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 3
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Koichi GODA
    2005 Volume 31 Issue 3 Pages 95-101
    Published: May 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.95
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Takashi ISHIKAWA, Yasuhiro YAMAGUCHI, Minoru NODA
    2005 Volume 31 Issue 3 Pages 101a-111
    Published: May 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.101a
    JOURNAL FREE ACCESS
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  • Damage Process of [90/0]s GFRP Cross-ply Laminates
    Junji NDDA, Tomonaga OKABE, Nobuo TAKEDA, Masao SHIMIZU
    2005 Volume 31 Issue 3 Pages 112-119
    Published: May 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.112
    JOURNAL FREE ACCESS
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    We investigated the damage process of GFRP cross-ply laminates which have outer-ply 90° plies (e.g. [90/0]s). While [0/90]s laminates form symmetric cracks, staggered cracks occur in [90/0]s laminates. To simulate the failure process of [90/0]s laminates, we proposed a numerical model based on the finite element method. In this model, we used cohesive elements to simulate the occurrence and the propagation of ply cracks and delaminations. We found that simulated results agreed well with the experimental data. We confirmed the validity of the numerical model for the damage process of [90/0]s laminates.
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  • Improved Flexural Impact Properties of Carbon Fiber/Epoxy Golf Shaft Hybridized with Pitch-based Low Modulus Carbon Fiber
    Shinichi TAKEMURA, Haruyoshi MIZUTA, Albert S. KOBAYASHI
    2005 Volume 31 Issue 3 Pages 120-127
    Published: May 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.120
    JOURNAL FREE ACCESS
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    Pitch-based low modulus carbon fiber increases the flexural impact properties of PAN-based carbon fiber/epoxy composites when it is used as an outer reinforcing layer. This is due to its larger compressive failure strain, which delays the fiber microbuckling failure of the PAN-based fiber layer on the compression side. In this paper, low modulus fiber was applied to the tip segment of a golf shaft as an outer reinforcing layer to provide higher impact performance. In a model circular composite tube for a golf shaft, a PAN-based fiber layer with a fiber modulus of 300 GPa was reinforced with a low modulus outer layer having a fiber modulus of 55 GPa. A flexural impact test showed that the low modulus fiber increased the flexural impact strength and the energy absorption of the composite tube. A finite element analysis based on damage mechanics indicated that the compressive strength of the PAN-based fiber layer increased from 1, 570 MPa in a monolithic unidirectional laminate to 2, 450 MPa in the hybrid tube. This analytical result suggests that the hydrostatic stress state around the loading point restrained the microbuckling failure of the PAN-based fiber layer and increased its compressive strength.
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  • Analysis of Transverse Lamina Cracks in a Multi-Directionally (0°, ±45°, 90°and 90°Oriented) Reinforced Laminates and a Damage Tolerance Design of Composite Plates
    Kazuro KAGEYAMA, Satoshi ABE, Kazuo HIEKATA
    2005 Volume 31 Issue 3 Pages 128-136
    Published: May 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.128
    JOURNAL FREE ACCESS
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    Analytical approach to transverse lamina cracking of ply-groups in a multi-axially (0°, ±45°and 90°oriented) laminated composite material has been proposed in the present paper. Quasi three-dimensional stress and strain analysis of a ply-group with the through-the-width transverse lamina cracks was carried out by using finite differential total force method, assuming periodical arrangement of cracks along the longitudinal direction. Equivalent elastic moduli and Mode I and II energy release rates of the damaged ply group are evaluated. Effects of crack density, in-plane elastic moduli, ply-group thickness and fiber orientation on the equivalent elastic moduli and energy release rate are expressed as interpolation functions, which are applicable to general multi-axial composite laminates. Simple calculation procedure has been proposed for damage tolerance design of laminated composite structures.
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  • [title in Japanese]
    Naoyuki TAJIMA, Tateo SAKURAI, Nobuo TAKEDA, Kanehiro NAGAI, Junichi K ...
    2005 Volume 31 Issue 3 Pages 137-141
    Published: May 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.137
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  • [title in Japanese]
    Hiroshi YAMADA
    2005 Volume 31 Issue 3 Pages 141-144
    Published: May 15, 2005
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.31.141
    JOURNAL FREE ACCESS
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