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 31, Issue 6
Displaying 1-5 of 5 articles from this issue
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  • [title in Japanese]
    Tomohiro YOKOZEKI, Takahira AOKI
    2005 Volume 31 Issue 6 Pages 241-250
    Published: November 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.241
    JOURNAL FREE ACCESS
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  • Preliminary Study on Adhesive Strength of CFRP Patched Aluminum Alloy Plate Immersed in Salt Water
    Akira KUDO, Kazumasa MORIYA, Yoshihisa SUZUKI
    2005 Volume 31 Issue 6 Pages 251-257
    Published: November 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.251
    JOURNAL FREE ACCESS
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    CFRP composite patches have been widely used to repair damaged structural components of metallic aircrafts. Though CFRP is well-known as a corrosion-resistant material, once the carbon fibers of CFRP are in direct contact with aluminum alloy, the galvanic interaction between CFRP and aluminum induces the corrosion of aluminum alloy resulting decrease of the joint strength. In this study, tensile specimens made of two pieces of aluminum alloy plates joined with a single-lap cocured patch of unidirectional CFRP prepreg were immersed in salt water for 49 days maximum. For some of the specimens, silicon sealant was applied around the edge of the joint for waterproofing. Every 7 days of immersion, changes in electric potential and in electric resistance were measured followed by the tensile testing. After 49 days of immersion, the joint strength of sealed specimen was found to be more than four times higher than that of unsealed one. The relationship of the joint strength with the change in electric potential and that with the change in electric resistance were obtained. The joint strength was successfully estimated by the change in electric potential and electric resistance.
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  • Stacking-sequence Optimizations Using Fractal Branch and Bound Method with Modified Response Surface
    An Investigation of Approximating Method for Design Space of High-order Coupling Flutter Problem
    Yoshiyasu HIRANO, Akira TODOROKI
    2005 Volume 31 Issue 6 Pages 258-267
    Published: November 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.258
    JOURNAL FREE ACCESS
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    The fractal branch and bound method has been developed by the authors for optimization of stacking sequences to maximize buckling load of composite structures. The method demands approximation of a design space with a response surface comprising quadratic polynomials for pruning fractal branches of stacking sequences. The approximation of the design space with quadratic polynomials has been confirmed for the buckling load maximization and flutter speed limit maximization using lamination parameters as predictors. In the present study, flutter speed maximization for clamped panel flutter problem is employed as an example of stacking sequence optimization by means of the fractal branch and bound method for the flutter problem, which has complicated design space due to coupling of high-order vibration modes of flutter. The theoretical background of the Fractal branch and bound method, and the modified response surface method with newly proposed the adjusted coefficient of evaluation Eadj2 (E-square-adjusted) for complicated design-spaced problem is proposed; approximation using quadratic polynomials with lamination parameters as predictors. After that, the effectiveness of the method for the supersonic clamped panel flutters of composite laminates is investigated. As a result, the method is successfully applied, and the practical optimal stacking sequence is obtained using modified response surfaces.
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  • Mechanical Properties of Corrugated Carbon Fiber Plain Woven Fabrics for Flexible Wing Material
    Tomohiro YOKOZEKI, Shinichi TAKEDA, Toshio OGASAWARA, Takashi ISHIKAWA
    2005 Volume 31 Issue 6 Pages 268-273
    Published: November 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.268
    JOURNAL FREE ACCESS
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    Corrugated-form composites manufactured from carbon fiber plain woven fabrics are expected to show ultra-anisotropic characteristics, which means very flexible in the corrugation direction and stiff in the direction perpendicular to the corrugation. In this study, mechanical properties of the corrugated composites were investigated as a candidate material of flexible structural components, e.g. morphing wings. In-plane stiffness and strength of the corrugated composites were evaluated through the tensile and bending tests in both in-plane longitudinal and transverse directions to the corrugation. Experimental results indicated that corrugated fabrics have ultra-high longitudinal/transverse stiffness ratio under tensile and bending loadings. Finally, a simple analytical model for the initial stiffness of the corrugated woven fabrics was developed, and the validity of the predic-tions was verified compared with the experimental results.
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  • Erratum to : DSC Analyses of Absorbed Water in Polyamide 6- and Epoxy-Carbon Fiber Model Composites
    2005 Volume 31 Issue 6 Pages 275
    Published: 2005
    Released on J-STAGE: February 08, 2010
    DOIhttps://doi.org/10.6089/jscm.31.275
    JOURNAL FREE ACCESS
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