ABAQUS粘接单元应用.ppt

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1、CohesiveBehaviorLecture10OverviewIntroductionCohesiveElementTechnologyConstitutiveResponseinCohesiveElementsViscousRegularizationforCohesiveElementsCohesiveElementExamplesSurface-basedCohesiveBehaviorElement-vs.Surface-basedCohesiveBehaviorNote:Appendix2containsa

2、nin-depthdiscussionofmodelingtechniquesforcohesiveelementsusingboththeinteractiveandkeywordsinterfaces.IntroductionIntroductionCohesivebehaviorisusefulinmodelingadhesives,bondedinterfaces,andgaskets.ModelsseparationbetweentwoinitiallybondedsurfacesProgressivefail

3、ureofadhesivesDelaminationincompositesIdealizecomplexfracturemechanismswithamacroscopic“cohesivelaw,”whichrelatesthetractionacrosstheinterfacetotheseparation.Thecohesivebehaviorcanbe:Element-basedModeledwithcohesiveelementsSurface-basedModeledwithcontactpairsinAb

4、aqus/StandardandgeneralcontactinAbaqus/ExplicitRailcrush:CohesivesurfacesFailedadhesiveisred(CSDMG=1)T-peelanalysis:CohesiveelementsareusedformodelingadhesivepatchesIntroductionElement-basedcohesivebehavior—cohesiveelementsCohesiveelementsallowverydetailedmodeli

5、ngofadhesiveconnections,includingspecificationofdetailedadhesivematerialproperties,directcontroloftheconnectionmesh,modelingofadhesivesoffinitethickness,etc.CohesiveelementsinAbaqusprimarilyaddresstwoclassesofproblems:AdhesivejointsAdhesivelayerwithfinitethicknes

6、sTypicallythebulkmaterialpropertiesareknownDelaminationAdhesivelayerof“zero”thicknessTypicallythebulkmaterialpropertiesarenotknownIntroductionTheconstitutivemodelingdependsontheclassofproblem:Basedonmacroscopicproperties(stiffness,strength)foradhesivejointsContin

7、uumdescription:anyAbaqusmaterialmodelcanbeusedModelingtechniqueisrelativelystraightforward:cohesivelayerhasfinitethickness;standardmaterialmodels(includingdamage).Thecontinuumdescriptionisnotdiscussedfurtherinthislecture.Basedonatraction-separationdescriptionford

8、elaminationLinearelasticitywithdamageModelingtechniqueislessstraightforward:typicalapplicationsusezero-thicknesscohesiveelements;non-standardconstitutivelawThi