ANSYS_LS_DYNA_Users_Guide.pdf
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ANSYS_LS_DYNA_Users_Guide.pdf
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ANSYS/LS-DYNAUsersGuideTableofContents1Introduction1.1OverviewofStepsinanExplicitDynamicAnalysis1.2CommandsUsedinanExplicitDynamicAnalysis1.3AGuidetoUsingthisDocument1.4WheretoFindExplicitDynamicsExampleProblems1.5AdditionalInformation2Elements2.1SolidandShellElements2.1.1SOLID1642.1.2SHELL1632.1.3GeneralShellFormulations2.1.4MembraneElementFormulation2.1.5TriangularShellFormulations2.1.6PLANE1622.2BeamandLinkElements2.2.1BEAM1612.2.2LINK1602.2.3LINK1672.3DiscreteElements2.3.1COMBI165Spring-Damper2.3.2MASS1662.4GeneralElementCapabilities3Modeling3.1DefineElementTypesandRealConstants3.2SpecifyMaterialProperties3.3DefinetheModelGeometry3.4MeshtheModel3.5DefineContactSurfaces3.6GeneralModelingGuidelines3.7TheDefinitionofPART3.7.1PartAssemblies3.8AdaptiveMeshing4Loading4.1GeneralLoadingOptions4.1.1Components4.1.2ArrayParameters4.1.3ApplyingLoads4.1.4DataCurves4.1.5DefiningLoadsinaLocalCoordinateSystem4.1.6SpecifyingBirthandDeathTimes4.2ConstraintsandInitialConditions4.2.1Constraints4.2.2WeldsANSYS/LS-DYNAUsersGuidePrevNextPage1of180ANSYS/LS-DYNAUsersGuide20.05.2004file:
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Documents%20and%20SettingsAdministratorLocal%20SettingsTemphh.4.2.3InitialVelocity4.3CouplingandConstraintEquations4.4NonreflectingBoundaries4.5TemperatureLoading4.6DynamicRelaxation5SolutionFeatures5.1SolutionProcess5.2LS-DYNATerminationControls5.3SharedMemoryParallelProcessing5.4SolutionControlandMonitoring5.5PlottingSmallElements5.6EditingtheLS-DYNAInputFile5.6.1MethodA5.6.2MethodB5.6.3UsingaPre-existingFile.K6ContactSurfaces6.1ContactDefinitions6.1.1Listing,PlottingandDeletingContactEntities6.2ContactOptions6.2.1DefinitionofContactTypes6.2.2DefinitionofContactOptions6.3ContactSearchMethods6.3.1MeshConnectivityTracking6.3.2BucketSortMethod6.3.3LimitingtheContactSearchDomain6.4SpecialConsiderationsforShells6.5ControllingContactDepth6.6ContactStiffness6.6.1ChoiceofPenaltyFactor6.6.2SymmetryStiffness6.72-DContactOption7MaterialModels7.1DefiningExplicitDynamicsMaterialModels7.2ExplicitDynamicsMaterialModelDescriptions7.2.1LinearElasticModels7.2.2NonlinearElasticModels7.2.3NonlinearInelasticModels7.2.4PressureDependentPlasticityModels7.2.5FoamModels7.2.6EquationofStateModels7.2.7DiscreteElementModels7.2.8RigidModel8RigidBodies8.1SpecifyingInertiaProperties8.2Loading8.3SwitchingPartsfromDeformabletoRigid8.4NodalRigidBodies9Hourglassing10MassScaling11Subcycling12Postprocessing12.1OutputControls12.1.1Results(Jobname.RST)vs.History(Jobname.HIS)Files12.1.2CreatingComponentsforPOST2612.1.3WritingtheOutputFilesforPOST26Page2of180ANSYS/LS-DYNAUsersGuide20.05.2004file:
