Estimation of hydrogen pressure at blister initiation of EPDM composite exposed to high pressure hydrogen gas

Junichiro Yamabe, Shin Nishimura

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6 Citations (Scopus)

Abstract

Transparent EPDM composite crosslinked by peroxide with no fillers was exposed to hydrogen gas at a maximum pressure of 10 MPa, and then the behavior of blister initiation and growth in the composite after decompression was observed by an optical microscope. The critical pressure where no blisters initiated PH.cr was 1-2 MPa, while micrometer-sized blisters initiated in the composite at PH > 1-2 MPa. It is considered that these blisters initiated due to stress concentration of micrometer-sized bubbles under an inner pressure Π formed by supersaturated hydrogen molecules after decompression ; then the energy release rate-tearing energy, T-of these bubbles was calculated theoretically or by FEM. Parallel to the calculation, static crack growth tests were conducted, and the threshold tearing energy for the static crack Ts.th was experimentally obtained. From the criterion expressed by T> Ts.th, the inner pressure at blister initiation πF was estimated and then was compared with PH.cr. Consequently, πF≈PH.CT, i.e., the critical pressure where no blisters initiated was successfully estimated in terms of fracture mechanics.

Original languageEnglish
Pages (from-to)633-643
Number of pages11
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume75
Issue number753
DOIs
Publication statusPublished - May 2009
Externally publishedYes

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Hydrogen
Gases
Composite materials
Energy release rate
Peroxides
Fracture mechanics
Fillers
Stress concentration
Crack propagation
Microscopes
Cracks
Finite element method
Molecules

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Estimation of hydrogen pressure at blister initiation of EPDM composite exposed to high pressure hydrogen gas",
abstract = "Transparent EPDM composite crosslinked by peroxide with no fillers was exposed to hydrogen gas at a maximum pressure of 10 MPa, and then the behavior of blister initiation and growth in the composite after decompression was observed by an optical microscope. The critical pressure where no blisters initiated PH.cr was 1-2 MPa, while micrometer-sized blisters initiated in the composite at PH > 1-2 MPa. It is considered that these blisters initiated due to stress concentration of micrometer-sized bubbles under an inner pressure Π formed by supersaturated hydrogen molecules after decompression ; then the energy release rate-tearing energy, T-of these bubbles was calculated theoretically or by FEM. Parallel to the calculation, static crack growth tests were conducted, and the threshold tearing energy for the static crack Ts.th was experimentally obtained. From the criterion expressed by T> Ts.th, the inner pressure at blister initiation πF was estimated and then was compared with PH.cr. Consequently, πF≈PH.CT, i.e., the critical pressure where no blisters initiated was successfully estimated in terms of fracture mechanics.",
author = "Junichiro Yamabe and Shin Nishimura",
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doi = "10.1299/kikaia.75.633",
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journal = "Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A",
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T1 - Estimation of hydrogen pressure at blister initiation of EPDM composite exposed to high pressure hydrogen gas

AU - Yamabe, Junichiro

AU - Nishimura, Shin

PY - 2009/5

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N2 - Transparent EPDM composite crosslinked by peroxide with no fillers was exposed to hydrogen gas at a maximum pressure of 10 MPa, and then the behavior of blister initiation and growth in the composite after decompression was observed by an optical microscope. The critical pressure where no blisters initiated PH.cr was 1-2 MPa, while micrometer-sized blisters initiated in the composite at PH > 1-2 MPa. It is considered that these blisters initiated due to stress concentration of micrometer-sized bubbles under an inner pressure Π formed by supersaturated hydrogen molecules after decompression ; then the energy release rate-tearing energy, T-of these bubbles was calculated theoretically or by FEM. Parallel to the calculation, static crack growth tests were conducted, and the threshold tearing energy for the static crack Ts.th was experimentally obtained. From the criterion expressed by T> Ts.th, the inner pressure at blister initiation πF was estimated and then was compared with PH.cr. Consequently, πF≈PH.CT, i.e., the critical pressure where no blisters initiated was successfully estimated in terms of fracture mechanics.

AB - Transparent EPDM composite crosslinked by peroxide with no fillers was exposed to hydrogen gas at a maximum pressure of 10 MPa, and then the behavior of blister initiation and growth in the composite after decompression was observed by an optical microscope. The critical pressure where no blisters initiated PH.cr was 1-2 MPa, while micrometer-sized blisters initiated in the composite at PH > 1-2 MPa. It is considered that these blisters initiated due to stress concentration of micrometer-sized bubbles under an inner pressure Π formed by supersaturated hydrogen molecules after decompression ; then the energy release rate-tearing energy, T-of these bubbles was calculated theoretically or by FEM. Parallel to the calculation, static crack growth tests were conducted, and the threshold tearing energy for the static crack Ts.th was experimentally obtained. From the criterion expressed by T> Ts.th, the inner pressure at blister initiation πF was estimated and then was compared with PH.cr. Consequently, πF≈PH.CT, i.e., the critical pressure where no blisters initiated was successfully estimated in terms of fracture mechanics.

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