Browse > Article
http://dx.doi.org/10.3795/KSME-A.2012.36.9.1059

Estimation of Tensile Properties of Pipe Bends Manufactured by Cold-Bending  

Kim, Jin-Weon (Dept. of Nuclear Engineering, Chosun Univ.)
Lee, Mi-Yeon (Dept. of Nuclear Engineering, Chosun Univ.)
Lee, Sa-Yong (Dept. of Nuclear Engineering, Chosun Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.36, no.9, 2012 , pp. 1059-1064 More about this Journal
Abstract
In this study, tensile tests were performed on specimens that simulated the cold-bending and heat-treatment of pipe bends to understand the mechanical properties of pipe bends manufactured by cold-bending followed by heat-treatment for relieving residual stress. The strength and ductility of cold-worked materials were respectively found to be higher and lower than those of the parent material although heat-treatment was carried out to relieve residual stress. In addition, the increase in strength and decrease in ductility were proportional to the applied strain levels for cold-working. It was thus inferred that the intrados and extrados regions of pipe bends that were cold-bended and heat-treated show higher strength and lower ductility compared to the parent straight pipe and that the mechanical properties at the crown region are nearly the same as those of the parent straight pipe.
Keywords
Pipe Bends; Cold Bending; Tensile Property; Feeder Pipe; Heat-treatment;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Jang, Y.S., Kim, S.H., Chang, H.S., Lee, S.M., Choi, J.B., Kim, Y.J. and Choi, Y.H., 2008, "Fluid Effects on Structural Integrity of Pipes with an Orifice and Elbows with a Wall-Thinned Part," J. of Loss Prev. in the Proc. Industries, pp. 1-6.
2 Chexal, B., Horowitz, J,. Dooley, B., Millett P., Wood, C. and Jones, R., 1998, "Flow-Accelerated Corrosion in Power Plant," EPRI/TR-106611-R2.
3 Yetisir, M, Donaberger, R. and Rogge, R., 2006, "Residual Stresses in CANDU Feeder Bends - Effect of Bend Radius," Proc. of PVP2006-ICPVT-11, PVP2006-ICPVT-11-93407.
4 Takahasi, K., Watanabe, S. ando, K., Urabe, Y., Hasatune, M., Miyazaki, K., 2009, "Low Cycle Fatigue Behaviors of Elbows Subjected to Seismic Loading," Nucl. Eng. & Design, Vol. 239, pp. 2719-2727.   DOI   ScienceOn
5 Diter, G.E., 1988, Mechanical Metallugy, SI Metric Ed., McGraw-Hill
6 Duan, X., Kozluk, M.J., Gendron, T. and Slade, J., 2011, "Alternative Methodology for Assessing Part-Through-Wall Cracks in Carbon Steel Bends Removed From Point Lepreau Generating Station," Nucl. Eng. & Design, Vol. 241, pp. 630-637.   DOI   ScienceOn
7 KEPRI, 2005, "Development of Enhanced Performance Technology for PHWR Plant Operation- Development of Prediction and Control Technology for Aging of Feeder Piping, Final Report (GOVP1200510837)
8 KHNP, 2002, "Development of Technologies to Monitor for Feeder Thinning of CANDU Nuclear Power Plants," Final Report (99NS10)