During normal operating conditions, piping systems in nuclear power plants are subject to internal pressure and bending loads induced by deadweight, thermal expansion, and internal pressure. Thus, understanding the effect of bending load on the failure of wall-thinned elbows is important to understand failure behavior and to evaluate the failure pressure reliably. This study includes a series of burst tests using full-scale 4-in. schedule 80 elbow specimens with local wall-thinning under combined internal pressure and in-plane bending load. The results are compared with those tested under simple internal pressure only. In the tests, various circumferential thinning angles (, 0.25, 0.5, 1.0) and thinning locations (intrados, extrados, and full-circumference) were considered. Each specimen was initially subjected to a displacement controlled in-plane bending load, closing mode for extrados wall-thinned elbows, and opening mode for intrados wall-thinned elbows, and then internal pressure was applied up to the point of final failure. The results showed that the effect of in-plane bending on the failure pressure and failure mode was minor under all wall-thinning conditions. In addition, the dependence of failure pressure on the circumferential thinning angle and thinning locations was identical to that observed under simple internal pressure.
Skip Nav Destination
e-mail: jwkim@chosun.ac.kr
Article navigation
June 2009
Research Papers
Experimental Evaluation of the Bending Load Effect on the Failure Pressure of Wall-Thinned Elbows
Jin-Weon Kim,
Jin-Weon Kim
Associate Professor
Department of Nuclear Engineering,
e-mail: jwkim@chosun.ac.kr
Chosun University
, 375 Seosuk-dong, Dong-gu, Gwangju 501-759, Republic of Korea
Search for other works by this author on:
Yeon-Soo Na,
Yeon-Soo Na
Kyungpoog National University Hospital
, 200 Dongduk-ro, Jung-gu, Daegu 700-721, Republic of Korea
Search for other works by this author on:
Sung-Ho Lee
Sung-Ho Lee
Nuclear Power Laboratory,
Korea Electric Power Research Institute
, 103-16 Munji-dong, Yusung-gu, Daejon 305-380, Republic of Korea
Search for other works by this author on:
Jin-Weon Kim
Associate Professor
Department of Nuclear Engineering,
Chosun University
, 375 Seosuk-dong, Dong-gu, Gwangju 501-759, Republic of Koreae-mail: jwkim@chosun.ac.kr
Yeon-Soo Na
Kyungpoog National University Hospital
, 200 Dongduk-ro, Jung-gu, Daegu 700-721, Republic of Korea
Sung-Ho Lee
Nuclear Power Laboratory,
Korea Electric Power Research Institute
, 103-16 Munji-dong, Yusung-gu, Daejon 305-380, Republic of KoreaJ. Pressure Vessel Technol. Jun 2009, 131(3): 031210 (8 pages)
Published Online: April 29, 2009
Article history
Received:
May 5, 2008
Revised:
January 5, 2009
Published:
April 29, 2009
Citation
Kim, J., Na, Y., and Lee, S. (April 29, 2009). "Experimental Evaluation of the Bending Load Effect on the Failure Pressure of Wall-Thinned Elbows." ASME. J. Pressure Vessel Technol. June 2009; 131(3): 031210. https://doi.org/10.1115/1.3122032
Download citation file:
Get Email Alerts
Measurement of Steam-Generator-Tube Vibration Damping Caused by Anti-Vibration-Bar Supports
J. Pressure Vessel Technol (February 2025)
Related Articles
Dynamic Analysis of Fracture in Thin-Walled Pipes
J. Pressure Vessel Technol (December,2011)
Buckling of Barreled Shells Subjected to External Hydrostatic Pressure
J. Pressure Vessel Technol (May,2001)
A Failure Assessment Method for a Pipe Bend Subjected to Both a Bending Moment and Internal Pressure
J. Pressure Vessel Technol (November,2006)
Failure Strength Assessment of Pipes With Local Wall Thinning Under Combined Loading Based on Finite Element Analyses
J. Pressure Vessel Technol (May,2004)
Related Proceedings Papers
Related Chapters
Part 2, Section II—Materials and Specifications
Companion Guide to the ASME Boiler & Pressure Vessel Code, Volume 1, Second Edition
Part 2, Section II—Materials and Specifications
Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 1, Third Edition
Introduction
Fluid Mechanics, Water Hammer, Dynamic Stresses, and Piping Design