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research-article

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
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
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
y10160226@mail.ecust.edu.cn

Huan Sheng Lai

School of Chemical Engineering, Fuzhou University, Fuzhou, Fujian 350-116, China
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
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
sttu@ecust.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4043463 History: Received December 24, 2018; Revised April 02, 2019

Abstract

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 the present 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 modelling 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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