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    Linking simulations and experiments for the multiscale tracking of thermally induced martensitic phase transformation in NiTi SMA

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    Author
    Gur, Sourav
    Frantziskonis, George N
    Affiliation
    Civil Engineering and Engineering Mechanics, University of Arizona
    Materials Science and Engineering, University of Arizona
    Issue Date
    2016-10-01
    Keywords
    NiTi SMA
    martensitic phase transformation
    phase field simulations
    multiscale coupling
    predictive CWM
    size effect
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Linking 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
    Journal
    Modelling and Simulation in Materials Science and Engineering
    Rights
    © 2016 IOP Publishing Ltd.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Martensitic 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.
    Note
    12 month embargo; Published 29 September 2016
    ISSN
    0965-0393
    1361-651X
    DOI
    10.1088/0965-0393/24/7/075006
    Version
    Final accepted manuscript
    Sponsors
    University of Arizona; THALES/INTERMONU-Project from European Union (European Science Foundation-ESF) [68/1117]
    Additional Links
    http://stacks.iop.org/0965-0393/24/i=7/a=075006?key=crossref.733c8d8df73ca580f8ae71e97350a0f1
    ae974a485f413a2113503eed53cd6c53
    10.1088/0965-0393/24/7/075006
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    UA Faculty Publications

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