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 1
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    2005 Volume 31 Issue 1 Pages 1-4
    Published: January 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    2005 Volume 31 Issue 1 Pages 5
    Published: January 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.5
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Kazuro KAGEYAMA
    2005 Volume 31 Issue 1 Pages 6-12
    Published: January 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.6
    JOURNAL FREE ACCESS
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  • Mechanical Property and Structure of Injection Expanded Molding of GF Reinforced PP
    Manabu NOMURA, Kaoru WADA, Hiroyuki HAMADA
    2005 Volume 31 Issue 1 Pages 13-20
    Published: January 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.13
    JOURNAL FREE ACCESS
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    Glass fiber reinforced plastics are used as important industrial materials. Generally the role of GF is a reinforcement of plastics.But recently new concept is suggested that the GF itself to be a structural element. The injection expanded molding is an example.It combines spring-back force of long fiber and core-back technology at injection mold to get the light and rigidity structure.In this paper mechanical properties and the structure of the injection expanded mold of GFPP are investigated.The structure of expanded mold consists of an unexpended layer of surface and an expanded layer inside.This expanded mold has higher rigidity than rib structure with high impact strength.The new method that fiber is used for the structure element of mold is confirmed to be useful.
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  • CAI Strength of MR50K/PETI5 Carbon/Tough-Polyimide Composite Material
    Hisaya KATOH, Toshiyuki SHIMOKAWA, Akira UEDA, Yasumasa HAMAGUCHI, Dai ...
    2005 Volume 31 Issue 1 Pages 21-30
    Published: January 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.21
    JOURNAL FREE ACCESS
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    In this study CAI (Compression After Impact) strength of a carbon/tough-polyimide composite material, MR50K/PETI5, where PETI5 resin was newly developed for the next generation SST at NASA was investigated. First, impact damage was given to CAI specimens at room temperature and the load response was measured during the impact test and the damage of the specimens was observed by an ultra sonic C-scanner and 3-D ultrasonic inspection system. Second, CAI strength and failure strain at room and high temperatures were measured. Third, the damage caused by the CAI test was observed using an optical microscope. Test results are compared with those of T800H/PMR-15 carbon/polyimide composite, where PMR-15 is a typical brittle resin, and the characteristic CAI behavior and strength of a carbon fiber/highly-tough resin composite was clarified.
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  • Matrix Crack Accumulation Behavior in Multiple Plies of CFRP Laminates
    Tomohiro YOKOZEKI, Takahira AOKI, Takashi ISHIKAWA
    2005 Volume 31 Issue 1 Pages 31-37
    Published: January 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.31
    JOURNAL FREE ACCESS
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    Matrix cracking behavior in multiple plies of composite laminates was experimentally investigated using [0/θ2/90]s CFRP laminates with θ=30, 45 and 60. Detailed accumulation process of matrix cracks in each ply was observed within the static tension test program by X-ray transmission and CT scanning techniques. In the case of [0/602/90] s specimens, numerous 60-ply micro cracks were induced by 90-ply crack initiation, while 30-ply cracks in [0/302/90] s specimens appeared as cracks propagating in the fiber direction. In addition, the micro cracks in 60-ply rarely extended in the fiber direction even at high strain levels. Finally, discussions on the formation of micro cracks in θ-ply were provided in terms of energy release rates associated with θ-ply crack propagation including the influence of 90-ply cracks.
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  • A Layerwise Optimization Approach Combined with FEM for Optimizing Laminated Composite Plates
    Yoshihiro NARITA
    2005 Volume 31 Issue 1 Pages 38-44
    Published: January 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.38
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    A concept of a layerwise optimization (LO) approach, previously proposed by the author, is extended to be combined with the finite element method (FEM) and this combined approach for structural optimization, named LO-FEM approach, is demonstrated to obtain the optimum performance of symmetrically laminated composite plates. Design variables are taken to be the fiber orientation angles in all K layers. This usually causes a rapid increase in computation time due to the search for optimum solutions in the K dimensional space. The LO makes it possible, however, that this multi-dimensional optimization problem reduces into only K times repetition of onedimensional search. In the FEM formulation, the stiffness matrix is modified to be suited for the LO procedure. The numerical examples show that the LO-FEM approach is a quite effective tool to obtain the minimum deflection in the bending problem and the maximum frequency in the vibration problem.
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  • [title in Japanese]
    Hiroshi SUEMASU
    2005 Volume 31 Issue 1 Pages 45-46
    Published: January 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.45
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  • [title in Japanese]
    Hiroyuki HAMADA
    2005 Volume 31 Issue 1 Pages 46-48
    Published: January 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.46
    JOURNAL FREE ACCESS
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