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Modélisation du comportement thermomécanique d'un alliage à mémoire de forme à base de fer type Fe-Mn-Si

Abstract : It is well known that Shape Memory Alloys (SMA) are a particular class of materials that can recover a memorized shape by simple heating. This remarkable property, called the Shape Memory Effect (SME), can be exploited in the design of original applications in order to find attractive solutions to problems encountered in various industrial fields. We propose a thermo-mechanical three-dimensional constitutive law adapted to Fe-based shape memory alloys. It takes into account the effect of the martensitic transformation and the plastic slip mechanisms and their interaction. The adopted formulation is based on a simplified micromechanical description. The macroscopic behaviour is derived by considering the equivalent homogeneous effect on a representative volume element. The Gibbs free energy expression is defined. Thermodynamic driving forces are then derived and compared to critical forces leading to the constitutive equations solved by Newton?Raphson numerical scheme. Obtained results for thermo-mechanical loadings are compared to experimental ones.
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https://hal.univ-lorraine.fr/tel-01748295
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Fatma Jemal. Modélisation du comportement thermomécanique d'un alliage à mémoire de forme à base de fer type Fe-Mn-Si. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10135⟩. ⟨tel-01748295⟩

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