Study on of Internal Characteristics Detection of Weak Magnetic Stress in Pipelines under Excitation of External Magnetic Field

doi:10.3969/j.issn.1672-6952.2021.05.010

Journal of Liaoning Petrochemical University ›› 2021, Vol. 41 ›› Issue (5): 55-60.DOI: 10.3969/j.issn.1672-6952.2021.05.010

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Study on of Internal Characteristics Detection of Weak Magnetic Stress in Pipelines under Excitation of External Magnetic Field

Zhijun Xu¹(), He Zhang²(), Ning Luo²

^1.National Pipeline Network Group East Crude Oil Storage and Transportation Co. Ltd. ，Xuzhou Jiangsu 221000，China
^2.School of Information Science and Engineering，Shenyang University of Technology，Shenyan Liaoning 110870，China

Received:2020-12-17 Revised:2021-03-11 Published:2021-10-25 Online:2021-11-09
Contact: He Zhang

外磁场激励下管道弱磁应力内检测特性研究

许志军¹(), 张贺²(), 罗宁²

^1.国家管网集团东部原油储运有限公司，江苏徐州 221000
^2.沈阳工业大学信息科学与工程学院，辽宁沈阳 110870

通讯作者: 张贺
作者简介:许志军（1965⁃），男，高级工程师，从事储运工程与检验检测技术方面的研究； E⁃mail：xuj601@126.com。
基金资助:
国家自然科学基金项目(61871450)

Abstract

Abstract:

The weak magnetic stress detection technology supports non?contact online detection of stress damage. It has great application potential in the field of long?distance oil and gas pipeline stress detection technology. However, as the weak magnetic signal is weak and easy to be interfered by the external environment,the detection result is prone to deviation.In order to strengthen the detection ability of weak magnetic signals, based on the microscopic characteristics of ferromagnetic materials, a weak magnetic stress detection model under an external magnetic field was established, and the change law of weak magnetic signal strength with the increase of external magnetic field strength and applied stress was obtained.The excitation characteristics of the external magnetic field to the weak magnetic stress detection signal were described,and a systematic experimental study was conductd.The results show that the tangential peak value and the normal zero point of the weak magnetic signal are located in the center of the stress concentration area, and do not fluctuate with the change of the stress and the external magnetic field.The tangential peak value and the normal peak?peak of the weak magnetic signal increase with the increase of the external magnetic field and stress. As the external magnetic field increases, the excitation effect of the external magnetic field on the weak magnetic stress detection signal increases first and then decreases.

Key words: Weak magnetic, Pipeline, Stress, External magnetic field

摘要：

弱磁应力检测技术支持非接触在线应力损伤检测,在长输油气管道应力内检测技术领域具有巨大的应用潜力。但弱磁信号微弱，易受外界环境干扰，检测结果易出现偏差。为加强弱磁信号的检测能力，基于铁磁材料的微观特性，建立了外磁场弱磁应力检测模型，获得了弱磁信号强度随外磁场强度与施加应力的变化规律，描述了外磁场对弱磁应力检测信号的激励特性，并进行了系统的实验研究。结果表明，弱磁信号的切向峰值与法向零点均位于应力集中区的中心位置，且不随应力与外磁场的变化而发生波动；弱磁信号切向峰值与法向峰峰值随外磁场与应力的增加而增大；外磁场对弱磁应力检测信号的激励作用随外磁场的增加先增大后减小。

关键词: 弱磁, 管道, 应力, 外磁场

CLC Number:

TE85

Zhijun Xu, He Zhang, Ning Luo. Study on of Internal Characteristics Detection of Weak Magnetic Stress in Pipelines under Excitation of External Magnetic Field[J]. Journal of Liaoning Petrochemical University, 2021, 41(5): 55-60.

许志军, 张贺, 罗宁. 外磁场激励下管道弱磁应力内检测特性研究[J]. 辽宁石油化工大学学报, 2021, 41(5): 55-60.

Figures/Tables 10

References 15

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Study on of Internal Characteristics Detection of Weak Magnetic Stress in Pipelines under Excitation of External Magnetic Field

外磁场激励下管道弱磁应力内检测特性研究

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References 15

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