A Visualizing Study of Blister Fracture in Rubber O-rings

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  • KOGA Atsushi
    NOK CORPORATION
  • YAMABE Tadahisa
    NOK CORPORATION
  • SATO Hiroyuki
    NOK CORPORATION
  • UCHIDA Kenichi
    NOK CORPORATION
  • NAKAYAMA Junichi
    NOK CORPORATION
  • YAMABE Junichiro
    International Research Center for Hydrogen Energy, Kyushu University The Research Center for Hydrogen Industrial Use and Storage, National Institute of Advanced Industrial Science and Technology
  • NISHIMURA Shin
    Department of Mechanical Engineering, Faculty of Engineering, Kyushu University The Research Center for Hydrogen Industrial Use and Storage, National Institute of Advanced Industrial Science and Technology

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Other Title
  • ゴムOリングのブリスタ破壊の可視化評価
  • ゴム Oリング ノ ブリスタ ハカイ ノ カシカ ヒョウカ

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Abstract

In order to establish a hydrogen energy system, the reliability of sealing rubber for high-pressure hydrogen has been required. The rubber O-ring for hydrogen energy system is used with pressurized-decompress cycle of high-pressure hydrogen. It causes internal cracks referred as blister fracture. Degradation of seal performance originated from blister fracture is one of the important issues to improve the reliability. This study focused on the blister initiation behavior and the effect of materials, gas species and decompression rate on blister fracture in terms of visualizing O-ring behavior under high-pressure gas. For the visualizing evaluation, a transparent ethylene-propylene rubber (EPDM) and vinyl-methyl silicone rubber (VMQ) O-rings were molded, and a special viewable high-pressure vessel with a glass viewport was developed. The O-ring specimens were exposed to high-pressure hydrogen, helium, and nitrogen at 10 MPa until gas solubility content in O-ring was saturated; afterwards, these gases were decompressed with some rate. It was obviously visualized that the blister fracture did not occur in VMQ O-ring but occurred in EPDM. The blister fracture of the EPDM O-ring in nitrogen was the most serious in the tested gases. These blister behaviors are considered to be related to gas diffusivity of hydrogen, helium and nitrogen.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 85 (5), 162-167, 2012

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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