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Research Papers: Materials and Fabrication

Effect of Welding Residual Stress on the Buckling Behavior of Storage Tanks Subjected to Harmonic Settlement

[+] Author and Article Information
Jian-Guo Gong

School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: jggong@ecust.edu.cn

Lei Yu

School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: stu_yu@yeah.net

Feng Wang

School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: feng.wang1990@yahoo.com

Fu-Zhen Xuan

School of Mechanical and Power Engineering,
East China University of Science
and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: fzxuan@ecust.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 21, 2015; final manuscript received June 15, 2016; published online August 5, 2016. Assoc. Editor: Xian-Kui Zhu.

J. Pressure Vessel Technol 139(1), 011401 (Aug 05, 2016) (9 pages) Paper No: PVT-15-1227; doi: 10.1115/1.4033941 History: Received October 21, 2015; Revised June 15, 2016

The effect of welding residual stress on the buckling behavior of storage tanks subjected to the harmonic settlement was simulated using the shell-to-solid coupling method. In the numerical model of tanks coupled with the welding residual stress, the welding joint and its adjacent zone were modeled using the solid submodel and the zone far away from the welding joint was built by the shell submodel. Effects of welding parameters (e.g., welding velocities and welding passes) on the buckling behavior of tanks were analyzed systematically. Results indicate that the buckling strength of tanks is enhanced due to the welding residual stress. Comparatively, a slow welding velocity presents a more remarkable strengthening effect than the fast welding velocity due to a larger axial residual stress produced at the welding joint. Nevertheless, no significant difference between the double-side welding and the one-side welding for buckling strength enhancement is observed for the cases studied. This indicates that the current design method causes a conservative design without considering the welding residual stress.

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Copyright © 2017 by ASME
Topics: Welding , Stress , Buckling
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References

Figures

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Fig. 1

Finite-element model of the tank: (a) mesh model, (b) local mesh model in the vicinity of welding joint, (c) shell-solid coupling diagram, and (d) mesh model of the welding joint

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Fig. 2

Material parameters of Q345R steel at various temperatures

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Fig. 3

Comparisons of welding residual stress distributions for models with two mesh densities: (a) Mises stress (small mesh density), (b) Mises stress (high mesh density), (c) axial stress(small mesh density), (d) axial stress (high mesh density), (e) hoop stress (small mesh density), and (f) hoop stress (high mesh density)

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Fig. 4

Welding residual stress distributions of the tank along paths A and B

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Fig. 5

Equilibrium paths of the tank subjected to harmonic settlement with and without welding residual stress: (a) n = 8, (b) n = 10, and (c) n = 14

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Fig. 6

Buckling modes of the tank subjected to harmonic settlement with and without welding residual stress: (a) buckling mode for n = 8 (without residual stress), (b) buckling mode for n = 8 (with residual stress), (c) buckling mode for n = 10 (without residual stress), (d) buckling mode for n = 10 (with residual stress), (e) buckling mode for n = 14 (without residual stress), and (f) buckling mode for n = 14 (with residual stress)

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Fig. 7

Axial and hoop residual stress distributions of the tank (welding velocity of 6 mm/s): (a) axial residual stress distribution of the weld and (b) hoop residual stress distribution of the weld

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Fig. 8

Axial and hoop stress distribution of the tank for various welding velocities (path B): (a) axial stress and (b) hoop stress

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Fig. 9

Equilibrium paths of the tank for various welding velocities

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Fig. 10

Axial and hoop stress distributions of the tank: (a) axial stress and (b) hoop stress

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Fig. 11

Equilibrium paths of the tank for various welding passes

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