It is important to assess the failure strengths for pipes with wall thinning to maintain the integrity of the piping systems and to make codification of allowable wall thinning. Full-scale fracture experiments on cyclic loading under constant internal pressure were performed for diameter straight pipes and diameter elbow pipes at ambient temperature. The experiments were low cycle fatigue under displacement controlled conditions. It is shown that a dominant failure mode under cyclic loading for straight pipes and elbows is crack initiation∕growth accompanying swelling by ratchet or buckling with crack initiation. When the thinning depth is deep, the failure mode is burst and crack growth with ratchet swelling. In addition, failure strengths were compared with the design fatigue curve of the ASME Code Sec. III. It is shown that pipes with wall thinning less than 50% of wall thickness have sufficient margins against a seismic event of the safety shutdown earthquake.
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e-mail: hasegawa-kunio@jnes.go.jp
e-mail: katsumasa.miyazaki.xs@hitachi.com
e-mail: izumi@bosai.go.jp
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February 2008
Research Papers
Failure Mode and Failure Strengths for Wall Thinning Straight Pipes and Elbows Subjected to Seismic Loading
Kunio Hasegawa,
Kunio Hasegawa
Nuclear System Division,
e-mail: hasegawa-kunio@jnes.go.jp
Hitachi, Ltd.
, Saiwai-cho 3-1-1, Hitachi-shi, 317-8511 Ibaraki-ken, Japan
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Katsumasa Miyazaki,
Katsumasa Miyazaki
Hitachi Research Laboratory,
e-mail: katsumasa.miyazaki.xs@hitachi.com
Hitachi, Ltd.
, Saiwai-cho 3-1-1, Hitachi-shi, 317-8511 Ibaraki-ken, Japan
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Izumi Nakamura
e-mail: izumi@bosai.go.jp
Izumi Nakamura
National Research Institute for Earth Science and Disaster Prevention
, Miki-shi, Hyogo-ken 673-0515, Japan
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Kunio Hasegawa
Nuclear System Division,
Hitachi, Ltd.
, Saiwai-cho 3-1-1, Hitachi-shi, 317-8511 Ibaraki-ken, Japane-mail: hasegawa-kunio@jnes.go.jp
Katsumasa Miyazaki
Hitachi Research Laboratory,
Hitachi, Ltd.
, Saiwai-cho 3-1-1, Hitachi-shi, 317-8511 Ibaraki-ken, Japane-mail: katsumasa.miyazaki.xs@hitachi.com
Izumi Nakamura
National Research Institute for Earth Science and Disaster Prevention
, Miki-shi, Hyogo-ken 673-0515, Japane-mail: izumi@bosai.go.jp
J. Pressure Vessel Technol. Feb 2008, 130(1): 011404 (8 pages)
Published Online: January 17, 2008
Article history
Received:
February 9, 2006
Revised:
January 8, 2007
Published:
January 17, 2008
Citation
Hasegawa, K., Miyazaki, K., and Nakamura, I. (January 17, 2008). "Failure Mode and Failure Strengths for Wall Thinning Straight Pipes and Elbows Subjected to Seismic Loading." ASME. J. Pressure Vessel Technol. February 2008; 130(1): 011404. https://doi.org/10.1115/1.2826425
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