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 17, Issue 5
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    Yoshikazu SHINOHARA, Ichiro SHIOTA, Ryuzo WATANABE
    1991 Volume 17 Issue 5 Pages 179-185
    Published: September 15, 1991
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.17.179
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Mikio MORITA
    1991 Volume 17 Issue 5 Pages 186-192
    Published: September 15, 1991
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.17.186
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Kazuo YAGI
    1991 Volume 17 Issue 5 Pages 192-198
    Published: September 15, 1991
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.17.192
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Seiichi KATO
    1991 Volume 17 Issue 5 Pages 198-204
    Published: September 15, 1991
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.17.198
    JOURNAL FREE ACCESS
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  • Influence of Fiber Diameter on Microstructure and Failure Mechanisms of Short Fiber Reinforced Poly(ethylene terephthalate)
    N.S. CHOI, K. TAKAHASHI
    1991 Volume 17 Issue 5 Pages 205-212
    Published: September 15, 1991
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.17.205
    JOURNAL FREE ACCESS
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    Uniaxial tensile deformation and fracture behavior of injection-molded, short-glass-fiberreinforced poly (ethylene terephthalate) were investigated with special attention to the effects of fiber diameters (d=6, 10, 16, 23.μm). Influence of fiber surface treatment was also studied. Fiber aspect ratio and fiber number density were measured. Those values exhibited a decrease in average with an increase of fiber diameter. Sizing and silane treatment of fibers resulted in a slight increase of average aspect ratio when compared with a case of etching treatment. A microscopic failure morphology observation during loading to the maximum stress level showed shear banding around fiber ends, debonding and voiding at fiber ends and fiber breakage. Values of the minimum fiber length lmin were presented for fibers of different diameters. Below lmin, failure was hardly observed. In a process of load increase, failure sites joined together in a few local regions to generate catastrophic fracture. The failure processes were similar in specimens with fibers of different d, irrespective of the fiber treatment. Furthermore, critical aspect ratio was measured with average length of broken fibers to estimate the fibermatrix interfacial shear strength.
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  • Influence of Fiber Diameter on Strengthening Mechanisms of Short Fiber Reinforced Poly(ethylene terephthalate)
    N.S. CHOI, K. TAKAHASHI
    1991 Volume 17 Issue 5 Pages 213-218
    Published: September 15, 1991
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.17.213
    JOURNAL FREE ACCESS
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    Strengthening mechanisms of injection-molded, short-glass-fiber-reinforced polyethylene terephthalate) under uniaxial tension were studied with particular attention to the effect of fiber diameter (d=6, 10, 16, 23μm). Effects of fiber surface treatment were also investigated. Young's modulus was well described by the Cox model considering the fiber aspect ratio and the normalized center-to-center distance between fibers. Tensile strength was quantitatively analyzed on a presently modified version of Kelly's model. The version took into account the strength increase with increasing fiber lateral surface area as well as the strength decrease caused by failure occurrence. It was found that the version accounted for the obtained strength data rather well. Furthermore it was shown that failure strain and total strain energy were partly affected by the fiber lateral surface area. In conclusion, fiber aspect ratio, normalized center-to-center distance between fibers and fiber lateral surface area were significantly influenced by the change in fiber diameters and fiber surface treatment during injection molding. These values, rather than the fiber diameter itself, considerably affected strengthening mechanisms in short fiber reinforced thermoplastics.
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 17 Issue 5 Pages 221
    Published: September 15, 1991
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.17.221
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 17 Issue 5 Pages 221a
    Published: September 15, 1991
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.17.221a
    JOURNAL FREE ACCESS
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