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Documents%20and%20SettingsAdministratorLocal%20SettingsTemphh.12.2UsingPOST1withANSYS/LS-DYNA12.2.1AnimatingResults12.2.2ElementOutputData12.2.3PostprocessingafterAdaptiveMeshing12.3UsingPOST26withANSYS/LS-DYNA12.3.1NodalandElementSolutions12.3.2ReadingASCIIFilesforMiscellaneousOutputData12.3.3DataSmoothing12.4FindingAdditionalInformation13Restarting13.1TheRestartDumpFile13.2TheEDSTARTCommand13.2.1ANewAnalysis13.2.2ASimpleRestart13.2.3ASmallRestart13.2.4AFullRestart13.3EffectonOutputFiles14Explicit-to-ImplicitSequentialSolution14.1Explicit-to-ImplicitSequentialSolution14.2TroubleshootingaSpringbackAnalysis14.2.1SpringbackStabilization15Implicit-to-ExplicitSequentialSolution15.1StructuralImplicit-to-ExplicitSolutionforPreload15.1.1SpecialConsiderationsforThermalLoading15.2ThermalImplicit-to-ExplicitSolution16DropTestModule16.1Introduction16.2StartingANSYSWiththeDropTestModule16.3TypicalDropTestProcedure16.3.1BasicDropTestAnalysisProcedure16.3.2ScreenCoordinatesDefinition16.3.3AdditionalNotesontheUseoftheDTM16.4AdvancedDTMFeatures16.4.1ObjectInitialVelocity16.4.2ModifyingtheTarget16.5DropTestSet-upDialogBox16.5.1UsingtheDropTestSet-upDialogBox16.5.2BasicTaboftheDropTestSet-upDialogBox16.5.3VelocityTaboftheDropTestSet-upDialogBox16.5.4TargetTaboftheDropTestSet-upDialogBox16.5.5StatusTaboftheDropTestSet-upDialogBox16.6PickingNodes16.7Postprocessing-Animation16.8Postprocessing-GraphandListTime-HistoryVariablesAComparisonofImplicitandExplicitMethodsA.1TimeIntegrationA.1.1ImplicitTimeIntegrationA.1.2ExplicitTimeIntegrationA.2StabilityLimitA.2.1ImplicitMethodA.2.2ExplicitMethodA.3CriticalTimeStepSizeofaRodA.4ANSYS/LS-DYNATimeStepSizeBMaterialModelExamplesB.1ANSYS/LS-DYNAMaterialModelsPage3of180ANSYS/LS-DYNAUsersGuide20.05.2004file:
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Documents%20and%20SettingsAdministratorLocal%20SettingsTemphh.B.2MaterialModelExamplesB.2.1IsotropicElasticExample:
HighCarbonSteelB.2.2OrthotropicElasticExample:
AluminumOxideB.2.3AnisotropicElasticExample:
CadmiumB.2.4Blatz-KoExample:
RubberB.2.5Mooney-RivlinExample:
RubberB.2.6ViscoelasticExample:
GlassB.2.7BilinearIsotropicPlasticityExample:
NickelAlloyB.2.8TransverselyAnisotropicElasticPlasticExample:
1010SteelB.2.9TransverselyAnisotropicFLDExample:
StainlessSteelB.2.10BilinearKinematicPlasticityExample:
TitaniumAlloyB.2.11PlasticKinematicExample:
1018SteelB.2.123ParameterBarlatExample:
Aluminum5182B.2.13BarlatAnisotropicPlasticityExample:
2008-T4AluminumB.2.14RateSensitivePowerlawPlasticityExample:
A356AluminumB.2.15StrainRateDependentPlasticityExample:
4140SteelB.2.16PiecewiseLinearPlasticityExample:
HighCarbonSteelB.2.17PowerlawPlasticityExample:
Aluminum1100B.2.18GeologicalCapExample:
SRIDynamicConcreteB.2.19Johnson-CookLinearPolynomialEOSExample:
1006SteelB.2.20Johnson-CookGruneisenEOSExample:
OFHCCopperB.2.21NullMaterialLinearPolynomialEOSExample:
BrassB.2.22NullMaterialGruneisenEOSExample:
AluminumB.2.23SteinbergGruneisenEOSExample:
StainlessSteelB.2.24CableMaterialExample:
SteelB.2.25RigidMaterialExample:
