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Research Papers: Materials and Fabrication

A Unified Shakedown Assessment Method for Butt Welded Joints With Various Weld Groove Shapes

[+] Author and Article Information
Xiao-Tao Zheng, Chang-Fei Peng, Cheng-Gang Wang, Wei Lin

Hubei Provincial Key Laboratory of Chemical
Equipment Intensification and Intrinsic Safety,
Wuhan Institute of Technology,
693 Xiongchu Avenue,
Wuhan 430073, Hubei, China

Jiu-Yang Yu

Hubei Provincial Key Laboratory of Chemical
Equipment Intensification and Intrinsic Safety,
Wuhan Institute of Technology,
693 Xiongchu Avenue,
Wuhan 430073, Hubei, China
e-mail: jyyu@mail.wit.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 May 12, 2013; final manuscript received July 1, 2014; published online November 21, 2014. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 137(2), 021404 (Apr 01, 2015) (8 pages) Paper No: PVT-13-1081; doi: 10.1115/1.4028761 History: Received May 12, 2013; Revised July 01, 2014; Online November 21, 2014

A unified shakedown assessment approach for butt welded pipes or cylindrical pressure vessels with common circumferential butt welded joints for U-groove, V-groove, X-groove, double U-groove (DU-groove), UV-groove, and single-side welding was established under cyclic thermomechanical loadings based on the simplified finite element method. Individual effects of material properties of weld metal (WM), heat affected zone (HAZ), and parent material (PM), the ratio of inner radius, and wall thickness were further considered. Results showed that the proposed method has a high accuracy for shakedown evaluation of weld pipes with various weld groove shapes. Moreover, U-groove is fit for weld pipes to improve the load-carrying capacity of thick-walled cylinders under cyclic thermomechanical loading. Furthermore, the ratio of the yield stress between WM and PM should be greater than the transition point for weld pipes with various weld groove shapes to avoid ratchet first occurs in the WM region.

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Figures

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Fig. 1

Geometrical configuration for pipes with various welded grooves: (a) welded pipe, (b) UV-groove, (c) DU-groove, (d) X-groove, (e) U-groove, (f) V-groove, and (g) single-side weld

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Fig. 2

Boundary conditions of the welded pipe

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Fig. 3

Finite element mesh with DU-groove, X-groove, U-groove, single-side welding, V-groove, and the corresponding contours of von Mises equivalent stress (MPa) for ΔT = 300 °C

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Fig. 4

Verification of the shakedown limit obtained by NLSM

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Fig. 5

Shakedown limit of welded pipes with different groove shapes: (a) t = 20 mm, (b) t = 40 mm, and (c) t = 80 mm

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Fig. 6

Shakedown regions of UV-groove weld joints with different thicknesses

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Fig. 7

Shakedown limit interaction curves of the weld pipe with the different yield stress of WM

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Fig. 8

Effect of the yield stress on the reverse plastic limit with different grooves

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Fig. 9

Shakedown limit interaction curves of the weld pipe with different Young's modulus

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Fig. 10

Shakedown limit interaction curves of the weld pipe with different thermal expansion coefficients

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Fig. 11

Verification of the proposed shakedown estimation model

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