AbaqusCAECONTWK01QSeal.docx
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AbaqusCAECONTWK01QSeal.docx
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AbaqusCAECONTWK01QSeal
Note:
ThisworkshopprovidesinstructionsintermsoftheAbaqusKeywordsinterface.IfyouwishtousetheAbaqusGUIinterfaceinstead,pleaseseethe“Interactive”versionoftheseinstructions.
PleasecompleteeithertheKeywordsorInteractiveversionofthisworkshop.
Goals
∙Evaluateahyperelasticmaterial.
∙Definecontactinteractionsusingcontactpairsandgeneralcontact.
∙PerformalargedisplacementanalysiswithAbaqus/Standard.
∙UseAbaqus/Viewertocreateacompressionload-deflectioncurve.
Introduction
Inthisworkshop,acompressionanalysisofarubbersealisperformedtodeterminetheseal’sperformance.Thegoalistodeterminetheseal’scompressionload-deflection(CLD)curve,deformationandstresses.TheanalysiswillbeperformedusingAbaqus/Standard.Twoanalysesareperformed:
oneusingcontactpairsandtheotherusinggeneralcontact.
AsshowninFigureW1–1,thetopoutersurfaceofthesealiscoveredwithapolymerlayer,andthesealiscompressedbetweentworigidsurfaces(theupperoneisdisplacedalongthenegative2-direction;theloweroneisfixed).Duringcompression,thecovercontactsthetoprigidsurface;theoutersurfaceofthesealisincontactwiththecoverandthebottomrigidsurface;inadditiontheinnersurfaceofthesealmaycomeintocontactwithitself.
FigureW1–1.Sealmodel
Sealanalysis
1.Changetothe../contact/keywords/sealdirectory.
2.Opentheinputfilew_seal.inp,whichalreadycontainsthenodes,elements,andmaterialmodeldatafortheanalysis.YouwillfirstuseAbaqus/CAEfunctionalitytoevaluatethestabilityofthehyperelasticmaterialmodelandthenedittheinputfiletoincludethecontact,stepandboundaryconditiondefinitions.
MaterialEvaluation
Itisimportanttodeterminewhetherthematerialmodelofthesealwillbestableduringtheanalysis.Beforecompletingtheinputfile,evaluatethematerialdefinitionthatisusedfortheseal.
1.Useyourtexteditortoreviewthesuppliedworkshopmodelcontainedinthefilew_seal.inp.
2.ThematerialnamedSANTOPRENEisusedfortheseal.Locatethe*MATERIAL,NAME=SANTOPRENEoption.Itisahyperelasticmaterialwithafirstorderpolynomialstrainenergypotential.Thecoefficientsarealreadyspecifiedfortheanalysis.
3.Evaluatethematerialdefinition.Abaqus/CAEprovidesaconvenientEvaluateoptionthatallowsyoutoviewthebehaviorpredictedbyahyperelasticmaterialbyperformingstandardteststochooseasuitablematerialformulation.YouwillusethisoptiontoviewthebehaviorpredictedbythematerialSANTOPRENE.
a.StartasessionofAQUS/CAEusingthefollowingcommandatthecommandprompt:
abaquscae
IntheStartSessiondialogbox,selectCreateModelDatabase.
b.IntheModelTree,double-clicktheMaterialscontainertocreateamaterialdefinitionasspecifiedintheinputfile.IntheEditMaterialdialogbox,namethematerialSantoprene;fromthemenubar,selectMechanical→Elasticity→Hyperelastic;intheHyperelasticfield,selectthePolynomialstrainenergypotentialandtheCoefficientsinputsource,acceptastrainenergypotentialorderof1,andenterthevaluesofthecoefficients(definedintheinputfile)asshowninFigureW1–2.ClickOKtosavethematerialdefinitionandexitthematerialeditor.
FigureW1–2.Materialeditor
c.FromthemainmenubarinthePropertymodule,selectMaterial→Evaluate→Santoprene.
d.TheEvaluateMaterialdialogboxappears.NoticethatyoucanchooseeithertheCoefficientsorTestdatasourceforevaluatingthematerial.Typicallythetestdataareusedtodefineamaterialmodel;youcanusetheEvaluateoptiontoviewthepredictedbehaviorandadjustthematerialdefinitionasnecessary.Inthisworkshopyouwillonlyevaluatethestabilityofthematerialmodelforthegivencoefficients.
e.IntheEvaluateMaterialdialogbox,acceptalldefaultsandclickOK.Abaqus/CAEcreatesandsubmitsajobtoperformthestandardtestsusingthematerialSantoprene;atthesametime,Abaqus/CAEswitchestotheVisualizationmoduleanddisplaystheevaluationresultswhenthejobiscomplete.FigureW1–3showstheMaterialParametersandStabilityLimitInformationdialogbox;FigureW1–4showsthreestressvs.strainplotsfromuniaxial,biaxial,andplanartests.
QuestionW1–1:
Whatdotheplotsindicateaboutthestabilityofthematerial?
Basedontheseresults,youcanhaveconfidencethatyourmaterialwillremainstable.
FigureW1–3.Materialparametersandstabilitylimitinformation
FigureW1–4.Materialevaluationresultsforuniaxial,biaxial,andplanartests
Afterevaluatingthematerial,youcanexitAbaqus/CAEandwillnowcompletethemodeldefinition.
Part1:
Analysisusingcontactpairs
Contactinteractions
4.Opentheinputfilew_seal.inpinatexteditor.
