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1、InternationalJournalofPlasticity27(2011)147–180ContentslistsavailableatScienceDirectInternationalJournalofPlasticityjournalhomepage:www.elsevier.com/locate/ijplasDuctilefracture:Experimentsandcomputationsa,ba,*abH.Li,M.W.Fu,J.Lu,H.YangaDepartmentofMechanicalEngineering,TheHongKongP
2、olytechnicUniversity,HungHom,Kowloon,HongKong,PRChinabSchoolofMaterialsScience,StateKeyLabofSolidificationProcessing,NorthwesternPolytechnicalUniversity,Xi’an,PRChinaarticleinfoabstractArticlehistory:Numerouscriteriahavebeendevelopedforductilefracture(DF)predictioninmetalplasticRece
3、ived15September2009deformation.FindingawaytoselecttheseDFcriteria(DFCs)andidentifytheirapplicabilityReceivedinfinalrevisedform24March2010andreliability,however,isanon-trivialissuethatstillneedstobeaddressedingreaterAvailableonline9April2010depth.Inthisstudy,severalcriteriaundertheca
4、tegoriesof‘uncoupleddamagecriterion’andthe‘coupleddamagecriterion’,includingthecontinuumdamagemechanics(CDM)-Keywords:basedLemaitremodelandtheGurson–Tvergaard–Needleman(GTN)model,areinvesti-Ductilefracturegatedtodeterminetheirreliabilityinductilefailureprediction.Tocreatediversestr
5、essFEsimulationandstrainstatesandfracturemodes,differentdeformationscenariosaregeneratedusingTensileandcompressiontestsPlasticdeformationtensileandcompressiontestsofAl-alloy6061(T6)withdifferentsamplegeometriesandFracturemechanismdimensions.Thetwocategoriesofcriteriaarecodedintofini
6、teelement(FE)modelsbasedontheunconditionalstressintegrationalgorithmintheVUMAT/ABAQUSplatform.Throughphysicalexperiments,computationsandthreeindustrialcasestudies,theentirecorrelationpanoramaoftheDFCs,deformationmodesandDFmechanismsisestablishedandarticu-lated.Theexperimentalandsim
7、ulationresultsshowthefollowing.(1)ThemixedDFmodeexistsineverydeformationofconcerninthisstudy,eveninthetensiletestoftheroundbarsamplewiththesmallestnotchradius.Adecreaseofstresstriaxiality(g-value)leadstoareductionintheaccuracyofDFpredictionbythetwoDFCcategoriesofDFCs,duetotheinterp
8、laybetweentheprincipalstre
