Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 34, Issue 11
Displaying 1-11 of 11 articles from this issue
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Index
Foreword
Technical Notes : Special Issue on Surface Treatment of Polymers
Technical Report
Principia
Visiting Active Companies
Original Paper
  • Verification of Fiber Orientation Mechanism by Resin Flow Behavior in the Flow Front Confluence Region
    Shogo Ogura, Masahiro Seto, Masashi Yamabe
    2022 Volume 34 Issue 11 Pages 428-433
    Published: October 20, 2022
    Released on J-STAGE: November 20, 2022
    DOIhttps://doi.org/10.4325/seikeikakou.34.428
    JOURNAL FREE ACCESS
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    Fiber Reinforced Thermo Plastic (FRTP) is used in transportation equipment due to its high strength. However, injection molded FRTP exhibits anisotropic mechanical properties due to fiber orientation caused by resin flow. In order to accurately predict the properties of actual part shapes, it is necessary to clarify the mechanism of complex fiber orientation due to flow. In a previous study, experiments were conducted using a flat plate and a complex flow model. As a result, it was confirmed that a specific flow direction orientation appeared in the resin flow where the flow fronts merge, and the mechanism of fiber orientation was investigated. In this study, we measured the velocity distribution and velocity history of the resin to verify the orientation mechanism. As a result, it was found that some fibers are oriented by shear flow near the wall surface and others are oriented by elongation flow in the center of the wall thickness, and that the orientation behavior and the factors contributing to the orientation are different for each. In order to control the fiber orientation, it is necessary to clarify the factors that have a large influence on each orientation.

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