%0 Conference Proceedings
%T Thermomechanical analysis of the deformation in tension of a nanocrystalline superelastic NiTi thin wire
%+ Techniques de l'Ingénierie Médicale et de la Complexité - Informatique, Mathématiques et Applications, Grenoble - UMR 5525 (TIMC-IMAG)
%+ Laboratoire de Mécanique et Génie Civil (LMGC)
%+ ThermoMécanique des Matériaux (ThM2)
%A Ramos de Oliveira, Henrique Martinni
%A Louche, Hervé
%A Favier, Denis
%< avec comité de lecture
%B 10th European Solid Mechanics Conference
%C Bologne, Italy
%8 2018-07-02
%D 2018
%K Full-field kinematic and thermal approach
%K enthalpy of transformation
%K superelastic NiTi
%Z Engineering Sciences [physics]/Materials
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph]
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph]Conference papers
%X Manufacturing processes of NiTi Shape Memory Alloys (SMA) wires induce a complexmicrostructure with a mix between amorphous phase and highly strained nanocrystals [1]. Such amaterial, a cold worked Ti 50.8 at.% Ni wire with a diameter 0.5mm, was studied during a tensileloading. Before loading, a heat treatment at 325°C for 30min, which is bellow the recrystallizationtemperature (~350°C), was applied. Thanks to these relative low heat treatment temperature,comparatively to the usual ones around 500°C, no strain localization was observed. Latent heatmeasurement during a thermal induced transformation was impossible through a DSC because anypeak can be observed. However, the knowledge of latent heat is important in some applications,i.e. elastocaloric effect [2], where temperature variations are expected.Our presentation will show a method to estimate this latent heat during a stress induced phasetransformation. From experimental full field measurements, thermal and kinematics, and using aprocessing presented in previous papers ([3-4]) we performed a heat balance in order to calculatethermal power and thermal energy induced by a tensile loading. From these results and athermodynamic approach, it was possible to estimate: (i) the forward and reverse phasetransformation enthalpies, (ii) the ratio between inelastic thermal power and mechanical power,(iii) the martensite fraction in function of strain or stress.
%G English
%L hal-01816031
%U https://hal.umontpellier.fr/hal-01816031
%~ UGA
%~ IMAG
%~ CNRS
%~ INPG
%~ LMGC
%~ TIMC-IMAG
%~ TIMC-IMAG-BIOMMAT
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UNIV-LYON
%~ UGA-COMUE
%~ UM-2015-2021
%~ TEST3-HALCNRS