Simulations of localized thermo-mechanical behavior in a NiTi shape memory alloy

Previous experiments have shown that stress-induced martensitic transformation in certain polycrystalline NiTi shape memory alloys can lead to strain localization and propagation phenomena when loaded in uniaxial tension. The number of nucleation events and kinetics of transformation fronts were fou...

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Bibliographic Details
Published in:International journal of plasticity 2000-01, Vol.16 (5), p.541-562
Main Author: Shaw, John A.
Format: Article
Language:English
Subjects:
Constitutive behavior
Finite elements
Localization
Phase transformation
Shape memory alloy
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Summary:Previous experiments have shown that stress-induced martensitic transformation in certain polycrystalline NiTi shape memory alloys can lead to strain localization and propagation phenomena when loaded in uniaxial tension. The number of nucleation events and kinetics of transformation fronts were found to be sensitive to the nature of the ambient media and imposed loading rate due to the release/absorption of latent heat and the material's inherent temperature sensitivity of the transformation stress. A special plasticity-based constitutive model used within a 3-D finite element framework has previously been shown to capture the isothermal, purely mechanical front features seen in experiments of thin uniaxial NiTi strips. This paper extends the approach to include the thermo-mechanical coupling of the material with its environment. The simulations successfully capture the nucleation and evolution of fronts and the corresponding temperature fields seen during the experiments.
ISSN:0749-6419
1879-2154
DOI:10.1016/S0749-6419(99)00075-3