Journal of the Japan Society for Composite Materials
Online ISSN : 1884-8559
Print ISSN : 0385-2563
ISSN-L : 0385-2563
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Volume 23, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    Yasuhiro YAMAGUCHI
    1997 Volume 23 Issue 3 Pages 81-86
    Published: May 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.81
    JOURNAL FREE ACCESS
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  • Evaluation of Adhesion between Carbon Fiber and Polypropylene by Microbond Method
    Fumiaki TOMONAGA, Kazuo YAMADA, Koichi ISHIDA, Mitsuyoshi FUJIYAMA
    1997 Volume 23 Issue 3 Pages 87-91
    Published: May 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.87
    JOURNAL FREE ACCESS
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    Application of the microbond method to thermoplastics was investigated. Adhesion (shear strength) between carbon fiber and various polypropylenes (PP) was evaluated by the microbond method. Optimum measurement conditions such as the conditioning time from droplet application to measurement and the embedded length of the fiber in the resin and the effect of viscosity (melt flow index) of the resin were studied. Shear strength was measured successfully for conditions of an embedded length from 100 to 250 μm and of a time of 3 or 4 days. In order to improve the adhesion, a maleic anhydride-grafted PP (MPP) was mixed with PP and carbon fiber was treated by various plasmas. Addition of MPP to PP increased the shear strength by 50% for untreated carbon fiber and by 70% for O2 plasma treated carbon fiber.
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  • Testing Method for Evaluation of Mode II Fatigue Delamination Growth Behaviors of Advanced Composite Materials by Applying CSD Measurement
    Zheng-Wang LI, Isao KIMPARA, Kazuro KAGEYAMA, Toshio SUZUKI, Isamu OHS ...
    1997 Volume 23 Issue 3 Pages 92-99
    Published: May 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.92
    JOURNAL FREE ACCESS
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    The crack shear displacement (CSD) is theoretically four times sensitive to the crack propagation than that of the load point displacement. In this paper based on CSD measurement, a new testing method for mode II fatigue delamination growth of unidirectional CFRP laminates was developed. Mode II fatigue tests are conducted by applying the end-notched flexure (ENF) specimen and controlled by a computer through the parameter of maximum mode II energy release rate (GIImax). The crack length and the GIImax were measured through the CSD compliance. In order to measure the CSD with a high accuracy, experimental techniques, such as selection of the gage, mounting method of the gage and methods for preventing the ENF specimen from shifting during fatigue, were fully examined. Especially, with the solution of the friction problem which exists between the surfaces of the mode II crack, the accuracy and the stability of the CSD measurement have been greatly improved. As test conditions, the influence of the loading frequency and the suitable range of the normalized GIImax gradient of the GIImax-shedding test were also discussed.
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  • Bearing Failure Monitoring of C/C Composites with an Attached Optical Fiber
    Jun TAKAHASHI, Masato NOMURA, Hiroshi TSUDA, Shintaro KITADE, Hideki N ...
    1997 Volume 23 Issue 3 Pages 100-107
    Published: May 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.100
    JOURNAL FREE ACCESS
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    To realize future transport such as SST (HSCT), HST and space plane, we have to develop drastic technologies for lightening weight and assuring reliability of composite structures. In this connection, authors have studied damage monitoring techniques for composite structures by using fiber optic methods. In this paper, we investigated a possibility of bearing failure monitoring of the bolted joints of C/C composites by detecting the breaking of an attached optical fiber. Results obtained are summarized as follows: (1) Damage cannot be detected unless the plastic coating of optical fibers is stripped. (2) When attaching the stripped optical fiber longitudinally to the loading direction, bearing and net tension failure can be detected though shear-out failure cannot be detected. (3) When attaching the stripped optical fiber transversely to the loading direction, both bearing and shear-out failure can be always detected. There is a proportional correlation between the distance from the optical fiber to hole edge and the pin displacement at optical fiber breaking. This attached type fiber optics is effective to apply to the practical structure monitoring, i.e., not only high temperature composite structures but also some kinds of infrastructures.
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  • [title in Japanese]
    Yutaka KAGAWA
    1997 Volume 23 Issue 3 Pages 108-113
    Published: May 15, 1997
    Released on J-STAGE: February 08, 2010
    DOIhttps://doi.org/10.6089/jscm.23.108
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Kenji KUBOMURA, Yoshikazu IZUMIHARA, Kenzou SAWADA, Tsuguo ISHIDA, Yau ...
    1997 Volume 23 Issue 3 Pages 114-118
    Published: May 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.114
    JOURNAL FREE ACCESS
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