Numerical study on the strain capacity of girth-welded X80 grade pipes

作     者：Xu Wang Jian Shuai Sheng-Zhu Zhang Wei Ren Xue-Ming Zhu 

作者机构：College of Safety and Ocean EngineeringChina University of PetroleumBeijing102249China Department of Structural EngineeringNorwegian University of Science and Technology(NTNU)Trondheim7491Norway China Academy of Safety Science and TechnologyBeijing100012China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2022年第19卷第5期

页      面：2399-2412页

核心收录：

学科分类：0820[工学-石油与天然气工程] 080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 082003[工学-油气储运工程] 

基　　金：supported by the grants from the National Natural Science Foundation of China(Grant No.51874324) the Chinese Scholarship Council(CSC)for the financial support 

主　　题：Strain capacity Girth-welded X80 grade pipes Mismatch and softening 

摘      要：Strain capacity is an important performance indicator for designing and evaluating high-grade steel *** to the inhomogeneity of material properties in welded structures,girth welds are one of the main factors that restrict the strain capacity of *** this paper,girth-welded pipes with cracks in the inner surface of the weld have been studied,and the ductile crack initiation and propagation behavior have been simulated using the Gurson *** corresponding nominal strain at the onset of crack initiation was defined as the characteristic value of strain *** influencing factors on the strain concentration area,strain concentration factor,and strain capacity of girth-welded pipes were quantitatively analyzed.A semiempirical calculation formula for the strain capacity of typical girthwelded X80 grade pipes has been proposed as a function of the crack size,mismatch coefficient of the weld,and softening degree of the heat affected zone(HAZ).This study can facilitate the defect assessment of girth-welded pipes.