Modélisation du comportement macroscopique des alliages à mémoire de forme : application aux matériaux composites

Abstract : The purpose of the dissertation work is to determine the thermomechanical behavior of shape memory alloys (SMAs) based composites structures. A macroscopic model, developed in the framework of thermodynamics of irreversible process, is developed in order to model the behavior of the SMA phase. This model deals with several key features of SMAs behavior, like tension-compression asymmetry, partial cycles and the behavior of the formed self-accommodated martensite. A comparison with several experimental database show a good prediction capability of the model, and opens a discussion on additional features to take into account using finite element analysis, the behavior of SMA-based composite material is computed. This methodology is applied for two cases ; the first one is the study of an elastomeric ribbon reinforced with snake-like shape SMA fibers. The second case considers the impact of precipitation (Ni4Ti3) on the macroscopic behavior in Ni-rich NiTi SMAs. A reference unit cell is defined, and the macroscopic behavior is estimated considering a variation of material properties throughout the cell as a function of the chemical composition. In both cases, the model provides interesting information on stress and stra fields, as well as on the global behavior
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Yves Chemisky. Modélisation du comportement macroscopique des alliages à mémoire de forme : application aux matériaux composites. Autre. Université Paul Verlaine - Metz, 2009. Français. ⟨NNT : 2009METZ043S⟩. ⟨tel-01752667⟩

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