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Research Papers: Materials and Fabrication

Welding Residual Stress in HDPE Pipes: Measurement and Numerical Simulation

[+] Author and Article Information
Yu Sun

Key Laboratory of Pressure Systems and Safety,
MOE,
School of Mechanical and Power Engineering,
East China University of
Science and Technology,
Shanghai 200237, China
e-mail: neusunyu@163.com

Yun-Fei Jia

Key Laboratory of Pressure Systems and Safety,
MOE,
School of Mechanical and Power Engineering,
East China University of
Science and Technology,
Shanghai 200237, China
e-mail: yfjia@ecust.edu.cn

Muhammad Haroon

Key Laboratory of Pressure Systems and Safety,
MOE,
School of Mechanical and Power Engineering,
East China University of
Science and Technology,
Shanghai 200237, China
e-mail: y10160226@mail.ecust.edu.cn

Huan-sheng Lai

School of Chemical Engineering,
Fuzhou University,
Fuzhou, Fujian 350-116, China
e-mail: sheng158@hotmail.com

Wenchun Jiang

State Key Laboratory of Heavy Oil Processing,
College of Chemical Engineering,
China University of Petroleum (East China),
Qingdao 266580, China
e-mail: jiangwenchun@upc.edu.cn

Shan-Tung Tu

Key Laboratory of Pressure Systems and Safety,
MOE,
School of Mechanical and Power Engineering,
East China University of
Science and Technology,
Shanghai 200237, China
e-mail: sttu@ecust.edu.cn

1Corresponding authors.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 24, 2018; final manuscript received April 2, 2019; published online May 8, 2019. Assoc. Editor: Oreste S. Bursi.

J. Pressure Vessel Technol 141(4), 041404 (May 08, 2019) (9 pages) Paper No: PVT-18-1281; doi: 10.1115/1.4043463 History: Received December 24, 2018; Revised April 02, 2019

To understand the residual stress distribution in the welded joints of high density polyethylene (HDPE) pipes is essential to the assessment of its structural integrity. However, limited knowledge of their residual stress was available in this regard. In this paper, the hole-drilling strain-gage method was used to measure the residual stress in the welded seam of HDPE pipes, which was produced by the butt fusion welding technique. The finite element modeling using viscoelastic constitutive model with Prony series was carried out to determine the temperature field and corresponding stress field in the welding stages. The measured residual stress near the surface shows good consistency with the numerical results. It is shown that the residual stress in the hoop direction is much larger than those in the radial and axial directions. The effect of the pipe thickness on the residual stress distribution was also investigated by numerical simulation. The positions of the maximum tensile stress in the welded joints were found within the normalized depth region (the radial depth to the thickness) of 0.2 to 0.8.

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Figures

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Fig. 1

Schematic showing butt fusion welding method of HDPE pipes in different stages [28]

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Fig. 2

Schematic of specimens from HDPE pipes' welded surface region for (a) tensile test (b) and stress relaxation test (c)

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Fig. 3

(a) Tensile stress–strain curve and (b) stress relaxation curve of welded joints specimen at 28 °C

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Fig. 4

(a) Geometrical model and (b) finite element mesh used in the modeling for HDPE pipes welded joints

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Fig. 5

Variation of the tested strain along three directions (a) and the calculated principal residual stress (b) with the drilling depth for the pipe thickness of 18.2 mm

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Fig. 6

Variation of the tested strain along three directions (a) and the calculated principal residual stress (b) with the drilling depth for the pipe thickness of 12.7 mm

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Fig. 7

The temperature distribution along the thickness in each welding stage during butt fusion welding process

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Fig. 11

Comparison of maximum residual tensile stress in the three different directions with different pipe thicknesses (a), and the normalized depth region where existing maximum residual hoop tensile stress for different pipe thicknesses (b)

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Fig. 10

Variation of the residual hoop stress at different depths of the welded seam from the outside surface to the insider surface along with the welding time for the typical pipe thicknesses of 5 mm (a) and 40 mm (b), respectively

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Fig. 9

The simulated temperature field of HDPE pipes at different welding stages for five different thicknesses along the radial direction

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Fig. 8

The residual stress in (a) hoop, (b) radial, and (c) axial direction as a function of the normalized depth of the pipe for the two pipe thicknesses of 12.7 and 18.2 mm by finite element analysis. (d) The experimentally measured residual hoop stress was compared with the present FE results within the depth of h/t from 0 to 0.1. The results from the experimental data of Williams et al. [14] and Poduška et al. [15,16] as well as the numerical data of Kabaneimi et al. [19] are shown in the figure for comparison.

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