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Modélisation du comportement thermomécanique d'alliages à mémoire de forme. Application au dimensionnement de microsystèmes et extension en non local

Abstract : A constitutive thermomechanical model for the behavior of shape memory alloys is presented. It takes into account the martensitic phase transformation, the orientation of martensite variants and the inelastic accommodation of twins inside self-accommodated martensite. A thermodynamical potential is built using three internal variables described at macroscopic scale. Driving forces are derived from this potential and the equilibrium is reached by considering dissipative phenomena. The model is then implemented into a finite element code in order to design two or three-dimensional structures. It was adopted as a fundamental for a non-local description of the superelastic behavior in order to take into account the localization phenomenon observed in SMA wires and thin films. Specific finite elements are developed to account with this type of approach in the framework of structures computation.
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https://tel.archives-ouvertes.fr/tel-01748289
Contributor : Arnaud Duval <>
Submitted on : Wednesday, January 6, 2010 - 5:03:11 PM
Last modification on : Friday, May 18, 2018 - 9:59:26 AM
Long-term archiving on: : Thursday, October 18, 2012 - 12:05:37 PM

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  • HAL Id : tel-01748289, version 2

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Arnaud Duval. Modélisation du comportement thermomécanique d'alliages à mémoire de forme. Application au dimensionnement de microsystèmes et extension en non local. Mécanique [physics.med-ph]. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10132⟩. ⟨tel-01748289v2⟩

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