TY - JOUR
T1 - Influence of vulcanizing agents and hydrogen exposure on static crack growth properties and threshold tearing energy of EPDM for O-ring
AU - Yamabe, Junichiro
AU - Nishimura, Shin
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2009/11
Y1 - 2009/11
N2 - 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.
AB - 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.
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U2 - 10.1299/kikaia.75.1531
DO - 10.1299/kikaia.75.1531
M3 - Article
AN - SCOPUS:76349105307
VL - 75
SP - 1531
EP - 1541
JO - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
JF - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
SN - 0387-5008
IS - 759
ER -