摘要
金属磁记忆检测技术是一种新型的无损检测技术,它利用金属的磁记忆效应来确定构件的缺陷区域.检测中由于一些构件表面感应磁场信号不平滑,存在与缺陷信号相似的磁场特征和梯度表现,容易造成漏判或误判.为了区分这两种信号,通过建立磁偶极子模型,分析了缺陷在材料表面或近表面的情况下检测提离值对磁信号的影响,发现在提离值改变时感应磁场和缺陷漏磁场存在不同的表现.根据这一现象,提出多提离值检测方法进行精确定位.通过对钢板进行实验验证了该方法的有效性.
Metal magnetic memory （MMM） testing technique is a novel nondestructive technology that tests the defects of ferromagnetic material utilizing magnetic memory effect. Sometimes the induced mag- netic field on the material surface is not smooth, and the magnetic signals and gradient features of the non-defects are similar to those of the defects, which easily leads to misjudgment and omission. To distin- guish these two signals, the influence of lift-off values is analyzed by building a magnetic dipole model. Results show that changes of lift-off values have different influences on induced magnetic signals and defect magnetic signals when the defect is on or near the surface of the material. A multiple lift-off values method is correspondingly proposed to accurately position defects and is verified through experimental results.
作者
陈世利
庞煜
唐玉莲
黄新敬
Chen Shili Pang Yu Tang Yulian Huang Xinjing(School of Precision Instrument and Opto-Electronics Engineering ,Tianjin University,Tianjin 300072, Chin)
出处
《纳米技术与精密工程》
CAS
CSCD
北大核心
2016年第6期421-428,共8页
Nanotechnology and Precision Engineering
基金
国家自然科学基金资助资助项目(61473205)
天津市科技兴海资助项目(KJXH2013-06)
天津市科技支撑计划资助项目(14ZCZDGX00003)
关键词
金属磁记忆
磁偶极子模型
提离值
定位方法
metal magnetic memory
magnetic dipole model
lift-off value
positioning method
