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

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルMaterials and Fabrication
出版社American Society of Mechanical Engineers (ASME)
ISBN(電子版)9780791846032
DOI
出版ステータスPublished - 2014
外部発表はい
イベントASME 2014 Pressure Vessels and Piping Conference, PVP 2014 - Anaheim, United States
継続期間: 2014 7月 202014 7月 24

出版物シリーズ

名前American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
6A
ISSN(印刷版)0277-027X

Conference

ConferenceASME 2014 Pressure Vessels and Piping Conference, PVP 2014
国/地域United States
CityAnaheim
Period14/7/2014/7/24

ASJC Scopus subject areas

  • 機械工学

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