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 18, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • A Method for Solutions of Characteristic Equation for End Crack of Reinforcement Rigid-Fiber of Composite Materials
    H. ISHIKAWA, Y. KOHNO
    1992 Volume 18 Issue 2 Pages 55-59
    Published: March 15, 1992
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.18.55
    JOURNAL FREE ACCESS
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    The plane strain elastostatic problem for the end crack of reinforcement rigid-fiber of composite materials is examined. A method to solve the characteristic equation obtained from the eigen function expansion method of stress functions is derived. Power numbers of all terms in infinite series of the stress functions are estimated.
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  • Issues of 3-Point and 4-Point Modes in Flexural Testing Methods for Advanced Composite Materials
    H. IWAI, M. UEMURA, T. HAYASHI
    1992 Volume 18 Issue 2 Pages 60-65
    Published: March 15, 1992
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.18.60
    JOURNAL FREE ACCESS
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    The flexural testing methods for advanced composite materials have not yet been authorized internationally. In the present paper, the effects of various factors such as loading mode, span length, specimen size, radius of loading nose and control mode of loading etc. on the static and fatigue flexural properties were discussed in the experiments under the 3-point, 4-point bendings and pure bending. The specimens were the unidirectional carbon-fiber-reinforced plastics and the failures took place beneath the loading noses due to stress concentration in both 3-point and 4-point bending methods and the finite element method analysis were performed in order to explain the experimental results. Accordingly, it was found that the pure bending testing method is the best and the 3-point and 4-point methods are not recommended. If the experi-ment in 3-point or 4-point bending is inevitably performed, a film should be inserted beneath a loading nose which gives the reasonable strength by alleviating the stress concentration.
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  • Degradation Behavior of Unsaturated Polyester Resin in Alcohols
    H. HOJO, K. OGASAWARA, W.L. CHANG, K. TSUDA
    1992 Volume 18 Issue 2 Pages 66-72
    Published: March 15, 1992
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.18.66
    JOURNAL FREE ACCESS
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    Immersion tests of unsaturated polyester resin and FRP were conducted in various alcohols. The corrosion of the resin belonged to the “penetration type, ” in which the resin corrosion was initiated after the penetration of alcohol through into resin was finished. Initial degrada-tion of the resin was controlled by a physical action, followed by a slow chemical degradation, i.e. corrosion. Higher temperature and higher concentration of the solutions promoted the degradation. Lower molecular alcohols produced more severe corrosion by the transesterifica-tion under the neutral condition without a catalyzes of acid or base. Reduction in flexural strength of the resin could be predicted by the volume swollen ratio of the resin. In the case of FRP, the physical degradation was decreased by the filler, and high effectiveness of the FRP for the actual use was shown. However, importance of the effect of corrosion for a long term use was also pointed out.
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  • Transverse Tensile Property and Its Variability of Unidirectional Carbon Fiber Reinforced Composites
    Z. MAEKAWA, H. HAMADA, K. LEE, S. ISHIBASHI
    1992 Volume 18 Issue 2 Pages 73-82
    Published: March 15, 1992
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.18.73
    JOURNAL FREE ACCESS
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    A study was conducted to evaluate reliability of the transverse tensile properties of unidirec-tional CFRP laminates. Four kinds of CFRP were tested in order to examine the factors of variability on mechanical properties and to obtain the information for reliability improve-ment. Temperature dependence of the strength was investigated by means of testing at three different temperatures. Statistical distributions of the respective mechanical properties were obtained from the tensile tests with large sample size. As a conclusion, toughening of the matrix resin resulted in an increase of the strength and considerable decrease of the scatter of the transverse tensile properties of unidirectional CFRP laminates.
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  • [title in Japanese]
    Kazuro KAGEYAMA
    1992 Volume 18 Issue 2 Pages 83-89
    Published: March 15, 1992
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.18.83
    JOURNAL FREE ACCESS
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