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1、ARTICLEINPRESSNDT&EInternational42(2009)599–605ContentslistsavailableatScienceDirectNDT&EInternationaljournalhomepage:www.elsevier.com/locate/ndteintPulsededdycurrenttestingwithvariabledutycycleonrivetjointsa,baaIlhamZainalAbidin,CatalinMandache,GuiYunTia
2、n,MaximMorozovaSchoolofElectrical,ElectronicandComputerEngineering,NewcastleUniversityNE17RU,England,UnitedKingdombInstituteforAerospaceResearch,NationalResearchCouncilCanada,Ottawa,Ontario,CanadaK1A0R6articleinfoabstractArticlehistory:Inpulsededdycurrentt
3、esting,repetitiveexcitationsignalswithdifferentdutycycleshavedifferentReceived20November2008spectralrepresentations.Thisworkstudiesthein?uenceofdutycycleontheabilitytodetectholesandReceivedinrevisedformEDMnotchesbeneathrivetheadsinsubsurfacelayersofstrati?
4、edsamples.Featurepatternsforthe2April2009integrityofrivetjointsareproposedandveri?ed.TheproposedmethodhastheaddedadvantageinthatAccepted7April2009noreferencesampleisneededwhileemployingmultiplepulsemeasurements,withdifferentpulseAvailableonline17April2009w
5、idths.ExperimentaltestingandmodellingapproachesarediscussedinconnectionwithdefectdepthKeywords:quanti?cation,whichcanbeextendedtothequanti?cationofcomplexdefects.Pulsededdycurrent&2009ElsevierLtd.Allrightsreserved.PulsewidthFiniteelementanalysis1.Introduct
6、iondoesanditismoreeconomicalandmoreeasilyappliedthanradiography.ECtestingisbasedontheprincipleofelectromag-Rigorousdamagetolerancecalculationsshouldtakeintoneticinductionwhereanalternatingmagnetic?eldinacoilaccountnotonlythesizeofadefectbutalsothelocationo
7、fthatinduceselectric(eddy)currentsinanelectricallyconductivetestdefectwithintheexaminedpart,whenpredictingthelifetimeofapiecebroughtintotheproximityofthecoil.Secondarymagneticcomponent.Thisisespeciallytrueinaircraftstructures,whichare?eldoftheinducededdycu
8、rrentsimpedesthediffusionofthenormallycomposedofmultiplelayers,withvariablethickness,externalelectromagnetic?eldintoasample.Thestandarddifferentmaterials,etc.Forexample,dependingonthetype,depthofpenetrationd,
