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 23, Issue 5
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    Minoru SUGITA
    1997 Volume 23 Issue 5 Pages 161-166
    Published: September 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.161
    JOURNAL FREE ACCESS
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  • Effects of Surface Treatment Conditions on Mechanical Properties of Glass Beads Filled Epoxy Composites
    Kiyohisa TAKAHASHI, Norihito NIWA, Kenji NAGATA, Kouichi KARUKAYA
    1997 Volume 23 Issue 5 Pages 167-173
    Published: September 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.167
    JOURNAL FREE ACCESS
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    The effect of the surface treatment condition of glass beads by the γ-aminopropyltrimethoxy-silane (APS) on the flexural properties and glass transition temperature (Tg) of the glass beads filled composite was investigated experimentally. Bisphenol A type of epoxy precursor (E828) and the curing agent ethylenediamine (EDA) were used. The flexural modulus, flexural strength and Tg of the composite reached to the maximum values at 1wt% of APS in an aqueous solution and the hydrolysis time of 30 min. Under the identical condition, the APS treated slide glass attained to the highest wettability with distilled water. These phenomena was explained consistently by the use of the crosslink structure model of APS molecules on the glass surface. On the other hand, in order to promote the chemical reaction between APS and E828, an attempt was made to mix the APS treated glass beads with E828 at 150°C before EDA was added. As a results, flexural properties and Tg enhanced remarkably compared to the 80°C mixing.
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  • Effects of Grafted PP Addition on Flexural Properties and Water Absorption Degradation of Glass Beads Filled PP Composites
    Kiyohisa TAKAHASHI, Yoshito HANE, Megumi AOYAMA, Kenji NAGATA
    1997 Volume 23 Issue 5 Pages 174-181
    Published: September 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.174
    JOURNAL FREE ACCESS
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    An attempt was made to improve the interfacial adhesion between glass beads and polypropylene (PP) matrix by the introduction of graft-modified PP. Two types of modified PP's, which were grafted by different amount of maleic anhydride, were used. The grafted PP was added to PP matrix up to 30 wt%, then 30 wt% of glass beads were filled to make the composite specimen. Flexural properties, the water absorption behavior under the immersion in 80°C water, and the degradation of flexural properties of the composites by water absorption were investigated. Results obtained are as follows : (1) Flexural modulus and strength of the composite exhibit maximum values when 5 wt% of the grafted PP is added to PP. (2) When 3 wt% or 5 wt% of the grafted PP is added to PP, the water absorption of the composite decreases and the degradation by the water absorption is suppressed. (3) The grafted PP by less amount of maleic anhydride is more effective to improve the flexural properties.
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  • Measurement of Dynamic Interlaminar Fracture Toughness of FRP Laminates Using Dynamic Displacement Measuring Apparatus
    Mitsugu TODO, Takashige NAKAMURA, Toshio MADA, Kiyoshi TAKAHASHI
    1997 Volume 23 Issue 5 Pages 182-188
    Published: September 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.182
    JOURNAL FREE ACCESS
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    Dynamic mode II and mixed-mode interlaminar fracture toughnesses of CFRP laminates were measured using an instrumented impact testing system at a low impact speed (0.9 m/s). The system consists of a drop weight impact tester and a dynamic displacement measuring apparatus constructed of an optical fiber, a position sensing detector and a laser light source. The results show that if load data obtained from the strain gage installed at the dart is used to estimate the dynamic Interlaminar fracture toughness, it can cause the overestimation of the dynamic toughness and results in an erroneous understanding of the experimental results. It is also shown that the dynamic toughness can be evaluated accurately based on the displacement data measured by the displacement measuring apparatus. It is thus concluded that the displacement-based analysis is more accurate and reliable than the load-based analysis in the measurement of the dynamic interlaminar fracture toughness of FRP laminates.
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  • [title in Japanese]
    Kyohei KONDO
    1997 Volume 23 Issue 5 Pages 189-194
    Published: September 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.189
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 23 Issue 5 Pages 194a
    Published: September 15, 1997
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.23.194a
    JOURNAL FREE ACCESS
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