ABAQUS粘接单元应用.ppt
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ABAQUS粘接单元应用.ppt
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CohesiveBehavior,Lecture10,Overview,IntroductionCohesiveElementTechnologyConstitutiveResponseinCohesiveElementsViscousRegularizationforCohesiveElementsCohesiveElementExamplesSurface-basedCohesiveBehaviorElement-vs.Surface-basedCohesiveBehavior,Note:
Appendix2containsanin-depthdiscussionofmodelingtechniquesforcohesiveelementsusingboththeinteractiveandkeywordsinterfaces.,Introduction,Introduction,Cohesivebehaviorisusefulinmodelingadhesives,bondedinterfaces,andgaskets.ModelsseparationbetweentwoinitiallybondedsurfacesProgressivefailureofadhesivesDelaminationincompositesIdealizecomplexfracturemechanismswithamacroscopic“cohesivelaw,”whichrelatesthetractionacrosstheinterfacetotheseparation.Thecohesivebehaviorcanbe:
Element-basedModeledwithcohesiveelementsSurface-basedModeledwithcontactpairsinAbaqus/StandardandgeneralcontactinAbaqus/Explicit,Railcrush:
Cohesivesurfaces,T-peelanalysis:
Cohesiveelementsareusedformodelingadhesivepatches,Introduction,Element-basedcohesivebehaviorcohesiveelementsCohesiveelementsallowverydetailedmodelingofadhesiveconnections,includingspecificationofdetailedadhesivematerialproperties,directcontroloftheconnectionmesh,modelingofadhesivesoffinitethickness,etc.CohesiveelementsinAbaqusprimarilyaddresstwoclassesofproblems:
AdhesivejointsAdhesivelayerwithfinitethicknessTypicallythebulkmaterialpropertiesareknownDelaminationAdhesivelayerof“zero”thicknessTypicallythebulkmaterialpropertiesarenotknown,Introduction,Theconstitutivemodelingdependsontheclassofproblem:
Basedonmacroscopicproperties(stiffness,strength)foradhesivejointsContinuumdescription:
anyAbaqusmaterialmodelcanbeusedModelingtechniqueisrelativelystraightforward:
cohesivelayerhasfinitethickness;standardmaterialmodels(includingdamage).Thecontinuumdescriptionisnotdiscussedfurtherinthislecture.Basedonatraction-separationdescriptionfordelaminationLinearelasticitywithdamageModelingtechniqueislessstraightforward:
typicalapplicationsusezero-thicknesscohesiveelements;non-standardconstitutivelawThisapplicationistheprimaryfocusofthislecture,Introduction,Surface-basedcohesivebehaviorcohesivesurfacesThisisasimplifiedandeasywaytomodelcohesiveconnections,usingthetraction-separationinterfacebehavior.Itofferscapabilitiesthatareverysimilartocohesiveelementsmodeledwiththetraction-separationconstitutiveresponse.However,itdoesnotrequireelementdefinitions.Inaddition,cohesivesurfacescanbondanytimecontactisestablished(“sticky”contact)Itisprimarilyintendedforsituationsinwhichinterfacethicknessisnegligiblysmall.Itmustbedefinedasasurfaceinteractionproperty.Damageforcohesivesurfacesisaninteractionproperty,notamaterialproperty.Thekinematicsofcohesivesurfacesisdifferentfromthatofcohesiveelements.Bydefault,theinitialstiffnessoftheinterfaceiscomputedautomatically.,CohesiveElementTechnology,CohesiveElementTechnology,Elementtypes*3DelementsCOH3D8COH3D62DelementCOH2D4AxisymmetricelementCOHAX4Theseelementscanbeembeddedinamodelviasharednodesortieconstraints.,*Cohesiveporepressureelementsarealsoavailable.,CohesiveElementTechnology,Elementandsectiondefinition*ELEMENT,TYPE=COH3D8*COHESIVESECTION,ELSET=.,RESPONSE=TRACTIONSEPARATION,CONTINUUM,GASKET,THICKNESS=SPECIFIED,GEOMETRY,MATERIAL=.Specifythicknessindataline(defaultis1.0),CohesiveElementTechnology,DefaultthicknessofcohesiveelementsTraction-separationresponse:
UnitthicknessContinuumandgasketresponseGeometricthicknessbasedonnodalcoordinates,CohesiveElementTechnology,OutputvariablesScalardamage(i.e.,degradation)variableSDEGVariablesindicatingwhetherdamageinitiationcriteriametorexceededDiscussedshortlyElementstatusflagSTATUS,CohesiveElementTechnology,ImportofcohesiveelementsThecombinationofAbaqus/StandardandAbaqus/Explicitexpandstherangeofapplicationsforcohesiveelements.Forexample,youcansimulatethedamageinastructureduetoanimpacteventthenstudytheeffectofthedamageonthestructuresloadcarryingcapacity.,ConstitutiveResponseinCohesiveElements,ConstitutiveResponseinCohesiveElements,DelaminationapplicationsTractionseparationlawTypicallycharacterizedbypeakstrength(N)andfractureenergy(GTC)ModedependentLinearelasticitywithdamageAvailableinbothAbaqus/StandardandAbaqus/ExplicitModelingofdamageunderthegeneralframeworkintroducedearlierDamageinitiationTractionorseparation-basedcriterionDamageevolutionRemovalofelements,Typicaltraction-separationresponse,ConstitutiveResponseinCohesiveElements,LinearelasticitywithdamageLinearelasticityDefinesbehaviorbeforetheinitiationofdamageRelatesnominalstresstonominalstrainNominaltractiontoseparationwithdefaultchoiceofunitt
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