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ID:55975445
大小:3.78 MB
页数:8页
时间:2020-03-23
《基于微分磁导率的铁磁性材料无损检测新方法.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第38卷第6期仪器仪表学报Vol38No62017年6月ChineseJournalofScientificInstrumentJun.2017基于微分磁导率的铁磁性材料无损检测新方法吴德会,刘志天,王晓红,苏令锌(厦门大学航空航天学院厦门361005)摘要:利用微分磁导率变化特性,提出了一种可对材料的宏观缺陷进行快速扫查的无损检测新方法。首先,将铁磁性材料置于偏置磁化场环境下,缺陷将导致内部磁通的畸变;其次,磁通畸变进一步体现在材料表面微分磁导率分布的差异性;再次,通过特殊设计的微分磁导率检测探头,对材料表面微分磁导率的分布进行
2、扫查;最后,由磁导率分布差异获得材料内部的不连续性信息,从而实现对缺陷的无损检测。开展了系列验证实验,结果表明,相对于传统的漏磁检测方法,新方法具有磁化强度低、磁通泄漏少、检测信号稳定的特点。新方法正、反面缺陷探测信号存在差异,在缺陷深度识别方面亦存在优势。关键词:微分磁导率;宏观缺陷;无损检测;偏置磁化场+中图分类号:TP212.9TP211.5TH87文献标识码:A国家标准学科分类代码:460.4030NewNDTmethodforferromagneticmaterialsbasedondifferentialpermeabili
3、tyWuDehui,LiuZhitian,WangXiaohong,SuLingxin(SchoolofAerospaceEngineering,XiamenUniversity,Xiamen361005,China)Abstract:Anewnondestructivetestingmethodisproposedtofastscananddetectthemacroscopicdefectsofmaterialsusingthevariationcharacteristicsofthedifferentialpermeabilit
4、yofferromagneticmaterials.Firstly,theferromagneticmaterial,suchassteelplate,isplacedunderthebiasmagneticfield,andthedefectsinthematerialwillinevitablyleadtothedistortionofitsinternalmagneticflux.Secondly,themagneticfluxdistortionisfurtherreflectedinthedifferenceofthediff
5、erentialpermeabilitydistributiononthesurfaceofthetestedmaterial.Thirdly,usingaspeciallydesignedprobe,thedistributionofdifferentialpermeabilityonthesurfaceoftestedmaterialisrapidlyscanned.Finally,fromthedifferenceofthedifferentialpermeabilitydistribution,thediscontinuityi
6、nformationinthematerialcanbeobtained,soastorealizethenondestructivetestingofmacroscopicdefects.Seriesofexperimentswerecarriedout,andtheresultsshowthat,comparedwithtraditionalmagneticfluxleakagemethod,thenewmethodhastheadvantagesoflowmagneticintensity,lessfluxleakageandst
7、abledetectionsignals.Moreover,thedetectionsignalsforthefrontsideandbacksidedefectshaveobviouslydifferentdistributioncharacteristics,andthemethodalsohasobviousadvantagesinthefieldofdefectdepthidentification.Keywords:differentialpermeability;macroscopicdefect;nondestruc
8、tivetesting(NDT);biasmagneticfield化方面,国内外学者已进行大量的研究,并取得了一定的[3]1引言成果。任尚坤等人开发了微分磁导率检测的实验平台,对拉应力和疲劳造成的微损伤与
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