ABAQUS粘接单元应用PPT格式课件下载.ppt

ABAQUS粘接单元应用PPT格式课件下载.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