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Etude micromécanique du comportement thermomécanique des alliages à mémoire de forme

Abstract : Shape memory alloys (SMA) present a superthermoelastic behavior, i.e. they are able to be strained one hundred times more than classical alloys. This strain appears by mechanical loading (isothermal superelasticity) or by temperature variations (non isothermal creep). SMA's very particular properties are linked to a diffusionless solid-solid phase transformation (martensic transformation) during which a praent phase (austenite)becomes a product phase (martensite). This transformation is cristallographically reversible. Determination of constitutive law and behavior's models are an important step for industrial applications of these materials. Aim of this work is to model the superthermoelastic behavior using a micromechanical approach. Physical micromechanisms responsible of the behavior are taken into account in the description of the behavior at the microscopic level. Using an adapted scale transition method (self-consistent one), the macroscopic behavior is determined. An experimental study performed on a cupper-aluminium-berylium alloy allows to characterize in stress-temperature diagram some single and polycristal materials having the same composition. Experimental and numerical results are in good agreement. Furthermore, it's possible to get informations on the microstructure evolution in all the grains that are constituing the polycristal
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Submitted on : Tuesday, April 24, 2018 - 4:12:29 PM
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  • HAL Id : tel-01777144, version 1



Denis Entemeyer. Etude micromécanique du comportement thermomécanique des alliages à mémoire de forme. Sciences de l'ingénieur [physics]. Université Paul Verlaine - Metz, 1996. Français. ⟨NNT : 1996METZ035S⟩. ⟨tel-01777144⟩



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