Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 71, Issue 12
Journal of the Society of Fiber Science and Technology
Displaying 1-13 of 13 articles from this issue
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Reviews and News
Foreword
Review
Series of Fiber Basic Course Lectured by Professional Engineers-15
Serise of Historical Reviews of Japanese Textile Industry Supported by the Technology-History of the Production, Sales, and Product Development-27
Report
Foreign News Letter
Original Articles
Transactions
  • Fatigue Fracture Properties of Wood Plastic Composites
    Nordin M. N. A. , Yuta Makino, Koichi Goda, Hirokazu Ito
    2015 Volume 71 Issue 12 Pages 339-344
    Published: December 10, 2015
    Released on J-STAGE: December 10, 2015
    DOIhttps://doi.org/10.2115/fiber.71.339
    JOURNAL FREE ACCESS
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    Fatigue fracture properties of wood plastic composites (WPC) were investigated. The material was based on a wood flour/ polypropylene (PP) master batch, and prepared to be 30wt％ and 50wt％ wood flour contents by the addition of PP pellets. First, kneading temperature and screw speed of a uni‐axial extruder were changed in some conditions, and 190℃ and 20rpm were decided from tensile test of the injection‐molded WPC specimens as the optimum manufacturing conditions. Next, tensile and fatigue tests were carried out for WPC specimens with 30wt％ and 50wt％ wood flour contents. The resultant tensile strength and fatigue life were largely improved as compared to neat PP specimens. When a lump of the master batch remained in the WPC specimen, the strength and life were reduced. It should be noted that, while fatigue life of the neat PP specimens was only 10 to 102 cycles to failure range at 30MPa maximum cyclic stress, those of WPC specimens with 30wt％ and 50wt％ contents were drastically extended to 103 to 104, and 105 to 106 cycles to failure, respectively. It was estimated that the major cause of fatigue damage in WPC specimens was craze occurring in the matrix, which initiated near the specimen surface, extended into the inner, and finally led to the unstable fracture.
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  • Relationship between Internal Structural Parameters and Cross‐Sectional Geometry for Designing Braided Composite Structure
    Akio Ohtani, Yasuyoshi Kakita, Masaru Imamura, Asami Nakai
    2015 Volume 71 Issue 12 Pages 345-350
    Published: December 10, 2015
    Released on J-STAGE: December 10, 2015
    DOIhttps://doi.org/10.2115/fiber.71.345
    JOURNAL FREE ACCESS
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    In this study, aspect ratio and major axis of fiber bundle cross‐section of braiding yarns, and gap between braiding yarns obtained from cross‐sectional observation were approximated as a function of distance between braiding yarns. And the prediction method of interrelationship between internal structures for designing braided composites was proposed. In addition, the prediction method were utilized to predict thickness of layered braided fabrics considering nesting of each layers for designing stiffness of braided composite structure.
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