Page 58 - 无损检测2024年第八期

试验研究
试验研究

DOI：10.11973/wsjc202408005

铁磁性构件内外侧缺陷重合度与

漏磁场信号的关系

洪 勇 ，刘益彰 ，汪 杰 ，伍韶君 ，阮隽宇 1
1
1
2
2
（1. 上海电机学院 机械学院，上海 201306；2. 芜湖市特种设备监督检验中心，芜湖 241002）
摘 要：基于漏磁检测原理，利用COMSOL有限元仿真软件模拟了含缺陷小管径薄壁管道的
漏磁检测信号特征，研究了管壁内外侧都存在缺陷时漏磁场信号的变化情况；同时，采用局部直
流磁化及控制变量的方法研究了管壁内外侧缺陷的漏磁场信号分布。结果表明，管道壁厚在超过
6 mm时得到的漏磁场信号切向分量的双波峰间峰值差较小，内外侧缺陷的重合度在小于40%时已
不易于判定；当缺陷宽度小于2 mm时，漏磁场切向分量分布图中的双波峰间峰值差变化较小，从而
无法对内侧缺陷参数进行判定。该结果为研究内外侧缺陷的重合度与漏磁信号之间的关系以及薄
壁管道的安全评定提供了一定依据。
关键词：漏磁检测技术；有限元分析；管道缺陷；内外侧缺陷重合度
中图分类号：TG115.28 文献标志码：A 文章编号：1000-6656(2024)08-0024-08

Relationship between the overlap of internal and external defects and the leakage magnetic

field signal of ferromagnetic components

HONG Yong , LIU Yizhang , WANG Jie , WU Shaojun , RUAN Juanyu 1
1
2
1
2
（1. Mechanical College, Shanghai Dianji University, Shanghai 201306, China;
2. Wuhu Special Equipment Supervision and Inspection Center, Wuhu 241002, China）
Abstract: Based on the principle of magnetic flux leakage detection, the magnetic flux leakage signal characteristics
of small-diameter thin-walled pipes with defects was simulated by using the finite element software COMSOL, and the
change of magnetic flux leakage signals was studied when there were defects on both the inner and outer sides of the pipe
wall. At the same time, the magnetic flux leakage field signal distribution of internal and external defects in the pipe wall
was studied by using local DC magnetization and method of controlling variables. The results showed that, as the wall
thickness increased to 6 mm, the overlap of internal and external defects with an overlap degree of 40% was no longer easy
to determine; when the width of the defects was less than 2 mm, the differential change of double peak values was small
in the tangential component distribution of the leakage field, which made it impossible to determine the parameters of the
defects on the inner side. This result provided a basis for the study of the relationship between the overlap of the internal and
external defects and the magnetic flux leakage signal, as well as the safety assessment of thin-walled pipes.
Key words: magnetic leakage detection technique; finite element analysis; pipeline defect; internal and external defect overlap

收稿日期：2023-12-23 钢管的无损检测方法主要包括超声检测、磁粉
基金项目：2023 年度安徽省市场监督管理局科技计划项目
检测、漏磁检测、涡流检测等。其中，在不添加耦合
（2023MK041） ；上海电机学院人才引进项目（B1-0288-20-007-01-32）；
上海多向模锻工程技术研究中心项目（20DZ2253200） 剂和不对管道进行破坏的前提下，漏磁检测方法可
作者简介：洪 勇（1983—），男，博士，副教授，高级工程师，主 以对管道内外壁的缺陷进行检测和识别，且在工程
要研究方向为无损检测技术与承压设备检测
上较易进行操作 。
[1]
通信作者：刘益彰（1996—），男，硕士，主要研究方向为漏磁检
测，m18852966597@163.com 近年来，随着漏磁检测在石油业、矿业、航空航
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2024 年 第 46 卷 第 8 期
无损检测