Fracture Behavior Analysis of Abnormal Girth Welded Joint of High Grade Steel Pipeline

DOI

10.2991/978-94-6463-564-5_9How to use a DOI?

Keywords

misalignment; unequal wall-thickness; crack driving force; strain bearing capacity

Abstract

In recent years, improving the safety of civil engineering structures has become an important part of structural development. In order to improve the safety of oil and gas transportation systems, it is necessary to focus on pipeline safety. The study focused on an X80 high-grade steel pipeline with a diameter of 1422mm, accurately considering the geometric features of both misalignment and variable wall-thickness in establishing a full-size pipeline finite element model. The initiation behavior of circumferential inner surface cracks under tensile loading was investigated. The computational results indicated that for circumferential welded joints with misalignment, a smaller misalignment and a higher weld strength matching coefficient contribute to reducing the crack driving force. Increasing the strength matching coefficient of the girth weld as much as possible has a good positive effect on resisting the decrease of the bearing capacity caused by the misalignment. For circumferential welded joints with unequal wall thickness, when the wall thickness of the thinner side remains unchanged, the wall thickness ratio has little effect on the bearing capacity of the girth welded joints, which can be ignored. Under the condition of small crack size, the strength matching coefficient can more effectively ensure the high strain capacity of the circumferential weld of the unequal wall thickness pipeline.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Haonan Zhang
AU  - Yue Yang
AU  - Jian Chen
AU  - Xiatong Wu
AU  - Feng Wang
AU  - Hao Wang
AU  - Xiaoben Liu
PY  - 2024
DA  - 2024/10/31
TI  - Fracture Behavior Analysis of Abnormal Girth Welded Joint of High Grade Steel Pipeline
BT  - Proceedings of the 2024 International Conference on Civil Engineering Structures and Concrete Materials (CESCM 2024)
PB  - Atlantis Press
SP  - 77
EP  - 86
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-564-5_9
DO  - 10.2991/978-94-6463-564-5_9
ID  - Zhang2024
ER  -