Magnetic field and magnetic induction spatial distribution and stress-magnetic variation models of natural gas pipelines magnetized

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-03-29 DOI:10.1016/j.tws.2025.113254

Zhaoyang Han, Guangyuan Weng, Xinlei Xing, Yao Zhai, Le Wang, Xiyu Zhu, Bo Wang

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引用次数: 0

Abstract

This study investigates the numerical relationship between the magnetic properties of pipeline steel and the stress-magnetic induction in natural gas pipelines through magnetic simulation and experimental research, based on multi-physical field coupling. A finite-element models for magnetomechanical interactions in natural gas pipelines, constructed from steel grades X52, X56, X60, X65, X70, and X80, was developed utilizing COMSOL Multiphysics software. The simulations were conducted under seven different internal pressures (0 MPa, 2 MPa, 4 MPa, 6 MPa, 8 MPa, 10 MPa, and 12 MPa) and three pipe diameters (300 mm, 406 mm, and 670 mm). These simulations facilitate the analysis of magnetic field and magnetic induction distributions within the spatial area of the pipelines. The study also examined the technical parameters for magnetization saturation across the various steel grades. A numerical relationship curve of stress and magnetic induction relative to pipeline length, termed the σB-L curve, was established. The reliability of the simulation results and the numerical model was validated using pipelines made from X80 and X70 steel grades. The findings confirm that the characteristics of the saturated magnetic field distribution and magnetic induction in natural gas pipelines are consistent across different steel grades. A consistent linear relationship exists between the peak internal pressure of the pipeline and the magnetic flux density. Additionally, under locally uniform magnetic fields, the trends in stress and magnetic induction density changes are parallel both along the length and across the cross-sectional direction of the pipeline. The σB-L curve accurately represents the magnetic coupling relationship. Experimental validation indicated that the σB-L curve derived from the numerical simulations provides high accuracy in assessing the magnetic-coupling stress, with a maximum error of less than 5%. This establishes a reliable theoretical basis for non-destructive, online stress detection in operational natural gas pipelines.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.