Numerical simulation on influencing factors of apparent fracture toughness of girth welds on high-grade steel pipelines

Jinxu JIANG; Hong ZHANG; Lei GU; Dong ZHANG; Kai WU; Xiaoben LIU

doi:10.6047/j.issn.1000-8241.2022.03.005

You-qi chuyun (Mar 2022)

Numerical simulation on influencing factors of apparent fracture toughness of girth welds on high-grade steel pipelines

Jinxu JIANG,
Hong ZHANG,
Lei GU,
Dong ZHANG,
Kai WU,
Xiaoben LIU

Affiliations

Jinxu JIANG: China University of Petroleum (Beijing)//National Engineering Laboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology
Hong ZHANG: China University of Petroleum (Beijing)//National Engineering Laboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology
Lei GU: Pipe China North China Company
Dong ZHANG: China University of Petroleum (Beijing)//National Engineering Laboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology
Kai WU: China University of Petroleum (Beijing)//National Engineering Laboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology
Xiaoben LIU: China University of Petroleum (Beijing)//National Engineering Laboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology

DOI: https://doi.org/10.6047/j.issn.1000-8241.2022.03.005
Journal volume & issue: Vol. 41, no. 3
pp. 281 – 287

Abstract

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In this study, numerical simulation analysis on fracture of girth welds on pipelines with crack defect and small Single Edge Notch Beam(SENB) was performed with the finite element method for accurately characterizing the correlation of apparent fracture toughness of the girth welds on high-grade steel pipelines and the small specimens. The conversion coefficient of apparent fracture toughness was introduced by comparing the difference of apparent fracture toughness of the girth welds on full-scale pipelines and the SENB specimens. Conversion coefficients between full-scale pipelines and SENB specimens under different working conditions were obtained by quantitatively studying the impact of pipe diameter, wall thickness, crack length and depth on the apparent fracture toughness of girth welds on full-scale pipelines, realizing quantitative characterization of the apparent fracture toughness of girth welds on high-grade steel pipelines based on the test results of small specimens. The results indicate that the pipe diameter has little effect on the apparent fracture toughness and its conversion coefficient. The conversion coefficient of fracture toughness increases with the increasing of wall thickness and decreases with the increasing of crack length and depth. The effect of crack depth on the apparent fracture toughness of pipelines is more obvious than other influencing factors. A relatively accurate apparent fracture toughness of girth welds on high-grade steel pipelines can be obtained based on the conversion coefficient, providing theoretical reference for accurately characterizing the apparent fracture toughness of girth welds on high-grade steel pipelines.

Published in You-qi chuyun

ISSN: 1000-8241 (Print)
Publisher: Editorial Office of Oil & Gas Storage and Transportation
Country of publisher: China
LCC subjects: Technology: Chemical technology: Oils, fats, and waxes; Technology: Chemical technology: Gas industry
Website: https://yqcy.paperonce.org/en/

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