Journal of the Japan Society for Composite Materials

[title in Japanese]

Shojiro OCHIAI, Masaki HOJO

1995 Volume 21 Issue 2 Pages 37-46
Published: March 15, 1995
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.21.37

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[title in Japanese]

Shintarou KITADE

1995 Volume 21 Issue 2 Pages 46-51
Published: March 15, 1995
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.21.46

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[title in Japanese]

[in Japanese]

1995 Volume 21 Issue 2 Pages 51a
Published: March 15, 1995
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.21.51a

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[title in Japanese]

Kenji FUKUTA

1995 Volume 21 Issue 2 Pages 51b-60
Published: March 15, 1995
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.21.51b

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Micromechanics Study of Tensile Strength Deterioration of Short Glass Fiber Reinforced Thermoplastics by a Slight Amount of Inorganic Addition Agent (Titanium Dioxide)

Katsuhiro YAMADA, Hiroshi SUZUKI, Hideki SEKINE

1995 Volume 21 Issue 2 Pages 61-68
Published: March 15, 1995
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.21.61

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Tensile strength of injection-molded short glass fiber reinforced thermoplastics was remarkably decreased by the addition of a slight amount of titanium dioxide (TiO₂) . Generally it is explained that the strength deterioration is due to much shortening of glass fiber length under processing, since the hardness of TiO₂ is higher than that of glass fibers. In this study, the influence of the addition of TiO₂ (0.2 wt%) to short glass fiber reinforced polyamide 6 on the strength of glass fibers in the composite was investigated. The tensile strength of the composite containing TiO₂ was fairly lower than that of the composite without TiO₂, even if the glass fiber lengths in the composite were unchanged. However, numerous flaws were observed on the surface of glass fibers in the composite containing TiO₂. After tensile test of the composites, the pull-out lengths of glass fibers were measured and the variation of Weibull moduli was estimated by using the data based on the Weibull weakest-link theory. As a result, the value of scale parameter decreased markedly by the addition of TiO₂. Namely, it was found that the main factor of the strength deterioration of short glass fiber reinforced polyamide 6 containing TiO₂ was weakening of glass fibers.

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Fracture Toughness of Glass Particle Filled Polypropylene Composites: Effects of Shape and Surface Treatment of Particles

Koichi KARUKAYA, Kiyohisa TAKAHASHI, Yoshiyasu ANDO

1995 Volume 21 Issue 2 Pages 69-78
Published: March 15, 1995
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.21.69

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Fracture toughness of polypropylene (PP) and its composites reinforced with the glass bead or glass milled fiber was investigated in relations to the shape and the surface treatment of glass particles. Two types of raw materials ; the high crystalline and the general purpose PP's, were used. The glass particles were treated by six kinds of silane coupling agents. The wettability was measured by the contact angle of nine kinds of liquids on to the glass plates treated by the same silane coupling agents. The fracture toughness of composites, measured by the compact tension type test pieces, has shown good correlation with the wettability, i.e., the surface polarity and the critical surface tension.

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[title in Japanese]

[in Japanese]

1995 Volume 21 Issue 2 Pages 81
Published: March 15, 1995
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.21.81

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