Flow induced microstructure in composite materials

Hemant K. Kini, YoChan Kim, Chinh T. Nguyen, André Bénard, Charles A. Petty

    Research output: ResearchConference contribution

    Abstract

    Flow-induced alignment of the dispersed phase of a composite material during processing determines the local microstructure and, thereby, the mechanical and transport properties of the final product. Model predictions of the microstructure are often based on low-order statistical properties of Smoluchowski's equation for the orientation distribution function. A second-order moment equation relates the orientation dyad to the local flow field and the orientation tetrad. Unfortunately, this approach for predicting the microstructure has been limited by the absence of a practical and accurate closure model for the orientation tetrad. This research examines flow-induced alignment of fiber suspensions and liquid crystalline polymers by using a closure approximation that retains the six-fold symmetry and six-fold projection properties of the exact orientation tetrad. In the absence of deformation, the theory predicts multiple equilibrium states. In the presence of a homogeneous shear flow, the orientation director shows periodic behavior at relatively high concentration of the dispersed phase.

    LanguageEnglish (US)
    Title of host publicationTechnical Paper - Society of Manufacturing Engineers
    Pages183-192
    Number of pages10
    StatePublished - 2004
    EventICCM-14 - San Diego, CA, United States
    Duration: Jul 14 2003Jul 18 2003

    Other

    OtherICCM-14
    CountryUnited States
    CitySan Diego, CA
    Period7/14/037/18/03

    Profile

    Microstructure
    Composite materials
    Liquid crystal polymers
    Shear flow
    Transport properties
    Distribution functions
    Flow fields
    Mechanical properties
    Fibers
    Processing

    Keywords

    • Closure approximation
    • Equilibrium states
    • Flow induced alignment
    • Liquid crystalline polymers
    • Orientation statistics
    • Simple shear

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Kini, H. K., Kim, Y., Nguyen, C. T., Bénard, A., & Petty, C. A. (2004). Flow induced microstructure in composite materials. In Technical Paper - Society of Manufacturing Engineers (pp. 183-192)

    Flow induced microstructure in composite materials. / Kini, Hemant K.; Kim, YoChan; Nguyen, Chinh T.; Bénard, André; Petty, Charles A.

    Technical Paper - Society of Manufacturing Engineers. 2004. p. 183-192.

    Research output: ResearchConference contribution

    Kini, HK, Kim, Y, Nguyen, CT, Bénard, A & Petty, CA 2004, Flow induced microstructure in composite materials. in Technical Paper - Society of Manufacturing Engineers. pp. 183-192, ICCM-14, San Diego, CA, United States, 7/14/03.
    Kini HK, Kim Y, Nguyen CT, Bénard A, Petty CA. Flow induced microstructure in composite materials. In Technical Paper - Society of Manufacturing Engineers. 2004. p. 183-192.
    Kini, Hemant K. ; Kim, YoChan ; Nguyen, Chinh T. ; Bénard, André ; Petty, Charles A./ Flow induced microstructure in composite materials. Technical Paper - Society of Manufacturing Engineers. 2004. pp. 183-192
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