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 29, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    Hisaichi OHNABE
    2003 Volume 29 Issue 3 Pages 81-89
    Published: May 15, 2003
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.29.81
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Yoshinori TAKAHASHI
    2003 Volume 29 Issue 3 Pages 90-97
    Published: May 15, 2003
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.29.90
    JOURNAL FREE ACCESS
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  • Stacking Sequence Optimizations for Composite Laminates with Fractal Branch and Bound Method
    Application for Supersonic Panel Flutter Problem with Buckling Load Condition
    Yoshiyasu HIRANO, Akira TODOROKI
    2003 Volume 29 Issue 3 Pages 98-105
    Published: May 15, 2003
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.29.98
    JOURNAL FREE ACCESS
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    Fractal branch and bound method has developed by the authors for the optimization of stacking sequences to maximize buckling load of composite structures. The method demands an approximation of a design space with a response surface comprising quadratic polynomials for pruning fractal branches of stacking sequences. The approximation of the objective function with quadratic polynomials has been confirmed for the buckling load maximizations and flutter speed limit maximizations using lamination parameters as predictors. In the present study, flutter speed maximization with a constraint of buckling load is employed as an example of stacking sequence optimizations by means of the fractal branch and bound method with a strength constraint. The present paper shows the theoretical background of the fractal branch and bound method, and approximations using quadratic polynomials with lamination parameters as predictors are performed. After that, the effectiveness of the method for the supersonic panel flutter of composite laminates is investigated using two cases. As a result, the method is successfully applied, and the practical optimal stacking sequence is obtained using modified response surfaces.
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  • Dynamic Stability Analysis of Angle-Ply Laminated Cylindrical Shells Subjected to Impact Hydrostatic Pressure
    Hirakazu KASUYA, Yasuji YAMAGISHI
    2003 Volume 29 Issue 3 Pages 106-112
    Published: May 15, 2003
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.29.106
    JOURNAL FREE ACCESS
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    This paper deals with the problem of dynamic stability of angle-ply laminated cylindrical shells subjected to impact hydrostatic pressure is described. First of all, the motion of cylindrical shells subjected to impact hydrostatic pressure is defined as an axially symmetric motion. Following this definition, certain perturbations are superimposed on this motion and their effect on the behavior of the shell is investigated. The symmetric state of the motion of the shell is called stable if the perturbations remained bounded. The solutions for the prebuckling motion and the perturbed motion are obtained using the Galerkin's method. Stable regions are determined by utilizing the Mathieu's equation. The inevitability of dynamically unstable behavior is proved analytically and the effects of various factors, such as hydrostatic pressure ratio, lamination angle and dynamic unstable mode, are clarified.
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  • Analysis of the Effect of the Configuration of the Delamination Crack on Delamination Monitoring with Electric Resistance Change Method
    Akira TODOROKI, Miho TANAKA, Yoshinobu SHIMAMURA, Hideo KOBAYASHI
    2003 Volume 29 Issue 3 Pages 113-119
    Published: May 15, 2003
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.29.113
    JOURNAL FREE ACCESS
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    Since delaminations of composite laminates are usually invisible or difficult to be detected by visual inspections, the delamination causes low reliability of primary structures. In order to improve the low reliability, automatic systems for delamination identifications in-service are desired. The present study employs an electric resistance change method for detections of the delaminations. Although the method is effective to monitor the delamination cracks, the method requires many experiments to solve inverse problems. Since the experiment cost is high, an analytical method for preparation of the data sets of the electric resistance changes is desired. In practical delamination, however, usually includes a matrix cracking. In the present study, therefore, the effect of the matrix cracking on the electric resistance changes between the electrodes is investigated with FEM analyses. As a result, it can be concluded that the simple calculations using a straight delamination crack model are enough for obtaining the data set of electric resistance changes to calculate the response surfaces.
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  • [title in Japanese]
    [in Japanese]
    2003 Volume 29 Issue 3 Pages 121
    Published: May 15, 2003
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.29.121
    JOURNAL FREE ACCESS
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