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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天然气管道磁化磁场和磁感应空间分布及应力-磁变化模型

本研究基于多物理场耦合，通过磁场模拟和实验研究，探讨了管道钢的磁性能与天然气管道内应力磁感应强度之间的数值关系。利用COMSOL Multiphysics软件开发了天然气管道中磁力相互作用的有限元模型，该模型由X52、X56、X60、X65、X70和X80等钢牌号组成。在7种不同的内压（0 MPa、2 MPa、4 MPa、6 MPa、8 MPa、10 MPa和12 MPa）和3种管径（300 mm、406 mm和670 mm）下进行了模拟。这些模拟有助于分析管道空间区域内的磁场和磁感应分布。研究还考察了不同钢种磁化饱和度的技术参数。建立了应力和磁感应强度随管道长度的关系曲线，即σB-L曲线。以X80和X70两种钢的管道为例，验证了仿真结果和数值模型的可靠性。结果表明，不同钢种的天然气管道饱和磁场分布和磁感应特性是一致的。管道峰值内压与磁通密度之间存在一致的线性关系。此外，在局部均匀磁场作用下，应力和磁感应密度的变化趋势沿管道长度和横断面方向平行。σB-L曲线准确地反映了磁耦合关系。实验验证表明，数值模拟得到的σB-L曲线具有较高的磁耦合应力评估精度，最大误差小于5%。这为运行中的天然气管道无损在线应力检测奠定了可靠的理论基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.