Analyse numérique et expérimentale du comportement d'un alliage à mémoire de forme avec précipités (Ni47 Ti44 Nb9) : Application à la connectique

Abstract : Niobium ductile precipitates included in Ni47Ti44Nb9 shape memory alloy broaden transformation hysteresis after a particular treatment. The increase of reverse transformation temperature can reach 80 °C. This feature is attractive for industrial applications, including tightening rings. A thermomechanical model is presented. It is based on experimental observations to characterize the alloy, considered as a composite whose matrix is composed of NiTi with shape memory alloy behavior and inclusions of niobium with elastic-plastic behavior. The Mori-Tanaka transition scale technique results in a macro-homogeneous behavior law formulation. This model is implemented in a finite element code. Clamping devices are realized experimentally and modelled numerically to validate the model.
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Boris Piotrowski. Analyse numérique et expérimentale du comportement d'un alliage à mémoire de forme avec précipités (Ni47 Ti44 Nb9) : Application à la connectique. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10011⟩. ⟨tel-01748213⟩

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