励磁作用下铁磁管道缺陷磁特性仿真  

Magnetic Property Simulation of Defects in Ferromagnetic Pipes under Magnetization

作　　者：张丽攀[1] 马冰洋[1] 宋凯[1] 王振[2] ZHANG Lipan;MA Bingyang;SONG Kai;WANG Zhen(Key Laboratory of Nondestructive Testing,Ministry of Education,Nanchang Hangkong University,Nanchang,330063;Science and Technology College of Nanchang Hangkong University,Nanchang,330063)

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,南昌330063 [2]南昌航空大学科技学院,南昌330063

出　　处：《中国机械工程》2018年第16期2003-2009,共7页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(51265041);国家重大科学仪器设备开发专项(2013YQ140505);国家公益性行业科研专项(201510066);无损检测技术教育部重点实验室开放基金资助项目(EW201708252);航空科学基金资助项目(GA201708257)

摘　　要：通过有限元法建立了管道直流磁化的三维模型,分析了励磁状态下铁磁材料的磁特性、缺陷附近材料的磁导率分布特征以及励磁强度、管道厚度、缺陷深度对磁导率分布的影响。结果表明,饱和磁化后缺陷区域的磁导率分布并不均匀,励磁作用下内壁缺陷可引起外表面磁导率的改变,从而揭示了铁磁性管道内部缺陷检出机理,拓展了涡流检测方法的应用范围。A 3D model of DC magnetization pipes was built with finite element method.Meanwhile the ferromagnetic material magnetic properties and the distribution of magnetic permeability around defect areas were analyzed.The effects of magnetization intensity,the thicknesses of the pipes and the depths of the flaws on magnetic permeability distribution were studied.The results show that the magnetic permeability of the defect areas is uneven distributed while saturation magnetized,and the internal defects may even cause the magnetic permeability of exterior surface changing under magnetization.The mechanism of internal defects on the ferromagnetic pipes is revealed,and the applications of the eddy current testing method are expanded.

关 键 词：铁磁管道 磁化 磁导率 涡流检测 

分 类 号：TG115.28[金属学及工艺—物理冶金]