繊維学会誌
Online ISSN : 1884-2259
Print ISSN : 0037-9875
71 巻, 12 号
繊維学会誌
選択された号の論文の13件中1~13を表示しています
繊維と工業
時評
解説
連載〈業界マイスターに学ぶせんいの基礎講座-15〉
繊維学会創立70周年記念連載〈技術が支えた日本の繊維産業-生産・販売・商品開発の歩み-27〉
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  • M. N. A. Nordin, 槇野 裕太, 合田 公一, 伊藤 弘和
    2015 年 71 巻 12 号 p. 339-344
    発行日: 2015/12/10
    公開日: 2015/12/10
    ジャーナル フリー
    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.
  • 大谷 章夫, 柿田 恭良, 今村 勝, 仲井 朝美
    2015 年 71 巻 12 号 p. 345-350
    発行日: 2015/12/10
    公開日: 2015/12/10
    ジャーナル フリー
    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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