油气管道缺陷漏磁检测有限元模拟  

Finite Element Simulation of Magnetic Flux Leakage Detection for Oil and Gas Pipeline Defects

作　　者：苏林 成文峰 许志军 储玲玉 徐磊华[2] 徐杰[2] 吉喆[2] SU Lin;CHENG Wenfeng;XU Zhijun;CHU Lingyu;XU Leihua;XU Jie;JI Zhe(SINOPEC Oil&Gas Pipeline Inspection Co.,Ltd.,Xuzhou 221008,Jiangsu,China;School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)

机构地区：[1]中石化长输油气管道检测有限公司,江苏徐州221008 [2]中国矿业大学材料与物理学院,江苏徐州221116

出　　处：《焊管》2020年第4期8-13,22,共7页Welded Pipe and Tube

基　　金：国家自然科学基金资助项目“裂尖约束效应对高钢级管线钢断裂韧性影响的研究”(项目编号51301197);江苏省自然科学基金资助项目“裂尖约束效应对高钢级管线钢韧性断裂行为影响的研究”(项目编号BK20130182);中国石油化工股份有限公司资助项目“管道焊缝及凹陷的全方位三轴超高清内检测及信号评价技术研究”(项目编号318019-2)。

摘　　要：为了研究油气管道缺陷的漏磁信号特征,基于漏磁检测技术基本原理,采用有限元方法,应用ANSYS软件对含裂纹和气孔缺陷管道磁化后产生的漏磁场进行模拟仿真,得到了描述漏磁场特征的磁通密度径向和轴向分布曲线。通过改变裂纹和气孔的尺寸,得出这两种缺陷形式不同尺寸下的漏磁场分布规律。结果表明,随着裂纹深度增加,磁通密度径向、轴向分量的峰值强度均明显增大;在距管壁表面相同深度下,气孔缺陷磁通密度的峰值随孔径增加而显著增大;相同孔径时,气孔距表面越近,漏磁信号越强。为管道漏磁检测过程中的裂纹和气孔缺陷的特征识别提供了理论基础和实践依据。In order to study the magnetic flux leakage signal characteristics of the oil and gas pipeline defects,based on the basic principle of the magnetic flux leakage detection technology,the magnetic flux leakage field generated by the magnetization of the pipelines with the cracks and the porosity defects is simulated by using the finite element method and ANSYS software,and the radial and axial distribution curves of the magnetic flux density describing the characteristics of the magnetic flux leakage field are obtained.By changing the size of the cracks and pores,the distribution law of the magnetic flux leakage field under the different sizes of these two kinds of defects is obtained.The results show that with the increase of the crack depth,the peak strengths of the radial and axial components of the magnetic flux density increase obviously.At the same depth from the surface of the tube,the peak value of the magnetic flux density expands with the increase of the pore diameter.With the same diameter,the closer the pores are to the surface,the stronger the MFL signal is.All these provide a theoretical and practical basis for the feature recognition of the cracks and porosity defects in pipeline magnetic flux leakage testing.

关 键 词：管道缺陷 漏磁检测 裂纹 气孔 有限元模拟 

分 类 号：TG115.28[金属学及工艺—物理冶金]