographic texture.
Otherwise, numerical simulations on different textures and for several multiaxial loadings are performed. The experimental database is so completed in order to validate the choices made for the modelling.
Finally, we perform several tension-torsion proportional and non-proportional, non-isothermal tests on a Ni-Ti SMA. The existence of an equivalent stress, able to describe the yield stress for phase-R reorientation is so highlighted.
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Submitted on : Friday, December 21, 2007 - 7:20:07 PM
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Karine Lavernhe Taillard. Etude du comportement thermomécanique des Alliages à Mémoire de Forme sous sollicitations multiaxiales complexes. Mécanique [physics.med-ph]. École normale supérieure de Cachan - ENS Cachan, 2006. Français. ⟨tel-00200906⟩

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