Influence of Vulcanizing Agents and Hydrogen Exposure on Static Crack Growth Properties and Threshold Tearing Energy of EPDM for O-Ring

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  • YAMABE Junichiro
    Department Mechanical Science Engineering, Kyusyu University:HYDROGENIUS, AIST
  • NISHIMURA Shin
    Department Mechanical Science Engineering, Kyusyu University:HYDROGENIUS, AIST

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Other Title
  • Oリング用エチレンプロピレンゴム(EPDM)の静き裂進展特性および下限界引裂きエネルギに及ぼす架橋剤と水素曝露の影響
  • Oリングヨウ エチレンプロピレンゴム EPDM ノ セイ キレツ シンテン トクセイ オヨビ カゲンカイ ヒキサキ エネルギ ニ オヨボス カキョウザイ ト スイソ バクロ ノ エイキョウ

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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 T_<s,th> 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 T_<s,th> 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 T_<s,th> values of NF and NFT.

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