In large plant facilities, elbow and straight pipe have large potion in whole piping system. When the cracks are initiated in pipe, the cracks have to be evaluated using fracture mechanics parameter such as J-integral. Unlike calculating J-integral of straight pipes, estimation J-integral of elbow using finite element analysis is not easy. Because the effect of geometries for crack behavior of elbow are more complex than straight pipes. Also, there is another difference between elbow and straight pipe. That is unequal thickness in intrados and extrados. Unequal thickness of elbow pipes generally occurs by the manufacturing process. Thickness in intrados is getting thicker than nominal thickness but thickness in extrados is getting thinner than nominal thickness. So first, this paper provides a reference stress-based J-integral estimation of circumferential through-wall cracked elbow with equal thickness. And this paper provides also a reference stress-based J-integral estimation of circumferential through-wall cracked elbow with unequal thickness. To find the reference stress-based approximate J-integral, various ratio of thickness (t), pipe radius (r), pipe bend radius (R) and crack length (θ) are considered. And three-dimensional finite element analyses using elastic property for elastic crack behavior and elastic–perfectly plastic property for limit load are performed. Finally Results in this research are presented in the failure assessment diagram (FAD) space.
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ASME 2014 Pressure Vessels and Piping Conference
July 20–24, 2014
Anaheim, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4603-2
PROCEEDINGS PAPER
Reference Stress-Based J Estimation of Circumferential Through-Wall Cracked Elbow With Unequal Thickness Under Bending
Kyung-Dong Bae,
Kyung-Dong Bae
Korea University, Seoul, Korea
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Zalikha Murni,
Zalikha Murni
Korea University, Seoul, Korea
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Seung-Jae Kim,
Seung-Jae Kim
Korea University, Seoul, Korea
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Yun-Jae Kim
Yun-Jae Kim
Korea University, Seoul, Korea
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Kyung-Dong Bae
Korea University, Seoul, Korea
Chul-Goo Kim
Korea University, Seoul, Korea
Zalikha Murni
Korea University, Seoul, Korea
Seung-Jae Kim
Korea University, Seoul, Korea
Yun-Jae Kim
Korea University, Seoul, Korea
Paper No:
PVP2014-28405, V06AT06A013; 7 pages
Published Online:
November 18, 2014
Citation
Bae, K, Kim, C, Murni, Z, Kim, S, & Kim, Y. "Reference Stress-Based J Estimation of Circumferential Through-Wall Cracked Elbow With Unequal Thickness Under Bending." Proceedings of the ASME 2014 Pressure Vessels and Piping Conference. Volume 6A: Materials and Fabrication. Anaheim, California, USA. July 20–24, 2014. V06AT06A013. ASME. https://doi.org/10.1115/PVP2014-28405
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