Application of Regularized Digital Images Correlation Analysis to the Tensile Test of NiTi Shape Memory Alloy: Application de la corrélation d'images régularisé pour 1D tensile test sur l'alliage à memoire de forme type NiTi

Abstract : Shape Memory Alloys (SMA) undergo an austenite-martensite solid-solid phase transformation which confers its super-elastic and shape memory behaviors. Phase transformation can be induced either by stress or temperature changes, thus indicating a strong thermomechanical coupling. Until now, the increasing use of SMA for complex applications requires a robust multiphysic and multiaxial modeling of phenomena governing their behaviors. 1D tensile loading test is applied to a small strip specimen made of NiTi SMA (Ni 49.8 at%). During the tensile test, phase transformation of SMA occurs in the form of strain localization bands. Despite of the progress in Digital Images Correlation techniques (DIC), the measurement of strain localization remains challenging for small size samples addressed in this study. It is shown how the introduction of the Regularized Digital Images Correlation (R-DIC) is relevant for such measurement by offering a better spatial resolution and shorter computation times.
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Xuyang Chang, Mame Daro Fall, Karine Lavernhe Taillard, Olivier Hubert. Application of Regularized Digital Images Correlation Analysis to the Tensile Test of NiTi Shape Memory Alloy: Application de la corrélation d'images régularisé pour 1D tensile test sur l'alliage à memoire de forme type NiTi. 23ème Congrès Français de Mécanique 2017, Aug 2017, Lille, France. ⟨hal-01559845⟩

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