Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 5, Issue 1
Displaying 1-3 of 3 articles from this issue
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  • ‘Bionolle’ Biodegradable Plastics, Aliphatic Thermoplastic Polyesters
    Takashi Fujimaki, Noriaki Harigaya
    1993 Volume 5 Issue 1 Pages 36-41
    Published: January 20, 1993
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.5.36
    JOURNAL FREE ACCESS
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  • Numerical Analysis for Neck Propagation of Plastic Films (2)
    Load-displacement Curve on Nonuniform Deformation Behavior
    Chisato NONOMURA, Toshitake SUZUKI, Hideaki ISHIHARA
    1993 Volume 5 Issue 1 Pages 60-65
    Published: January 20, 1993
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.5.60
    JOURNAL FREE ACCESS
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    The analysis of large deformation behaviors for polymers is regarded as one of the most important subjects in the fields of film and fiber processing.
    We studied unique load-displacement behavior in neck formation and neck propagation of polymers, that is decrease of load just after the yield point, by use of finite element method (FEM). Especially, the relationship between the decrease of load and elastic-plastic constitutive law was investigated in detail.
    The following results were obtained;
    (1) The decrease of load just after the yield point could be reproduced in the results of numerical analysis.
    (2) Unloading occurs in the unnecked part simultaneously with neck formation, and the decrease of load after the yield point is originated by this unloading.
    (3) The decrease of load after the yield point, the increase of cross section at unloading part, and the magnitude of neck depend on the size of plastic deformation region before steep rise of tangent modulus.
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  • On the Effects of Fillers upon the Tribological Properties of Polyamideimide
    Isamu SEKIGUCHI, Yukisaburo YAMAGUCHI
    1993 Volume 5 Issue 1 Pages 66-71
    Published: January 20, 1993
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.5.66
    JOURNAL FREE ACCESS
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    In this study, the effects of addition of fillers and heat treatment upon the tribological properties of polyamideimide (PAI) were evaluated.
    Four kinds of fillers, potassium titanate whisker (PTW), processed mineral fiber (PMF), iron phosphate (FeP2) and asbestos fiber, were used. PAI composites were molded by compression molding at 420°C and 10MPa for 50min.
    In order to experimentally investigate the effects of heat treatment, moldings were heat treated under condition of three steps, 1st step at 160°C for 24h, 2nd step at 245°C for 24h and 3rd step at 260°C for 24h. The wear rates of PAI composites are smaller than that of unfilled PAI. The limiting pv values of heat treated PAI injection molded is greater than that of the untreated one.
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