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1、JournalofMaterialsProcessingTechnology177(2006)278281FiniteelementpredictionofductilefractureinsheetmetalformingprocessesPedroTeixeirab,A.D.Santosa,∗,F.M.AndradePiresa,J.M.A.CesardeS´a´aaFEUP-DEMEGI–Fac.EngineeringUniversityofPorto,Dep.Mech.Eng.Ind.Management,R.Dr.RobertoFrias
2、s/n,4200-465Porto,PortugalbINEGI–InstituteofMechanicalEngineeringandIndustrialManagement,R.Barroco174,4465-591Le¸cadoBalio,PortugalAbstractInthiscontribution,LemaitresductiledamagemodeliscoupledwithHillsorthotropicplasticitycriterion.Thecouplingbetweendamagingandmaterialbehavi
3、ourisaccountedforwithintheframeworkofContinuumDamageMechanics(CDM).TheresultingconstitutiveequationsareimplementedintheAbaqus/Explicitcode,forthepredictionoffractureonsetinsheetmetalformingprocesses.Thedamageevolutionlawtakesintoaccounttheimportanteffectofmicro-crackclosure,wh
4、ichdramaticallydecreasestherateofdamagegrowthundercompressivepaths.©2006ElsevierB.V.Allrightsreserved.Keywords:Finiteelements;Damage;Sheetforming;Anisotropy1.Introductioncalphenomenonandplayasignificantroleinthestudyoftheformabilityandfractureonsetinsheetmetalformingprocesses.T
5、hegreatmajorityofsheetmetalformingprocessesinvolvesHere,LemaitresductiledamageevolutionlawiscoupledwithfiniteinelasticstrainsthatarerestrictedbygeometricinstabilitiesHillsorthotropicplasticitycriterion.Theresultingconstitutiveduetoneckingandstrainlocalization.Therefore,theabili
6、tytoequationsareimplementedandassessedforthepredictionofpredicttheformabilitylimitisofparamountimportanceinorderfractureonsetinsheetmetalformingprocesses.toavoidtheseunwantedphenomena,optimizetheprocess,studytheinfluenceofeachparameterontheneckingoccurrenceand2.Constitutivemode
7、llingsubsequentlyimprovethepressperformance.Althoughform-inglimitdiagrams,associatedwithfiniteelementsimulations,Theaccuratepredictionofamacro-crackinitiationisstillaarecurrentlyperformedbypowerfulcommercialcodes,whenlargelyopenquestion.Duetothecomplexinteractionbetweencomplexs
8、trainpathsareinvolvedthesepredictionsoftenfailtovariousphenom
