This paper proposes a new failure assessment method for a steel pipe bend subjected to both a bending moment and internal pressure. Consistent with previous studies, it was shown that the maximum bending moment of a pipe bend subjected to a bending moment increases with the addition of internal pressure. However, it was experimentally confirmed that the addition of this internal pressure has the detrimental effect of significantly reducing the critical deformation (maximum bending angle) of the pipe bend. In addition, it was found that, subsequent to the application of a large deflection, cracks initiate at the most deformed part of the pipe bend during the process of unloading the internal pressure and then the applied load. Herein, the authors propose a practical failure assessment method which uses small-scale tests and nonlinear finite element (FE) analyses to predict the critical deformation and crack initiation position for a full-scale pipe bend. The failure criterion, which uses principal stress, mean stress, and equivalent plastic strain, was developed using small-scale tests. A failure assessment was conducted by comparing the predictions of this criterion with stress and strain histories obtained from FE analyses. Also, the authors’ failure criterion was compared with previous failure criteria, and the advantages/disadvantages discussed.
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A Failure Assessment Method for a Pipe Bend Subjected to Both a Bending Moment and Internal Pressure
Masaki Yoshikawa
m-yoshikawa@jfe-rd.co.jp
,
Masaki Yoshikawa
JFE R&D Corporation
, 1-1, Minamiwatarida, Kawasaki-ku, Kawasaki, 210-0855 Japan
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Akihiko Katoh
a-kato@jfe-rd.co.jp
,
Akihiko Katoh
JFE R&D Corporation
, 1-1, Minamiwatarida, Kawasaki-ku, Kawasaki, 210-0855 Japan
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Kazuaki Sasaki
Kazuaki Sasaki
Professor
Faculty and Graduate School of Engineering,
kazki@eng.hokudai.ac.jp
Hokkaido University
, Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628 Japan
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Masaki Yoshikawa
JFE R&D Corporation
, 1-1, Minamiwatarida, Kawasaki-ku, Kawasaki, 210-0855 Japanm-yoshikawa@jfe-rd.co.jp
Akihiko Katoh
Kazuaki Sasaki
Professor
Faculty and Graduate School of Engineering,
Hokkaido University
, Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628 Japankazki@eng.hokudai.ac.jp
J. Pressure Vessel Technol. Nov 2006, 128(4): 605-617 (13 pages)
Published Online: December 1, 2005
Article history
Received:
June 12, 2005
Revised:
December 1, 2005
Citation
Yoshikawa, M., Katoh, A., and Sasaki, K. (December 1, 2005). "A Failure Assessment Method for a Pipe Bend Subjected to Both a Bending Moment and Internal Pressure." ASME. J. Pressure Vessel Technol. November 2006; 128(4): 605–617. https://doi.org/10.1115/1.2349574
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