depth-resolved residual stress analysis of thin coatings by a new fib

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1、EngineeringFractureMechanics96(2012)276–293ContentslistsavailableatSciVerseScienceDirectEngineeringFractureMechanicsjournalhomepage:www.elsevier.com/locate/engfracmechInvestigationoffractureinsmall-scaleSENTtestsofaweldedX80pipelinesteelusingDigitalImageCorrelationwithnodesplittinga,⇑ba,caE.Fagerho

2、lt,E.Østby,T.Børvik,O.S.HopperstadaStructuralImpactLaboratory(SIMLab),CentreforResearch-basedInnovation(CRI)andDepartmentofStructuralEngineering,NorwegianUniversityofScienceandTechnology,Rich.Birkelandsvei1A,NO-7491Trondheim,NorwaybSINTEFMaterialsandChemistry,DepartmentofAppliedMechanicsandCorrosio

3、n,NO-7465Trondheim,NorwaycNorwegianDefenceEstatesAgency,Research&DevelopmentDepartment,PB405,Sentrum,NO-0103Oslo,NorwayarticleinfoabstractArticlehistory:SingleEdgeNotchTension(SENT)testshavebeencarriedoutongirthweldedX80pipelineReceived12January2012steelusingtwodifferentweldmaterialstoinvestigateth

4、eeffectofweldmetalmismatchReceivedinrevisedform4June2012onductilecrackgrowth.InadditiontothetraditionalclipgaugeCMOD/CTODmeasure-Accepted3August2012ments,informationhasbeenobtainedbyapplyingDigitalImageCorrelation(DIC).TheDICmeshhasbeenmodifiedtoallowfornodesplittinginordertocapturethediscontin-uous

5、displacementfieldofthepropagatingcrack.Parameterssuchascrackpath,crackKeywords:lengthandcrackopeninghavebeensuccessfullymeasuredusingthismodificationtoDICthestandardDICanalysis.Thepapercontainsadescriptionofthematerialandtheexper-NodesplittingSENTspecimensimentalsetup,aswellasresultsfromtheexperiment

6、altests,wheretheSENTspecimensCrackpropagationhavebeensubjectedtomonotonictensionloading.EmphasisislaidontheDICanalysisandtheadditionalinformationgainedfromthisapproach.ParallelizationoftheDICalgo-rithmandadiscussionontheaccuraciesof2Dversus3DDICanalysesarealsoincludedinthispaper.Ó2012ElsevierLtd.Al

7、lrightsreserved.1.IntroductionModernpipelinedesignfacesseveralchallengesasonemoveintonewareaslikedeepwatersandarcticregions.Atthesametimethereisadrivetodevelopmorecosteffectiveinstallationproceduresbye.g.re