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

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    5 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)1531-1541
    Number of pages11
    JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
    Volume75
    Issue number759
    DOIs
    Publication statusPublished - Nov 2009

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

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