SteelCANSYS/LS-DYNAtoLS-DYNACommandMappingBibliographyChapter1.IntroductionANSYS/LS-DYNAcombinestheLS-DYNAexplicitfiniteelementprogramwiththepowerfulpre-andpostprocessingcapabilitiesoftheANSYSprogram.TheexplicitmethodofsolutionusedbyLS-DYNAprovidesfastsolutionsforshort-time,largedeformationdynamics,quasi-staticproblemswithlargedeformationsandmultiplenonlinearites,andcomplexcontact/impactproblems.Usingthisintegratedproduct,youcanmodelyourstructureinANSYS,obtaintheexplicitdynamicsolutionviaLS-DYNA,andreviewresultsusingthestandardANSYSpostprocessingtools.YoucanalsotransfergeometryandresultsinformationbetweenANSYSandANSYS/LS-DYNAtoperformsequentialimplicit-explicit/explicit-implicitanalyses,suchasthoserequiredfordroptest,springbackandotherapplications.1.1.OverviewofStepsinanExplicitDynamicAnalysisPrevNextExampleofa2DRadiationAnalysisUsingtheRadiosityMethod(CommandMethod)IntroductionIntroductionPrevANSYS/LS-DYNAUsersGuideNextPage4of180ANSYS/LS-DYNAUsersGuide20.05.2004file:
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Documents%20and%20SettingsAdministratorLocal%20SettingsTemphh.TheprocedureforanexplicitdynamicanalysisissimilartoanyotheranalysisthatisavailableintheANSYSprogram.Thethreemainstepsare:
1.Buildthemodel(withthePREP7preprocessor)2.Applyloadsandobtainthesolution(withtheSOLUTIONprocessor)3.Reviewtheresults(withthePOST1andPOST26postprocessors)ThisdocumentdescribesproceduresandconceptsthatareuniquetoanexplicitdynamicanalysisperformedusingtheANSYS/LS-DYNAproduct.Itdoesnotdescribealldetailsofthethreestepslistedabove.IfyouarefamiliarwiththeANSYSprogram,youalreadyknowhowtoperformthesesteps,andthisdocumentwillprovideadditionalinformationyouneedtoperformanexplicitdynamicanalysis.IfyouhavenotusedANSYSbefore,youshouldreviewthefollowingtwomanuals(inadditiontothisdocument)tolearnthebasicanalysisprocedures:
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ANSYSBasicAnalysisGuide?
ANSYSModelingandMeshingGuideWhenusingANSYS/LS-DYNA,itisrecommendedthatyouusethedefaultsettingsprovidedbytheprogram.Manytimes,thesesettingsareappropriateforsolvingtheproblems.1.2.CommandsUsedinanExplicitDynamicAnalysisYouusethesamesetofcommandstobuildamodelandperformanexplicitdynamicanalysisthatyouusetodoanyothertypeofANSYSanalysis.Likewise,youchoosesimilaroptionsfromtheANSYSprogramsgraphicaluserinterface(GUI)tobuildandsolvemodels.However,somecommandsareuniquetoanexplicitdynamicanalysis.Thesecommandsare:
PrevNextANSYS/LS-DYNAUsersGuideCommandsUsedinanExplicitDynamicAnalysisCommandsUsedinanExplicitDynamicAnalysisPrevIntroductionNextEDADAPTActivatesadaptivemeshingEDASMPCreatesapartassemblyEDBOUNDDefinesaboundaryplaneforslidingorcyclicsymmetryEDBVISSpecifiesbulkviscositycoefficientsEDBXCreatesaboxshapedvolumetobeusedinacontactdefinitionEDCADAPTSpecifiesadaptivemeshingcontrolsEDCGENSpecifiescontactparametersEDCLISTListscontactentityspecificationsEDCMORESpecifiesadditionalcontactparametersforagivencontactdefinitionEDCNSTRDefinesvarioustypesofconstraintsEDCONTACTSpecifiescontactsurfacecontrolsPage5of180ANSYS/LS-DYNAUsersGuide20.05.2004file:
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Documents%20and%20SettingsAdministratorLocal%20SettingsTemphh.EDCPUSpecifiesCPUtimelimitEDCRBMergestworigidbodiesEDCSCSpecifieswhethersubcyclingwillbeusedEDCTSSpecifiesmassscalingEDCURVESpecifiesdatacurvesEDDAMPDefinessystemdampingEDDCDeletesordeact
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