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 28, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    Woo Il LEE
    2002 Volume 28 Issue 4 Pages 129-133
    Published: July 15, 2002
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.28.129
    JOURNAL FREE ACCESS
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  • Effects of Loads and Damages on the Gas Diffusivity of CFRP Laminates
    Tomohiro YOKOZEKI, Takahira AOKI, Yoichi HAYASHI, Takashi ISHIKAWA
    2002 Volume 28 Issue 4 Pages 134-139
    Published: July 15, 2002
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.28.134
    JOURNAL FREE ACCESS
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    The through-thickness gas diffusion properties of CFRP laminates are measured at room temperature using tubular specimens. For time efficiency, a simple measuring method based on Fick's law of isotropic solids is applied to composite laminates and its effectiveness is clarified by comparing with experimentally obtained properties. The helium diffusion in the presence of uniaxial loads and/ or matrix cracks is also investigated and it is shown that apparent gas diffusion properties increase in conjunction with increase of loads or damages. An analytical model based on thermodynamics and continuum damage mechanics is applied to apparent diffusion properties of laminates in the presence of matrix cracks and loads. Finally, comparisons with test data are provided for model verifications.
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  • Composite Resin with Polymethyl Methacrylate Using the Spontaneous Polymerization Activity of Superconductor
    Masakazu TATSUMI, Akiko MIKI, Masafumi YANO
    2002 Volume 28 Issue 4 Pages 140-145
    Published: July 15, 2002
    Released on J-STAGE: February 08, 2010
    DOIhttps://doi.org/10.6089/jscm.28.140
    JOURNAL FREE ACCESS
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    In this report the spontaneous polymerization of vinyl monomer using the superconductor YBa2 Cu3O7-δ was studied. It is known that superconducting characters of this material is influenced by conditions of oxidation in the synthetic process. Although the superconductivity transition temperature, Tc of fully oxidized YBa2Cu3O7 (Y7) is about 90K, this material is transferred to a semiconductor YBa2Cu3O6 (Y6) with tetragonal structure upon reduction at high temperature and under low oxygen pressure. The Y7 could be dispersed in the polymerization of methyl methacrylate (MMA), but not for the Y6. Thus the PMMA with the powder of Y7 was composed. The process of the polymerization is the free radical chain reaction. The composite resin itself is an insulator, but the Tc is observed by the measurement of alternating current susceptibility. The Tc of the superconductor in the matrix resin is almost similar to that of assintered. The superconductor in the composite resin has water proofness and thermostability.
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  • Upgrading Method of RC Flexural Structures with Externally Prestressed PBO Fiber Sheets
    Zhishen WU, Kentaro IWASHITA, Keiji HAYASHI, Tetsuro HIGUCHI, Shinkich ...
    2002 Volume 28 Issue 4 Pages 146-155
    Published: July 15, 2002
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.28.146
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    In recent years, a new strengthening method of concrete structures with externally prestressed carbon fiber sheets (CFS) has been developed and the reinforcement effects are confirmed through a series of experimental investigations. However, the theoretically expected gains from CFS may not be attained due to its lower capacity of energy absorption. This study aims at confirming the reinforcement effects of strengthening system by adapting newly developed PBO (short for Polypara-phenylene-benzo-bis-oxazole) fiber sheets (PFS), which present equal or higher strength and stiffness in comparison with CFS and higher capacity of energy adsorption. Through investigating the reinforcement effects influenced by the main parameters such as the prestress levels, concrete compressive strength, the number of PFS, and comparing with those of CFS, it can be indicated that the prestressing system of PFS will be an effective and promising method to strengthen or upgrade concrete structures.
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  • [title in Japanese]
    Hiroshi TSUDA
    2002 Volume 28 Issue 4 Pages 156
    Published: July 15, 2002
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.28.156
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Masashi TANAKA
    2002 Volume 28 Issue 4 Pages 157-161
    Published: July 15, 2002
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.28.157
    JOURNAL FREE ACCESS
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