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http://dx.doi.org/10.3795/KSME-A.2007.31.5.586

Plastic Limit Loads of 90° Elbows with Local Wall Thinning using Small Strain FE Limit Analyses (I) - Internal Pressure -  

An, Joong-Hyok (고려대학교 기계공학과)
Kim, Jong-Hyun (고려대학교 기계공학과)
Hong, Seok-Pyo (고려대학교 기계공학과)
Park, Chi-Yong (한전 전력연구원 원자력 연구실)
Kim, Yun-Jae (고려대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.5, 2007 , pp. 586-593 More about this Journal
Abstract
This paper proposes closed-form plastic limit load solutions for elbow with local wall thinning at extrados under internal pressure. This work was performed using 3-dimensional, small strain FE analyses based on elastic-perfectly plastic materials. The wide range of elbow and local wall thinning geometries are considered. For systematic analyses for effect of axial thinning extent on limit loads, two limiting cases are considered; a sufficiently long thinning, and the circumferential part-through surface crack. Then, the closed-form plastic limit load solutions for intermediate thinning are obtained by using result of two limiting cases. The effect of axial thinning extent for elbow on plastic limit load is highlighted by comparing with that for straight pipes. Although the proposed limit load solutions are developed for the case when local wall thinning exist in the center of elbow, it is also shown that they can be applied to the case when local wall thinning exists anywhere within elbow.
Keywords
FE Analysis; Local Wall Thinning; Elbow; Plastic Limit Load; Internal Pressure;
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1 ABAQUS Version 6.2-1. User's manual. Hibbitt, Karlsson and Sorensen, Inc, RI; 2001
2 Yahiaoui, K., Moffat, D.G. and Moreton, D.N., 2000, 'Piping Elbows with Cracks - a Parametric Study of the Influence of Crack Size in Limit Loads Due to Pressure and Opening Bending,' Journal of Strain Analysis, Vol. 35, pp. 35-46   DOI   ScienceOn
3 Shim, D.J., Choi, J.B., and Kim, Y.J., 2004, 'Failure Strength Assessment of Pipes with Local Wall Thinning Under Combined Loading Based on Finite Element Analyses,' ASME Journal of Pressure Vessel Technology, Vol. 126, pp. 179-183   DOI   ScienceOn
4 Kim, Y.J., Oh, C.K., Park, C.Y., and Hasegawa, K., 2006, 'Net-section Limit Load Approach for Failure Strength Estimates of Pipes with Local Wall Thinning,' International Journal of Pressure Vessels and Piping, Vol. 83, pp. 546-555   DOI   ScienceOn
5 Roberston, A., Li, H. and Mackenzie, D., 2005, 'Plastic Collapse of Elbows Under Combined Internal Pressure and In-Plane Bending,' International Journal of Pressure Vessels and Piping, Vol. 82, pp. 407-416   DOI   ScienceOn
6 Hasegawa, K., Sakata, K., Miyazaki, K. and Kanno S., 2002, 'Fatigue Strength for Pipes with Allowable Flaws and Design Curve,' International Journal of Pressure Vessels and Piping, Vol. 79, pp. 37-44   DOI   ScienceOn
7 Ahn, S.H., Nam, K.W., Yoo, Y.S., Ando, K., Ji, S.H., Ishiwata, M. and Hasegawa, K., 2002, 'Fracture Behavior of Straight Pipe and Elbow with Local Wall Thinning,' Nuclear Engineering and Design, Vol. 211, pp. 91-103   DOI   ScienceOn
8 Stephens, D.R. and Lei, B.N., 2000, 'Development of an Alternative Criterion for Residual Strength of Corrosion Defects in Moderate-to High-Toughness Pipe,' Proc. Int. Pipeline Conf., Vol. 2, pp. 781-792
9 Miyazaki, K., Kanno, S., Ishiwata, M., Hasegawa, K., Ahn, S.H. and Ando, K., 2002, 'Fracture and General Yield for Carbon Steel Pipes with Local Wall Thinning,' Nuclear Engineering and Design, Vol. 211, pp. 61-68   DOI   ScienceOn
10 API, API RP579 - Recommended Practice for Fitness-For-Service, 2000, American Petroleum Institute
11 Choi, J.B., Goo, B.K., Kim, J.C., Kim, Y.J. and Kim, W.S., 2003, 'Development of Limit Load Solutions for Corroded Gas Pipelines,' International Journal of Pressure Vessels and Piping, Vol. 80, pp. 121-128   DOI   ScienceOn
12 Kanninen, M.F., Zahoor, A., Wilkoski, G., Abousayed, I., Marschall, C., Broek, D., Sampath, S., Rhee, H. and Ahmad, J., 1982, 'Instability Predictions for Circumferentially Cracked Type-304 Stainless Pipes Under Dynamic Loading,' EPRI NP-2347, Electric Power Research Institute, Palo Alto, CA
13 ASME Boiler and Pressure Vessel Code Section IX (1992)
14 Kim, Y.J. and Oh, C.S., 'Effects of Attached Straight Pipes on Finite Element Limit Analysis of Pipe Bends,' International Journal of Pressure Vessels and Piping (electronic version available)   DOI   ScienceOn
15 Oh, C.K., Kim, Y.J. and Park, C.Y., 'Quantification of Axial Length Effects on Net-Section Limit Loads for Pipes with Local Wall Thinning Under Combined Pressure and Bending,' International Journal of Pressure Vessels and Piping (submitted)
16 Miller, A.G., 1988, 'Review of Limit Loads of Structures Containing Defects,' International Journal of Pressure Vessels and Piping, Vol. 32, pp. 191-327   DOI   ScienceOn
17 Calladine, C.R., 1974, 'Limit Analysis of Curved Tubes,' Journal of Mechanical Engineering Science, Vol. 16, pp. 85-87   DOI
18 Goodall, I.W., 1978, 'Lower Bound Limit Analysis of Curved Tubes Loaded by Combined Internal Pressure and In-Plane Bending Moment,' CEGB report RD/B/N4360 Central Electricity Generating Board
19 Kim, Y.J. and Oh, C.S., 2006, 'Closed Form Plastic Collapse Loads of Elbows Under Combined Pressure and In-Plane Bending,' Engineering Fracture Mechanics, Vol. 73, pp. 1437-1454   DOI   ScienceOn