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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/118147

    Title: Investigation on the Fiber Orientation Distributions and Their Influence on the Mechanical Property of the Co-Injection Molding Products
    Authors: Huang, Chao-Tsai;Chen, Xuan-Wei;Fu, Wei-Wen
    Keywords: co-injection molding;fiber reinforced plastics (FRP);fiber orientation distribution (FOD);micro-computerized tomography (µ-CT) scan technology
    Date: 2019-12-20
    Issue Date: 2020-03-02 12:10:12 (UTC+8)
    Publisher: MDPI
    Abstract: In recent years, due to the rapid development of industrial lightweight technology, composite
    materials based on fiber reinforced plastics (FRP) have been widely used in the industry. However, the
    environmental impact of the FRPs is higher each year. To overcome this impact, co-injection molding
    could be one of the good solutions. But how to make the suitable control on the skin/core ratio
    and how to manage the glass fiber orientation features are still significant challenges. In this study,
    we have applied both computer-aided engineering (CAE) simulation and experimental methods to
    investigate the fiber feature in a co-injection system. Specifically, the fiber orientation distributions
    and their influence on the tensile properties for the single-shot and co-injection molding have been
    discovered. Results show that based on the 60:40 of skin/core ratio and same materials, the tensile
    properties of the co-injection system, including tensile stress and modulus, are a little weaker than
    that of the single-shot system. This is due to the overall fiber orientation tensor at flow direction (A11)
    of the co-injection system being lower than that of the single-shot system. Moreover, to discover and
    verify the influence of the fiber orientation features, the fiber orientation distributions (FOD) of both
    the co-injection and single-shot systems have been observed using micro-computerized tomography
    (µ-CT) technology to scan the internal structures. The scanned images were further utilizing Avizo
    software to perform image analyses to rebuild the fiber structure. Specifically, the fiber orientation
    tensor at flow direction (A11) of the co-injection system is about 89% of that of the single-shot system in
    the testing conditions. This is because the co-injection part has lower tensile properties. Furthermore,
    the difference of the fiber orientation tensor at flow direction (A11) between the co-injection and the
    single-shot systems is further verified based on the fiber morphology of the µ-CT scanned image.
    The observed result is consistent with that of the FOD estimation using µ-CT scan plus image analysis.
    Relation: Polymers 12(1), 24
    DOI: 10.3390/polym12010024
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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