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 15, Issue 3
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    Shigeyuki AKIHAMA
    1989 Volume 15 Issue 3 Pages 89-92
    Published: May 15, 1989
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.15.89
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Takuji KOYANAGI
    1989 Volume 15 Issue 3 Pages 93-97
    Published: May 15, 1989
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.15.93
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Kimitaka SATO, Mitsuaki MATSUMOTO, Tokuo YOSHIMURA
    1989 Volume 15 Issue 3 Pages 98-103
    Published: May 15, 1989
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.15.98
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Takatoshi SAGAWA
    1989 Volume 15 Issue 3 Pages 104-108
    Published: May 15, 1989
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.15.104
    JOURNAL FREE ACCESS
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  • Research on In-plane Shear Testing Methods of Advanced Composite Panels
    H. IWAI, M. UEMURA, H. OKUBO
    1989 Volume 15 Issue 3 Pages 109-115
    Published: May 15, 1989
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.15.109
    JOURNAL FREE ACCESS
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    The mechanical in-plane shear testing method for advanced composite panels has not yet been authorized internationally because of its difficulty to present the uniform shear stress field and the reliable shear properties. In the present paper, the several revisions of the traditional picture-frame loading fixture are proposed to use for the in-plane shear testing method. The experiments on unidirectional and cloth-reinforced CFRP specimens and the numerical analyses by the use of FEM were performed in order to verify the advantages of these various revisions. As a result, the uniform pure shear stress state and hence the reliable higher shear strengths were obtained, because there is no large stress concentrations along edges and at corners, compared with other testing methods which used the traditional simple picture-frame fixture, two-rail or three-rail shear fixtures and JIS method. That is, in these shear tests which are used most widely at present, the lower shear strengths were obtained because of the premature failure due to stress concentration and nonuniform stress distribution. Further, it seemed that JIS method for GFRP did not give a shear fracture under combined stress conditions in unidirectional composites.
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  • Effects of the Interfacial Slippage on the Transverse Elastic Moduli of Unidirectional Fiber Composites
    T. HISAYAMA, Y. KON, K. TAKAHASHI
    1989 Volume 15 Issue 3 Pages 116-121
    Published: May 15, 1989
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.15.116
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    The analytical model for the fiber/matrix interfacial slippage, developed in the preceding paper, has been extended to the prediction of the transverse elastic moduli of the unidirectional fiber composite. The isotropic elasticity is assumed for both of the fiber and the matrix, and the theory of plane strain elastic field in the transverse cross-section of the fiber composite is applied. The effective transverse elastic moduli are formulated using the principle of minimum complementary energy. Numerical calculations are conducted for the transverse tensile moduli of a boron/aluminum composite and the theoretical results are compared with the existing experimental data. The analysis developed here can be applied to the prediction of the transverse tensile stress-strain relation, if the yield stress and the stiffness degradation after the yielding are provided for the matrix aluminum.
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  • Effects of Damage on Fatigue Strength of CFRP Laminates
    T. AOKI, T. KUBO, K. KOYAMA, K. KONDO, S. KOBAYASHI
    1989 Volume 15 Issue 3 Pages 122-131
    Published: May 15, 1989
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.15.122
    JOURNAL FREE ACCESS
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    Tension-tension and compression-compression fatigue tests are conducted on cross-ply, angle-ply and quasi-isotropic carbon/epoxy (CFRP) laminates to characterize the damages which affect the fatigue strength. Two types of matrix-dominated damages, the transverse crackings and delaminations, are found to have significant effects on the final strength for the quasiisotropic laminates, while for the cross-ply and the angle-ply laminates, the correlations between these damages and the fatigue strength are not clear. Concise analyses of delamination onset and growth using the energy-release-rate approach are also given for quasi-isotropic laminates. Effects of stacking sequence, loading direction and ply thickness on delamination are clarified. The effective size of inherent free-edge flaws for delamination onset is also examined.
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  • [title in Japanese]
    1989 Volume 15 Issue 3 Pages 133-136
    Published: May 15, 1989
    Released on J-STAGE: February 08, 2010
    DOIhttps://doi.org/10.6089/jscm.15.133
    JOURNAL FREE ACCESS
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