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Journal of Pressure Vessel Technology | Volume 131 | Issue 2 | Research Paper
Research Papers: Design and Analysis

The Effect of the Distance From the Center of a Weld to the Fixed End on the Residual Stress and Stress Intensity Factor of a Piping Weld

[+] Author and Article Information
Katsumasa Miyazaki

Materials Research Laboratory, Hitachi, Ltd., Hitachi, Ibaraki 317-8511, Japan

Masanori Numata

Consulting Engineering Department, Hitachi Engineering Co., Ltd., Hitachi, Ibaraki 317-0073, Japan

Koichi Saito

Hitachi Works, Hitachi, Ltd., Hitachi, Ibaraki 317-8511, Japan

Masahito Mochizuki

Department of Manufacturing Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan

J. Pressure Vessel Technol 131(2), 021205 (Dec 30, 2008) (9 pages) doi:10.1115/1.3007428 History: Received April 16, 2007; Revised July 22, 2008; Published December 30, 2008
Article
References
Figures
Citing Articles

The fixed conditions of butt welds between straight pipe and the valves or pump in an actual piping system are different from those of straight pipes. However, the effect of the fixed condition on the residual stress and the stress intensity factor for the evaluation of the structural integrity of cracked piping is not clear. In this study, finite element analyses were conducted by considering the differences in the distance from the center of weld to the fixed end L, to clarify the effect of the fixed condition on the residual stress and the stress intensity factor. For 600A piping, the residual stress distribution was not affected by L. Furthermore, the stress intensity factors of circumferential cracks under the residual stress field can be estimated by using an existing simplified solution for piping.
Copyright © 2009 by American Society of Mechanical Engineers
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References

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Okamura, Y., Sakashita, A., Fukuda, T., Yamashita, H., and Futami, T., 2003, “Latest SCC Issues of Core Shroud and Recirculation Piping in Japanese Bwrs,” Transactions of the 17th International Conference on Structural Mechanics in Reactor Technology (SMiRT17), Paper No. WG01-1.
2
Kumagai, K., Suzuki, S., Mizutani, J., Shitara, C., Yonekura, K., Masuda, M., and Futami, T., 2004, “Evaluation of IGSCC Growth Behavior of 316NG PLR Piping in BWR,” PVP (Am. Soc. Mech. Eng.), 479 , pp. 217–223.
3
The American Society of Mechanical Engineers, 2004, ASME Boiler & Pressure Vessel Code Sec. XI, Rules for Inservice Inspection of Nuclear Power Plant Components.
4
Shiratori, M., Miyoshi, T., and Tanikawa, K., 1985, “Analysis of Stress Intensity Factors for Surface Cracks Subjected to Arbitrarily Distributed Surface Stresses,” JSME Int. J., Ser. A, 51 (467), pp. 1828–1835.
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Shiratori, M., Miyoshi, T., Yu, Q., and Mastumoto, T., 2000, “Development of the Database of the Stress Intensity Factors for Nozzle Corner Cracks,” PVP (Am. Soc. Mech. Eng.), 400 , pp. 279–289.
6
Miyazaki, K., Mochizuki, M., Kanno, S., Hayashi, M., Shiratori, M., and Yu, Q., 2002, “Analysis of Stress Intensity Factor Due to Surface Crack Propagation in Residual Stress Fields Caused by Welding—Comparison of Influence Function Method and Inherent Strain Analysis,” JSME Int. J., Ser. A  [CrossRef], 45 (2), pp. 199–207.
7
American Petroleum Institute Recommended Practice 579, 2000 “Fitness for Service,” 1st ed., API Publishing Services, Washington, DC.
8
Katsuyama, J., Mochizuki, M., Higuchi, R., and Toyoda, M., 2005, “Parametric FEM Evaluation of Residual Stress by Circumferential Welding for Austenitic Stainless Steel,” "Proceedings of the 2005 ASME Pressure Vessels and Piping Division Conference", PVP2005-71440.
9
Mochizuki, M., Enomoto, K., Okamoto, N., Saito, H., and Hayashi, E., 1993, “Welding Residual Stresses at the Intersection of a Small Diameter Pipe Penetrating a Thick Plate,” Nucl. Eng. Des.  [CrossRef], 144 (3), pp. 439–447.
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Dong, P., and Hong, J. K., 2001, “Stress Intensity Factor Solutions for Welded Joints Subjected to Weld Residual Stresses,” PVP (Am. Soc. Mech. Eng.), 427 , pp. 71–83.
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Dong, P., and Hong, J. K., 2002, “Consistent Treatment of Weld Residual Stresses in Facture Assessment,” PVP (Am. Soc. Mech. Eng.), 434 , pp. 89–99.
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Dong, P., and Rawls, G., 2003, “Crack Growth Behaviors in a Residual Stress Field for Vessel Type Structures,” PVP (Am. Soc. Mech. Eng.), 464 , pp. 43–48.
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Dong, P., 2004, “On the Mechanics of Residual Stresses in Girth Welds,” PVP (Am. Soc. Mech. Eng.), 479 , pp. 119–12.

