FRAC-L04-Damage

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1、MaterialFailureandWearLecture4L4.2Overview•ProgressiveDamageandFailure•DamageInitiationforDuctileMetals•DamageEvolution•ElementRemoval•DamageinFiber-ReinforcedCompositeMaterials•FailureinFasteners•MaterialWearandAblationModelingFractureandFailurewithAbaqusProgressiveDamageandFailureL4.4ProgressiveD

2、amageandFailure•Abaqusoffersageneralcapabilityformodelingprogressivedamageandfailureinengineeringstructures•Materialfailurereferstothecompletelossofloadcarryingcapacitythatresultsfromprogressivedegradationofthematerialstiffness.•Stiffnessdegradationismodeledusingdamagemechanics.•Progressivedamagean

3、dfailurecanbemodeledfor:•Ductilematerials•Continuumconstitutivebehavior•Fiber-reinforcedcomposites•Interfacematerials•Cohesiveelementswithatraction-separationlaw•Damageandfailureofcohesiveelementsarediscussedinthenextlecture.ModelingFractureandFailurewithAbaqusL4.5ProgressiveDamageandFailure•Twodis

4、tincttypesofductilematerialfailurecanbemodeledwithAbaqus•Ductilefractureofmetals•Voidnucleation,coalescence,andgrowth•Shearbandlocalization•Neckinginstabilityinsheet-metalforming•FormingLimitDiagrams•Marciniak-Kuczynski(M-K)criterion•Damageinsheetmetalsisnotdiscussedfurtherinthisseminar.ModelingFra

5、ctureandFailurewithAbaqusL4.6ProgressiveDamageandFailure•ComponentsofmaterialdefinitionUndamagedresponse•Undamagedconstitutivebehavior(e.g.,elastic-plasticAwithhardening)Damagedresponse•Damageinitiation(pointA)•Damageevolution(pathA–B)•Choiceofelementremoval(pointB)Keywords*MATERIALB*ELASTICMultip

6、ledamagedefinitionsareallowed*PLASTICTypicalmaterialresponseshowing*DAMAGEINITIATION,CRITERION=criterionprogressivedamage*DAMAGEEVOLUTION*SECTIONCONTROLS,ELEMENTDELETION=YESModelingFractureandFailurewithAbaqusDamageInitiationCriteriaforDuctileMetalsL4.8DamageInitiationCriteriaforDuctileMetals•Dama

7、geinitiationdefinesthepointofinitiationofdegradationofstiffness•Itisbasedonuser-specifiedcriteria•Ductileorshear•Itdoesnotactuallyleadtodamageunlessdamageevolutionisalsospecified•Outputvariablesassociatedwi