Title of article
Advancedflawproductionmethodforin-serviceinspectionqualificationmock-upsOriginalResearchArticle
Author/Authors
MikaKemppainen، نويسنده , , IikkaVirkkunen، نويسنده , , JormaPitk?nen، نويسنده , , RaimoPaussu، نويسنده , , HannuH?nninen، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2003
Pages
13
From page
105
To page
117
Abstract
Oneofthekeyissuesinin-serviceinspectionqualificationistherepresentativenessofthedefectsusedinqualificationspecimens.Thebestrepresentativenessisachievedwithrealisticdefects.However,presentspecimenproductiontechniqueshavesomesignificantweaknesses,suchasunrealisticdefectsoradditionalalterationsinducedinthesurroundingmaterial.Specimensmanufactured,forexample,byweldimplantationorwithweldsolidificationdefectsalwaysresultinoneormoreextraweldinterfaces.TheseinterfacescanbedetectedbyNDT.Toovercomeproblemswiththecurrentspecimens,anewdefectmanufacturingtechniquewasdeveloped.Thenewtechniqueproducesnatural,representativedefectswithoutintroducingadditionalweldmetalorotherunwantedalterationstothespecimen.
Thenewmethodenablesartificialproductionofsingle,separatefatiguecracksbythermalloading.Themethodisbasedonanaturalthermalfatiguedamagemechanismandenablesproductionofrealcracksdirectlyintothesamples.Cracksareproducedwithoutweldingormachiningandwithoutanypreliminarysurfacetreatmentorartificialinitiatorsuchasanotchoraprecrack.Singlecrackoranetworkofcrackscanbeinducedintothebasematerial,weldedareas,HAZ,weldcladdings,threadedareas,T-joints,etc.Thelocation,orientationandsizeofproducedcrackscanbeaccuratelycontrolled.Producedcrackscanbeusedtosimulatedifferenttypesofservice-inducedcrackssuchasthermalfatigue,mechanicalfatigueandstresscorrosioncracks.Itisshownthatartificiallyproducedthermalfatiguecrackscorrespondwellwiththereal,service-inducedcracksandovercometheproblemsoftraditionalqualificationspecimenmanufacturingtechniques.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2003
Journal title
Nuclear Engineering and Design Eslah
Record number
894575
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