Figures

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+Schematic of the piping system
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Schematic of the piping system
Figure 1

Schematic of the piping system

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+Geometry of the piping model with distance from weld center to the fixed end L: (a) piping model; (b) detail in A, configuration of weld
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Geometry of the piping model with distance from weld center to the fixed end L: (a) piping model; (b) detail in A, configuration of weld
Figure 2

Geometry of the piping model with distance from weld center to the fixed end L: (a) piping model; (b) detail in A, configuration of weld

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+Residual stress distributions with L=2.5(Rt)0.5: (a) axial stress and (b) hoop stress
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Residual stress distributions with L=2.5(Rt)0.5: (a) axial stress and (b) hoop stress
Figure 3

Residual stress distributions with L=2.5(Rt)0.5: (a) axial stress and (b) hoop stress

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+Residual stress distributions with L=0.2(Rt)0.5: (a) axial stress and (b) hoop stress
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Residual stress distributions with L=0.2(Rt)0.5: (a) axial stress and (b) hoop stress
Figure 4

Residual stress distributions with L=0.2(Rt)0.5: (a) axial stress and (b) hoop stress

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+Axial residual stress distributions at the fixed end: (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5
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Axial residual stress distributions at the fixed end: (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5
Figure 5

Axial residual stress distributions at the fixed end: (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5

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+Hoop residual stress distributions at the fixed end: (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5
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Hoop residual stress distributions at the fixed end: (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5
Figure 6

Hoop residual stress distributions at the fixed end: (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5

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+Comparison of axial residual stress distributions at the fixed end and free end (distance from the center of weld, z=5.0mm): (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5
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Comparison of axial residual stress distributions at the fixed end and free end (distance from the center of weld, z=5.0mm): (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5
Figure 7

Comparison of axial residual stress distributions at the fixed end and free end (distance from the center of weld, z=5.0mm): (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5

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+Comparison of hoop residual stress distributions at the fixed end and free end (distance from the center of weld, z=5.0mm): (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5
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Comparison of hoop residual stress distributions at the fixed end and free end (distance from the center of weld, z=5.0mm): (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5
Figure 8

Comparison of hoop residual stress distributions at the fixed end and free end (distance from the center of weld, z=5.0mm): (a) distance from the center of weld to fixed end, L=2.5(Rt)0.5; (b) distance from the center of weld to fixed end, L=0.2(Rt)0.5

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+Effect of distance from the center of weld to the fixed end, L on the axial residual stress distribution: (a) distance from the center of weld, z=0.0mm (the center of weld); (b) distance from the center of weld, z=3.0mm; (c) distance from the center of weld, z=5.0mm; (d) distance from the center of weld, z=10.0mm
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Effect of distance from the center of weld to the fixed end, L on the axial residual stress distribution: (a) distance from the center of weld, z=0.0mm (the center of weld); (b) distance from the center of weld, z=3.0mm; (c) distance from the center of weld, z=5.0mm; (d) distance from the center of weld, z=10.0mm
Figure 9

