Plastic loads of elbows with local wall thinning under in-plane bending
Source abstract
Abstract
Based on systematic three-dimensional (3-D), large strain FE limit analyses using elastic- perfectly plastic materials, this paper quantifies the effect of local wall thinning on plastic behavior and TES (twice-elastic-slope) plastic loads for 90° elbows under in-plane bending. The thinning geometry is assumed to be rectangular rather than circular, but the nonlinear geometry effect is fully considered. Results from systematic analyses lead to simple approximations for TES plastic loads, covering a wide range of elbow and thinning geometries. Although the proposed approximations are developed for the case when wall thinning locates in the center of the elbow, it is also shown that they can be equally applied to the case when thinning exists anywhere within the elbow. Brief discussion is made on application of the proposed approximations to estimate maximum load-carrying capacities of elbows with local wall thinning.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Metal Forming Simulation Techniques · Metallurgy and Material Forming · Material Properties and Failure Mechanisms
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (14)
Show source-provided references
1. ABAQUS Version 6.4 (2005) User’s manual. Hibbitt, Karlsson and Sorensen, Inc., RI
2. Ahn S-H, Nam K-W and Yoo Y-S (2002). Fracture behavior of straight pipe and elbow with local wall thinning. Nucl Eng Des 211: 91–10310.1016/S0029-5493(01)00447-2 ↗
3. American Society of Mechanical Engineers (2003) Cases of ASME bolier and pressure vessel code case N-597-2. ASME
4. Chattopadhyay J, Tomar AKS and Dutta BK (2004). Closed-form collapse moment equations of throughwall circumferentially cracked elbows subject to in-plane bending moment. J Press Vess Technol 126: 307–31710.1115/1.1767177 ↗
5. Hasegawa K, Sakata K and Miyazaki K (2002). Fatigue strength for pipes with allowable flaws and design curve. Int J Press Vess Piping 79: 37–4410.1016/S0308-0161(01)00129-6 ↗
6. Kim YJ and Oh CS (2006). Closed form plastic collapse loads of elbows under combined pressure and in-plane bending. Eng Fract Mech 73: 1437–145410.1016/j.engfracmech.2006.02.001 ↗
7. Kim YJ, Oh CK and Park CY (2006). Net-section limit load approach for failure strength estimates of pipes with local wall thinning. Int J Press Vess Piping 83: 546–55510.1016/j.ijpvp.2006.03.001 ↗
8. Kim YJ, Kim YI and Song TK (2007). Finite element plastic loads for circumferential cracked pipe bends under in-plane bending. Eng Fract Mech 74(5): 643–66810.1016/j.engfracmech.2006.07.001 ↗
9. Miyazaki K, Kanno S and Ishiwata M (1999). Fracture behavior of carbon steel pipe with local wall thinning subject to bending load. Nucl Eng Des 191: 195–20410.1016/S0029-5493(99)00141-7 ↗
10. Miyazaki K, Kanno S and Ishiwata M (2002). Fracture and general yield for carbon steel pipes with local wall thinning. Nucl Eng Des 211: 61–6810.1016/S0029-5493(01)00438-1 ↗
11. Roberston A, Li H and Mackenzie D (2005). Plastic collapse of elbows under combined internal pressure and in-plane bending. Int J Press Vess Piping 82: 407–41610.1016/j.ijpvp.2004.09.005 ↗
12. Shim DJ, Choi JB and Kim YJ (2004). Failure strength assessment of pipes with local wall thinning under combined loading based on finite element analyses. ASME J Press Vess Technol 126: 179–18310.1115/1.1687382 ↗
13. Stephens DR, Lei BN (2000) Development of an alternative criterion for residual strength of corrosion defects in moderate-to high-toughness pipe. Paper presented at international pipeline conference, vol 2. pp 781–79210.1115/IPC2000-192 ↗
14. Yahiaoui K, Moffat DG and Moreton DN (2000). Piping elbows with cracks-a parametric study of the influence of crack size on limit loads due to pressure and opening bending. J Strain Anal 35: 35–4610.1243/0309324001513991 ↗