ABAQUS connector用法

Copyright2006ABAQUS,Inc.ConnectionElementsandConnectionLibraryLecture2FlexibleMultibodySystemswithABAQUSL2.2Copyright2006ABAQUS,Inc.Overview•Introduction•DefiningConnectorElements•UnderstandingConnectorSections•UnderstandingConnectionTypes•UnderstandingConnectorLocalDirections•RotationalDegreesofFreedomatNodes•ComponentsofRelativeMotion•ConnectorLocalKinematics•SummaryofOrientationsandLocalDirectionsCopyright2006ABAQUS,Inc.IntroductionFlexibleMultibodySystemswithABAQUSL2.4Copyright2006ABAQUS,Inc.Introduction•Generalcharacteristicsofconnectorelements•Connectorelementsmodeldiscrete(point-to-point)physicalconnectionsbetweendeformableorrigidbodiesorcanbeconnectedtoground.•Example:typicalconnectionsinautomotivesuspensionsystemsTypicalconnectionsinautomotivesuspensionRackandpinionControlarmTierodKnuckleStrutJOINCYLINDRICALAXIALCYLINDRICALLINKFlexibleMultibodySystemswithABAQUSL2.5Copyright2006ABAQUS,Inc.Introduction•Connectorelementshaverelativedisplacementsandrotationsthatarelocaltotheelement,whicharereferredtoascomponentsofrelativemotions(CORM).•Connectorelementsimposekinematicconstraints.Forexample:•Doorconnectedtoaframethroughahinge•Twopanelsofsheetmetalspotweldedtogether•Constantvelocityjoints•Connectorelementsmayinclude(nonlinear)force-versus-displacement(orvelocity)behaviorintheiravailablecomponentsofrelativemotion.•Example:muscleforceresistingtherotationofakneejointinacrash-testoccupantdummymodel.•Connectorelementscanprovidecomprehensivekinematicandkineticoutputdescribingtheconnection.FlexibleMultibodySystemswithABAQUSL2.6Copyright2006ABAQUS,Inc.Introduction•Connectorelementsarefunctionallydefinedbyspecifyingtheconnectionattributes.•Connectiontypes•Forexample:axial,hinge,weld,constantvelocityjoints,link,beam,etc.•Localconnectordirections•Connectorbehaviors•Uncoupledorcoupledresponse•Linearornonlinearresponse•Elasticityanddamping•Plasticity•Friction•DamageandFailure•StopsandlocksAXIALconnectioninashockabsorbingstrutusesavarietyofconnectionbehaviors,includingspring,dampingandstopbehaviorsAXIALCopyright2006ABAQUS,Inc.DefiningConnectorElementsFlexibleMultibodySystemswithABAQUSL2.8Copyright2006ABAQUS,Inc.DefiningConnectorElements•Connectorelementsare2-nodeelements.•Elementtype:•CONN2D2•Two-dimensionalanalysis•Axisymmetricanalysis•CONN3D2•Three-dimensionalanalysis•Bothtypesofelementhaveatmosttwonodes.•Theposition(location,orientation)andmotion(displacement,velocity,acceleration)ofthesecondnodeontheelementaremeasuredrelativetothefirstnode.FlexibleMultibodySystemswithABAQUSL2.9Copyright2006ABAQUS,Inc.DefiningConnectorElements•Definingaconnectorelement–Keywordsinterface•Toconnecttwopoints:*ELEMENT,TYPE=[CONN2D2orCONN3D2]elementnumber,firstnodenumber,secondnodenumber•Example:Shockabsorber*ELEMENT,TYPE=CONN3D2101,11,12Simplifiedconnectormodelofashockabsorberab1FlexibleMultibodySystemswithABAQUSL2.10Copyright2006ABAQUS,Inc.DefiningConnectorElements•Toconnectapointtoground:•Theground“node”canbethefirstorsecondnodeontheconnectorelement.*ELEMENT,TYPE=nameelementnumber,,nodenumberonthebodyor*ELEMENT,TYPE=nameelementnumber,nodenumberonthebody•Thegroundnodeisfixed.2FlexibleMultibodySystemswithABAQUSL2.11Copyright2006ABAQUS,Inc.DefiningConnectorElements•Definingconnectorgeometry–ABAQUS/CAEinterface•Createassembly-levelwirefeaturestodefineconnectorgeometryintheInteractionmodule.•disjointwires•chainedwires•wirestoground.•ClickAddtoaddpoints•Tip:twocoincidentpointscanbeselectedsimultaneouslybydouble-clickingonthelocationofthepoints•ClickDeletetodeletetheselectedpointpair.•ClickSwaptoswapthepointsoftheselectedpointpair.•Tip:thepointpairneedstobeselectedbyclickitsindexnumber.FlexibleMultibodySystemswithABAQUSL2.12Copyright2006ABAQUS,Inc.DefiningConnectorElements•Ageometrysetincludingallofthewirescanbecreatedwhencreatingthewirefeature.•Thesetcanbeusedduringthesubsequentselectionprocedures.•Forexample,youcanusesetstoassignconnectorsections,requestoutput,orprescribemotions.•Note:Multiplesetscanbemergedintoanewsetusingthesetmergefeature.•Assembly-levelwirefeaturescannotbemodifieddirectlyoncecreated.•WirescanberemovedbyselectingRemoveWiresFromFeature.FlexibleMultibodySystemswithABAQUSL2.13Copyright2006ABAQUS,Inc.DefiningConnectorElements•Example:Truckdoorhinges•Inthisexample,hingeconnectorsconnectatruckdoortothetruckbody.ABAQUS/CAEinterfaceCreatewiregeometryKeywordsinterfaceDefineaconnectorelement*ELEMENT,TYPE=CONN3D2,ELSET=CONN_DOOR_HINGE620601,9000009,9000010620602,9000011,9000012...2nodesperelementRP-2node9000010HINGEconnectorsatdoorhingesCopyright2006ABAQUS,Inc.UnderstandingConnectorSectionsFlexibleMultibodySystemswithABAQUSL2.15Copyright2006ABAQUS,Inc.UnderstandingConnectorSections•Connectorsectiondefines:•Theconnectiontype.•Thelocaldirectionsassociatedwiththeconnector’snodes•Theconnectorbehaviors.•Note:Detailsofconnectorbehaviorwillbediscussedinlectures4and5.•Creatingaconnectorsection*CONNECTORSECTION,ELSET=nameABAQUS/CAEinterfaceKeywordsinterfaceFlexibleMultibodySystemswithABAQUSL2.16Copyright2006ABAQUS,Inc.UnderstandingConnect