Effect of distance from the center of weld to the fixed end, L on the axial residual stress distribution: (a) distance from the center of weld, z=0.0mm (the center of weld); (b) distance from the center of weld, z=3.0mm; (c) distance from the center of weld, z=5.0mm; (d) distance from the center of weld, z=10.0mm

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+Effect of distance from the center of weld to the fixed end, L on the hoop residual stress distribution: (a) distance from the center of weld, z=0.0mm (the center of weld); (b) distance from the center of weld, z=3.0mm; (c) distance from the center of weld, z=5.0mm; (d) distance from the center of weld, z=10.0mm
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Effect of distance from the center of weld to the fixed end, L on the hoop residual stress distribution: (a) distance from the center of weld, z=0.0mm (the center of weld); (b) distance from the center of weld, z=3.0mm; (c) distance from the center of weld, z=5.0mm; (d) distance from the center of weld, z=10.0mm
Figure 10

Effect of distance from the center of weld to the fixed end, L on the hoop residual stress distribution: (a) distance from the center of weld, z=0.0mm (the center of weld); (b) distance from the center of weld, z=3.0mm; (c) distance from the center of weld, z=5.0mm; (d) distance from the center of weld, z=10.0mm

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+Procedure for estimation of stress intensity factors
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Procedure for estimation of stress intensity factors
Figure 11

Procedure for estimation of stress intensity factors

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+Mesh division of the finite element model for estimation of stress intensity factors by the nodal release method (a∕t=0.2): (a) mesh division of finite element model of piping; (b) detail in A; (c) detail in B
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Mesh division of the finite element model for estimation of stress intensity factors by the nodal release method (a∕t=0.2): (a) mesh division of finite element model of piping; (b) detail in A; (c) detail in B
Figure 12

Mesh division of the finite element model for estimation of stress intensity factors by the nodal release method (a∕t=0.2): (a) mesh division of finite element model of piping; (b) detail in A; (c) detail in B

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+Approximation of axial residual stress distribution for estimation of stress intensity factors by the simplified method (L=0.2(Rt)0.5, z=5.0mm, side of fixed end)
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Approximation of axial residual stress distribution for estimation of stress intensity factors by the simplified method (L=0.2(Rt)0.5, z=5.0mm, side of fixed end)
Figure 13

Approximation of axial residual stress distribution for estimation of stress intensity factors by the simplified method (L=0.2(Rt)0.5, z=5.0mm, side of fixed end)

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+Changes in stress intensity factor due to crack propagation estimated by the nodal release method with FEA and the simplified method (L=0.2(Rt)0.5)
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Changes in stress intensity factor due to crack propagation estimated by the nodal release method with FEA and the simplified method (L=0.2(Rt)0.5)
Figure 16

Changes in stress intensity factor due to crack propagation estimated by the nodal release method with FEA and the simplified method (L=0.2(Rt)0.5)

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+Redistributions of axial residual stress due to the crack propagation (L=0.2(Rt)0.5, z=5.0mm, fixed end)
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Redistributions of axial residual stress due to the crack propagation (L=0.2(Rt)0.5, z=5.0mm, fixed end)
Figure 15

Redistributions of axial residual stress due to the crack propagation (L=0.2(Rt)0.5, z=5.0mm, fixed end)

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+Example of changes in axial residual stress distribution (a∕t=0.2): (a) after welding; (b) after initiation of crack, a∕t=0.2
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Example of changes in axial residual stress distribution (a∕t=0.2): (a) after welding; (b) after initiation of crack, a∕t=0.2
Figure 14

Example of changes in axial residual stress distribution (a∕t=0.2): (a) after welding; (b) after initiation of crack, a∕t=0.2

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