TY - JOUR
T1 - Influence of repetitions of the high-pressure hydrogen gas exposure on the internal damage quantity of high-density polyethylene evaluated by transmitted light digital image
AU - Ono, Hiroaki
AU - Fujiwara, Hirotada
AU - Onoue, Kiyoaki
AU - Nishimura, Shin
N1 - Funding Information:
This paper is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO), 2013–2018. We are also grateful to Ms. Miho Ono and Ms. Keiko Ohyama who operated high-pressure hydrogen exposure test machine and conducted density measurement and WAXD measurement for this paper.
Publisher Copyright:
© 2019 Hydrogen Energy Publications LLC
PY - 2019/8/30
Y1 - 2019/8/30
N2 - A quantitative evaluation of the bulk damage level after high-pressure hydrogen exposure for the hydrogen compatible polymeric materials are developed. The bulk damage level of the internal damage induced by high-density polyethylene (HDPE) after 90 MPa hydrogen exposure repetition were evaluated. Based on the light scattering by the internal damage, we established a quantitative damage index in terms of the light transmittance as brightness (B) of transmitted light digital image of the HDPE disk specimen; the relative extinction ratio of transmitted light intensity (βr) as the brightness change ratio. βr was obtained for each pixel of the image for whole specimen. According to the results of the specimen, βr around the central region of specimen was higher than that of the edge region. Averaged βr around the center of specimen (βr¯) logarithmically increased with the increase in exposure number (Nex). Judging from the results, the internal damage tends to generate at the center of specimen, and the internal damage amount increased with increase in Nex.
AB - A quantitative evaluation of the bulk damage level after high-pressure hydrogen exposure for the hydrogen compatible polymeric materials are developed. The bulk damage level of the internal damage induced by high-density polyethylene (HDPE) after 90 MPa hydrogen exposure repetition were evaluated. Based on the light scattering by the internal damage, we established a quantitative damage index in terms of the light transmittance as brightness (B) of transmitted light digital image of the HDPE disk specimen; the relative extinction ratio of transmitted light intensity (βr) as the brightness change ratio. βr was obtained for each pixel of the image for whole specimen. According to the results of the specimen, βr around the central region of specimen was higher than that of the edge region. Averaged βr around the center of specimen (βr¯) logarithmically increased with the increase in exposure number (Nex). Judging from the results, the internal damage tends to generate at the center of specimen, and the internal damage amount increased with increase in Nex.
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U2 - 10.1016/j.ijhydene.2019.07.035
DO - 10.1016/j.ijhydene.2019.07.035
M3 - Article
AN - SCOPUS:85069879783
SN - 0360-3199
VL - 44
SP - 23303
EP - 23319
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 41
ER -
