Vol. 21, No. 3, pp. 253-264 (2025)
STUDY ON FRACTURE BEHAVIOR OF CHS-X JOINTS WITH
WELD DEFECTS
Jia-Xing Wang 1, Xiao-Gui Shi 1, Zheng-Lei Liu 1, Ting Ding 1, Qiu-Zhan Xiang 2 and Zheng-Hua Huang 1, *
1 School of Civil Engineering, Guizhou University, Guiyang550025, China
2 Experimental Center of the School of Civil Engineering, Guizhou University
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 12 November 2024; Revised: 3 January 2025; Accepted: 8 January 2025
DOI:10.18057/IJASC.2025.21.3.7
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ABSTRACT
To study the fracture behavior of circular hollow section (CHS) X-joints with weld defects, an axial tensile static load test was performed on one penetration welding specimen and two non-penetration welding specimens. The VUSDFLD subroutine in the ABAQUS software is utilized to perform finite element analysis (FEA) of CHS-X joints with weld defects. The simulation is based on micromechanical fracture models (VGM model and SWDM model). The results demonstrate that both VGM and SWDM models can precisely forecast the fracture of CHS-X joints, regardless of the presence or absence of weld defects. The accuracy of the simplified weld defects model using the equivalent width method and equivalent area approach is confirmed by comparing it with the test findings. In the comparison of fracture displacement and ultimate load error between FEA and testing, it was shown that the error of the VGM model is within 21%, and the error of the SWDM model is within 17%. The numerical simulation of the SWDM model is closer to the test results than that of the VGM model, which can be well applied to the fracture prediction and fracture path simulation of CHS-X joint defective weld. This paper provides a new method and perspective for analyzing and evaluating the weld fracture behavior of CHS-X joints with weld defects, serving as an important reference for predicting the bearing capacity of CHS-X joints with non-penetration welding in actual engineering applications.
KEYWORDS
CHS-X joints, Defective weld, Fracture behavior, Micromechanical fracture models, Ultimate bearing capacity
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