Influence of vulcanizing agents and hydrogen exposure on static crack growth properties and threshold tearing energy of EPDM for O-ring

Junichiro Yamabe, Shin Nishimura

    研究成果: ジャーナルへの寄稿学術誌査読

    5 被引用数 (Scopus)

    抄録

    Hydrogen pressure at blister initiation of a peroxide-crosslinked EPDM composite (NFT) was successfully estimated in terms of fracture mechanics in the previous study. In that estimation, threshold tearing energy of a static crack Tth in air room temperature was employed as the resistance of the blister initiation. In this study, static crack growth tests of a sulfur-crosslinked EPDM composite (NF) were conducted using single edge crack specimens in air and in 0.7MPa hydrogen gas at room temperature ; then the influence of the type of vulcanizing agents (peroxide and sulfur) and hydrogen exposure on static crack growth properties and threshold tearing energy was investigated. From the observation of static crack growth by optical and secondary electron microscopes, NF had a rougher fracture surface than NFT ; consequently, the static crack rate of NF was slower than that of NFT at the same tearing energy. The Tth value of NF was also about three times higher than that of NFT. Hydrogen did not influence the tendency of the da/dt-T curves and Tth values of NF and NFT.

    本文言語英語
    ページ(範囲)1531-1541
    ページ数11
    ジャーナルNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
    75
    759
    DOI
    出版ステータス出版済み - 11月 2009

    !!!All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 材料力学
    • 機械工学

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