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    Stability and simulations of insonated contrast agents-effect of the constitutive law

    Access Status
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    Authors
    Pelekasis, N.
    Efthimiu, K.
    Tsigklifis, Konstantinos
    Date
    2011
    Type
    Conference Paper
    
    Metadata
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    Citation
    Pelekasis, N. and Efthimiu, K. and Tsigklifis, K. 2011. Stability and simulations of insonated contrast agents-effect of the constitutive law, pp. 2473-2477.
    Source Title
    Proceedings of Forum Acusticum
    ISSN
    2221-3767
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/55121
    Collection
    • Curtin Research Publications
    Abstract

    Under insonation contrast agents are known to exhibit dynamic patterns such as thresholding, compression only behavior, diffusion and deflation, shape deformation, buckling, jetting and break-up, not all of which can be adequately predicted based on a single model describing the mechanics of the coating. Strain softening and strain hardening behavior in the presence of a folding instability are investigated as a means to understand compression only behavior in conjunction with the high harmonic content often recorded in optical and acoustic measurements of pulsating contrast agents coated by a phospholipid monolayer. Numerical simulations are presented that capture shape mode excitation and buckling of the coating and an association is made with the above phenomena.

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