欢迎来到天天文库
浏览记录
ID:39780523
大小:321.54 KB
页数:7页
时间:2019-07-11
《Variation regularity of metal magnetic memory signals with inspecting time-interval and location》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、万方数据J.Cent.SouthUniv.Techn01.(2007)03—0319-05DoI:10.1007/sll771—007—0063—7Variationregularityofmetalmagneticmemorysignalswithinspectingtime—intervalandlocationYANChun—yan(严春妍)1,LIWu.shen(李午申)1,DIxin-jie(邸新杰)1,XUEZhen.kui(薛振奎)2,BAIShi—wu(白世武)2,LIUFang.Hling(刘方明)2(1.SchoolofMaterials
2、ScienceandEngineering,TianjinUniversity,Tianjin300072,China;2.Petroleum—GasPipelineResearchInstituteofChina,Langfang065000,China)垒SpringerAbstract:Influencesofinspectingtime.intervalandlocationonvaryingbehaviorofmetalmagneticmemoryfMMMlsignalsofde埯ctswerestudied.Differentareasintwo
3、precrackedweldmentswereinspectedatdifferenttime—intervalsbytypeTSC一1M-4stress—concentrationmagneticinspectortoobtainMMMsignals.MechanismsofMMMsignalsvaryingbehaviorwithinspectingtimeandspacewereanalyzedanddiscussedrespectively.ItisfoundthatMMMsignalsdon’tchangewithinspectingtime—in
4、terval.sincestressfieldandmagneticleakagefieldmaintainunchangedatanytimeafterwelding.Ontheotherhand,MMMsignalsdiffergreatlyfordifferentinspectinglocations,becausestressfieldandmagneticleakagefieldareunevenlydistributedindefectiveferromagneticmaterials.Keywords:nondestructivetesting
5、;metalmagneticmemory;inspectinginterval;inspectinglocation1IntroductionStressconcentrationisoneofthefatalfactorscausingfatiguefractureofferromagneticequipmentsandstructures.Efiectiveearlydiagnosisanddetectionofstress—concentratedzonesbeforedamagearedemandedtopreventabruptfailures.R
6、eputedastheonlyeffc:ctivenondestructivetesting(NDT)methodforearlydefectdiagnosisanddetectionsofar,metalmagneticmemory(MMMlwasfirstlyputforwardat50thInternationalWeldingConfc:rencein1997.UnlikeconventionalNDTmethods,MMMinspectingtechniquecanbeutilizedtoimplementearlydetectionofdefec
7、tivepanswithhighstressconcentrationininspectedferromagneticstructuresandcomponents【1。“.ThefundamentalprincipleofMMMtestingistodetecttheself-magneticleakagefield.whichgeneratesinstablegliding.dislocationzoneswithstressconcen仃ationinferromagneticmaterials.Instress—concentratedpartsof
8、ferromagneticstructures.ta
此文档下载收益归作者所有