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 21, Issue 5
Displaying 1-5 of 5 articles from this issue
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  • [title in Japanese]
    Tohru OGAWA, Yoshinori TESHIMA, Yoshinori WATANABE
    1995 Volume 21 Issue 5 Pages 165-173
    Published: September 15, 1995
    Released on J-STAGE: February 08, 2010
    DOIhttps://doi.org/10.6089/jscm.21.165
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Hikaru IIO
    1995 Volume 21 Issue 5 Pages 174-180
    Published: September 15, 1995
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.21.174
    JOURNAL FREE ACCESS
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  • Moldability of Long Glass Fiber Mat Reinforced Polypropylene Resin Sheet to a Cupped Part
    Junsuke FUJIWARA, Shinsaku HANASAKI, Shuji TOUYAMA, Yoshio HASEGAWA
    1995 Volume 21 Issue 5 Pages 181-188
    Published: September 15, 1995
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.21.181
    JOURNAL FREE ACCESS
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    Long glass fiber mat reinforced polypropylene resin sheet is one type of stampable sheets. The stampable sheet is easily formed into a part, but it has some problems in the processing. So, in this report, the effects of molding conditions on the moldability were investigated. That is to say, the effect of the heating temperature, the heating time, the mold temperature and the charge pattern on the strength and the surface roughness were investigated in details, when the cupped parts were molded. The main results obtained are as follows: 1) The most suitable heating conditions of the stampable sheet blank are 230°C and 5 min. 2) The part made from 4 pieces of ply has the highest strength. 3) In the case of the mold temperature below 100°C, the higher the mold temperature is, the better the surface rouhness of part is. 4) The part under the mold temperature 150°C had the highest strength.
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  • Moldability of Long Glass Fiber Mat Reinforced Polypropylene Resin Sheet to a Rectangular Plate Part
    Junsuke FUJIWARA, Shinsaku HANASAKI, Kaoru WATANABE, Iton CHOU
    1995 Volume 21 Issue 5 Pages 189-196
    Published: September 15, 1995
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.21.189
    JOURNAL FREE ACCESS
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    Long glass fiber mat reinforced polypropylene resin sheet is one type of stampable sheets. The mechanical properties of stampable sheet molded part are affected by molding conditions, namely, heating temperature, mold temperature, number of ply. According to the previous report, the strength of a molded cupped part is the highest in the case of 4 plies. So in this report, in order to clarify the effect of the molding conditions on the mechanical strength, rectangular plate parts were molded under the various molding conditions. The main results obtained are as follows; 1) The bending strength of the inner position in the rectangular plate increases slightly with the increase of the heating temperature, but it lowers in the case of 270°C. 2) The tensile strength is the highest in the case of the mold temperature of 100°C. 3) The bending and the tensile strength increase with the increase of ply number until 4 pieces of ply. They are constant or slightly decrease in case of 5 and 6 pieces of ply. 4) The strength of the outer position is higher than that of inner position because of the fiber orientation.
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  • A Singular Analysis for the Corner Point of Square Inclusion and Square Hole by Finite Element Method
    Katuyuki TANAKA, Haruo ISHIKAWA
    1995 Volume 21 Issue 5 Pages 197-204
    Published: September 15, 1995
    Released on J-STAGE: August 11, 2009
    DOIhttps://doi.org/10.6089/jscm.21.197
    JOURNAL FREE ACCESS
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    In order to investigate the effect of element size in finite element calculation on the numerical result of the singularity order of elastic stress, the problem of a rectangular plate including a square inclusion or square hole, the corner point of which has two kinds of stress singularity, are numeri cally analyzed under tensile loading. It was found that for obtaining the singularity order that gives higher severity from the numerical result of stress, very fine size of element mesh of the order of 1:10-9 for the relative size to specimen near the corner point is necessary. There is a possibility that the singularity order obtained from the numerical result of displacement is more accurate compared with the value from the result of stress.
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