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    On micro to mesoscale homogenization of electrical properties for damaged laminated composites (and their potential applications in electrical tomography)

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    Description:
    Final Dissertation
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    Type
    Dissertation
    Authors
    Selvakumaran, Lakshmi cc
    Advisors
    Lubineau, Gilles cc
    Committee members
    Hoteit, Ibrahim cc
    Thoroddsen, Sigurdur T cc
    Samtaney, Ravi cc
    Prudhomme, Serge M.
    Kostopoulos, Vassilis
    Program
    Mechanical Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2015-12
    Permanent link to this record
    http://hdl.handle.net/10754/592653
    
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    Abstract
    Efficient and optimal use of composites in structures requires tools to monitor and capture the complex degradation that can occur within the laminates over time. Structural health monitoring (SHM) techniques uses sensors/actuators on the structure to progressively monitor the health of the structure with minimal manual intervention. Electrical tomography (ET) is a SHM technique that uses voltage measurements from the surface of the laminate to reconstruct a conductivity map of the structure. Since damage has been shown to modify the conductivity of the laminate, the conductivity map can provide an indirect measure of the damage within the material. Studies have shown the capability of ET to identify macroscale damage due to impact. But, little has been done to quantitatively assess damage using ET. In this work, we present a theoretical framework to link degradation mechanisms occuring at the microscale to the conductivity at the mesoscale through damage indicators. The mesoscale damage indicators are then shown to be intrinsic to the ply. Next, we use the knowledge obtained through mesoscale homogenization to study the detectability of transverse cracks. Last, we show how the mesoscale homogenization participates in regularization of the inverse problem and in the quantitative assessment of the reconstructed conductivity map. This is as such the first step towards turning ET into a viable quantitative health monitoring technique.
    Citation
    Selvakumaran, L. (2015). On micro to mesoscale homogenization of electrical properties for damaged laminated composites (and their potential applications in electrical tomography). KAUST Research Repository. https://doi.org/10.25781/KAUST-04P95
    DOI
    10.25781/KAUST-04P95
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-04P95
    Scopus Count
    Collections
    PhD Dissertations; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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