5.DefinecontactpairsaslistedinTableW1–1.ThesurfaceswhichwillbeusedinthecontactpairdefinitionsareshowninFigureW1–5.Therequiredoptionis:
*CONTACTPAIR,INTERACTION=frictionless,ADJUST=0.001
Cover,SealOuter
Cover,Top
SealOuter,Bottom
Notethattheinteractionpropertynamedfrictionlesshasalreadybeendefinedintheinputfile.Locatethe*SURFACEINTERACTION,NAME=frictionlessoptiontoreviewitsdefinition.
TableW1–1.Contactpairs
SlaveSurface
MasterSurface
Cover
SealOuter
Cover
Top
SealOuter
Bottom
FigureW1–5.Contactsurfaces
6.Defineaself-contactdefinitionfortheinnersurfaceoftheseal:
*CONTACTPAIR,INTERACTION=frictionless
SealInner,
QuestionW1–2:
Intheinteractionbetweenthesealandthecover,whydowechooseSealOuterasthemastersurface?
Stepdefinition
7.Defineageneralstaticstepconsideringgeometricnonlinearity.Settheinitialtimeincrementsizeto0.5%ofthetotaltimeperiod.Thefollowingoptiondefinestheprocedure:
*STEP,NLGEOM=YES
*STATIC
0.005,1.
Boundaryconditionsandhistoryoutputrequests
8.AsymmetriclateralslidingofthemodelispreventedbyconstrainingthesealandthecoveralongtheirverticalsymmetryaxesintheX-direction.Thebottomrigidsurfaceisfixed,andadisplacementof–6unitsisappliedtothetoprigidsurfacealongtheY-directiontocompressthesealbetweenthetwosurfaces.ThenodesetsonwhichtheboundaryconditionswillbedefinedareshowninFigureW1–6.Thefollowingoptioncompletestheseboundaryconditions:
*BOUNDARY
Fix1,1,1
BotRP,ENCASTRE
TopRP,1,1
TopRP,2,2,-6.
TopRP,6,6
FigureW1–6:
NodeSets
9.ThepreselecteddefaultfieldoutputdoesnotincludethenominalstrainNE;tovisualizethenominalstraininAbaqus/Viewer,youwillwriteadditionalfieldoutputtotheoutputdatabasefile.Locatethe
*OUTPUT,FIELD,VARIABLE=PRESELECToptionandadd
thefollowingsub-option:
*ELEMENTOUTPUT
NE,
10.AddahistoryoutputrequesttowritethehistoryofRF2andU2forthesetTopRPtotheoutputdatabasefile.Therequiredoptionis:
*OUTPUT,HISTORY
*NODEOUTPUT,NSET=TopRP
RF2,U2
11.Saveallthechangesandclosetheinputfile.
Runningthejobandvisualizingtheresults:
Runtheanalysisusingthefollowingcommand:
abaqusjob=w_seal
Whenthejobiscomplete,usethefollowingproceduretovisualizetheresultsusingAbaqus/Viewer:
12.StartAbaqus/Viewerandopenthefilew_seal.odb:
abaqusviewerodb=w_seal.odb
13.Plottheundeformedandthedeformedmodelshapes.Todistinguishbetweenthedifferentparts,colorcodethemodelbasedonsectionassignments.
Tip:
Fromthetoolbar,selectSectionsfromthecolor-codingpulldownmenu,asshowninFigureW1–7(orusetheColorCodeDialogtool
tocustomizethecolorforeachsection).
FigureW1–7.Color-codingpulldownmenu
14.UsetheAnimate:
TimeHistorytool
toanimatethedeformationhistory.
15.Displayonlytheseal.IntheResultsTree,expandtheInstancescontainerunderneaththeoutputdatabasefilenamedseal.odb.Clickmousebutton3ontheinstanceSEAL-1andselectReplacefromthemenuthatappears.
Abaqus/CAEnowdisplaysonlytheelementsassociatedwiththeseal.
16.ContourtheMisesstressofthesealonthedeformedshape.Ifnecessary,usetheframeselector
inthecontextbartoselectthelastincrement.
ThecontourplotisshowninFigureW1–8.
FigureW1–8.Misescontourplot
17.Contourtheminimumandmaximumprincipalnominalstrains.Elasticstrainscanbeveryhighforhyperelasticmaterials.Becauseofthis,thelinearelasticmaterialmodelisnotusedbecauseitisnotappropriateforelasticstrainsgreaterthanapproximately5%.
18.Contourthecontactpressures.Notethatthemeshobscuresthecontoursintheregionofself-contact;thus,alsoextrudethemesh.Usedisplaygroupsasindicatedbelowtomakethemeshtranslucent:
a.Createacontourplotofthecontactpressure(intheFieldOutputtoolbar,selectPrimaryfromthelistofvariabletypesontheleftsideofthetoolbarandCPRESSfromthelistofoutputvariablesinthecenter).
b.Fromthemainmenubar,selectView→ODBDisplayOptions.Inthedialogboxthatappears,switchtotheSweep/ExtrudetabbedpageandtoggleonExtrudeelements.AcceptthedefaultdepthandclickOK.
c.UsetheCommonPlotOptionsdialogboxtosetthedeformationscalefactorto0.96(thiswillfurtheraidvisualization).
d.Inthetoolbar,clicktheCreateDisplayGrouptool
.
e.IntheCreateDisplayGroupdialogbox,clickSaveAsatthebottomofthedialogbox.Namethedisplaygroupmesh.
f.IntheCreateDisplayGroupdialogbox,selectSurfacesastheitem.
g.SelectSEALINNERandSEALOUTER.ClickReplaceandthenSaveAsatthebottomofthedialogbox.Namethedisplaygroupsurfaces.
h.Dismissthedialogbox.
i.Inthetoolbar,clicktheDis
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