Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 7, Issue 3
Displaying 1-2 of 2 articles from this issue
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  • Development of CFRP Turbocharger Impeller
    Tomaru Ogawa, Koichi Handa, Tamaki Asakawa, Katsuyuki Yamamoto
    1995 Volume 7 Issue 3 Pages 163-167
    Published: March 20, 1995
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.7.163
    JOURNAL FREE ACCESS
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  • The Influence of Annealing on Fatigue Strength in Polyethylene
    Koichi KITAO
    1995 Volume 7 Issue 3 Pages 190-195
    Published: March 20, 1995
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.7.190
    JOURNAL FREE ACCESS
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    To investigate the influence of morphology on fatigue strength of polyethylene, the change in fatigue strength and relaxation behavior by annealing was evaluated using high-density polyethylene, which has few short branches, and medium-density polyethylene, which has many short branches. For medium-density polyethylene, which showed higher fatigue strength, he annealing had a small effect on β relaxation behavior and the fatigue strength was increased by annealing at 110°C. Alternately, for high-density polyethylene which showed lower fatigue strength, annealing decreased the fatigue strength and enlarged the intensity of β relaxation. It was thought that the fatigue strength of high-density polyethylene was dependent on entanglement by fine crystals and that the disappearance of that by annealing yielded lower fatigue strength and the enlargement of β relaxation intensity.
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