Linking simulations and experiments for the multiscale tracking of thermally induced martensitic phase transformation in NiTi SMA
AffiliationCivil Engineering and Engineering Mechanics, University of Arizona
Materials Science and Engineering, University of Arizona
martensitic phase transformation
phase field simulations
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PublisherIOP PUBLISHING LTD
CitationLinking simulations and experiments for the multiscale tracking of thermally induced martensitic phase transformation in NiTi SMA 2016, 24 (7):075006 Modelling and Simulation in Materials Science and Engineering
Rights© 2016 IOP Publishing Ltd
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AbstractMartensitic phase transformation in NiTi shape memory alloys (SMA) occurs over a hierarchy of spatial scales, as evidenced from observed multiscale patterns of the martensitic phase fraction, which depend on the material microstructure and on the size of the SMA specimen. This paper presents a methodology for the multiscale tracking of the thermally induced martensitic phase transformation process in NiTi SMA. Fine scale stochastic phase field simulations are coupled to macroscale experimental measurements through the compound wavelet matrix method (CWM). A novel process for obtaining CWM fine scale wavelet coefficients is used that enhances the effectiveness of the method in transferring uncertainties from fine to coarse scales, and also ensures the preservation of spatial correlations in the phase fraction pattern. Size effects, well-documented in the literature, play an important role in designing the multiscale tracking methodology. Molecular dynamics (MD) simulations are employed to verify the phase field simulations in terms of different statistical measures and to demonstrate size effects at the nanometer scale. The effects of thermally induced martensite phase fraction uncertainties on the constitutive response of NiTi SMA is demonstrated.
Note12 month embargo; Published 29 September 2016
VersionFinal accepted manuscript
SponsorsUniversity of Arizona; THALES/INTERMONU-Project from European Union (European Science Foundation-ESF) [68/1117]