Reference stress-based J Estimation of circumferential through-wall cracked elbow with unequal thickness under bending

Kyung Dong Bae, Chul Goo Kim, Zalikha Murni, Seung Jae Kim, Yun Jae Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationMaterials and Fabrication
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791846032
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes
EventASME 2014 Pressure Vessels and Piping Conference, PVP 2014 - Anaheim, United States
Duration: 2014 Jul 202014 Jul 24

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume6A
ISSN (Print)0277-027X

Conference

ConferenceASME 2014 Pressure Vessels and Piping Conference, PVP 2014
CountryUnited States
CityAnaheim
Period14/7/2014/7/24

ASJC Scopus subject areas

  • Mechanical Engineering

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  • Cite this

    Bae, K. D., Kim, C. G., Murni, Z., Kim, S. J., & Kim, Y. J. (2014). Reference stress-based J Estimation of circumferential through-wall cracked elbow with unequal thickness under bending. In Materials and Fabrication (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 6A). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2014-28405