AbaqusCAECONTW05QInterfFit.docx

AbaqusCAECONTW05QInterfFit.docx

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AbaqusCAECONTW05QInterfFit

Note:

ThisworkshopprovidesinstructionsonusingcontactinteractionsintermsoftheAbaqusGUIinterface.IfyouwishtousetheAbaqusKeywordsinterfaceinstead,pleaseseethe“Keywords”versionoftheseinstructions.

PleasecompleteeithertheKeywordsorInteractiveversionofthisworkshop.

Introduction

Thisworkshopsimulatestheinterferencefitoftwocircularrings.ThemodelisshowninFigureW5–1.BothringsareassumedlinearelasticandaremodeledwithCPE4elements.Frictionlesscontactisassumed.Theinnerringisoverclosedrelativetotheouterringbyaconstantradialdistanceof0.05units.Threeanalysesareperformed.Theydifferinhowthesurfaceadjustmentsareappliedandwhethersurfacesmoothingisemployed.

FigureW5–1.Modelundeformedconfiguration

Preliminaries

1.Entertheworkingdirectoryforthisworkshop

../contact/interactive/interference

2.Runthescriptws_contact_interf.pyusingthefollowingcommand:

abaquscaestartup=ws_contact_interf.py.

TheabovecommandcreatesanAbaqus/CAEdatabasenamedcirc-rings.caeinthecurrentdirectory.Thegeometry,mesh,andmaterialdefinitionsareincludedinthemodel.Youwilladdthenecessarydatatocompletethemodel,runthejob,andfinallypostprocesstheresults.

ConfiguringtheAnalysis

Theanalysisconsistsoftwogeneralstaticsteps.Thestepswillconsidergeometricnonlinearity.Inthefirststeptheinterferencefitwillberesolved;inthesecondstep,theinnerringwillberotated360ºwhiletheouterringremainsfixed.

Tocreategeneral,staticanalysissteps:

1.IntheModelTree,double-clickSteps.

2.IntheCreateStepdialogbox:

a.Fromthelistofavailablegeneralprocedures,selectStatic,Generalifitisnotalreadyselected,andclickContinue.

3.IntheEditStepdialogbox:

a.IntheBasictabbedpage,toggleonNlgeom.

b.Enterthefollowingdescription:

resolveinterferencefit.

c.SwitchtotheOthertabbedpageandchoosetheUnsymmetricmatrixstoragescheme.（Theunsymmetricsolverisrecommendedforgeneralcontact.）

d.ClickOKtocreatethestep.

4.Createasecondgeneralanalysisstep:

a.Enterthefollowingdescription:

rotateinnerring.

b.SwitchtotheIncrementationtabbedpageandsettheinitialincrementsizeto0.05.

c.ClickOKtocreatethestep.

Definingcontactproperties

Frictionlesscontactisassumedbetweentheparts.Usethepenaltyconstraintenforcementmethodwiththedefaultpenaltystiffness.

5.IntheModelTree,double-clickInteractionProperties.

a.NamethepropertynoFricandselectContactasthepropertytype.

b.Inthecontactpropertyeditor,selectMechanical→NormalBehavior.

c.SelectPenaltyastheconstraintenforcementmethod.

Part1:

Analysiswithsurfacesmoothing

Thefirstanalysisinthisexerciseconsiderstheeffectsofsurfacesmoothingonthesolution.Heregeneralcontactwillbeusedwithanon-defaultcontactinitializationsettingsothatinitiallyoverclosednodesaretreatedasinterferencefits.

Beginbydefiningthegeneralcontactdefinition.

6.IntheModelTree,doubleclickInteractions.

7.IntheCreateInteractiondialogbox,nametheinteractiongcandselecttheInitialstep.

a.SelectGeneralcontact（Standard）asthetypeandclickContinue.

b.IntheEditInteractiondialogbox,selectnoFricfromthelistofavailableGlobalpropertyassignmentoptions.

c.Intheinteractioneditor,clickCreatenexttoInitializationassignments.

d.IntheEditContactInitializationdialogboxthatappears,namethepropertyfit-1.IntheInitialOverclosuresregionofthedialogbox,selectTreatasinterferencefits,asshowninFigureW5–2.

e.ClickOKtoaccepttheselectionandclosethecontactinitializationeditor.

FigureW5–2.Contactinterferenceoption

8.Intheinteractioneditor,clickEditnexttoInitializationassignments.Selectthesurfacepairsthatwillbeadjusted,asindicatedinFigureW5–3.Notethatafterselectinganitemineachcolumnontheleftsideofthedialogbox,youwillneedtoclick

inordertoaddtheselectionstothetableontherightsideofthedialogbox.

Thisassignmentwillcauseallinitiallyoverclosednodestoberesolvedusinganinterferencefit.

FigureW5–3Initializationtable.

9.ClickOKtoaccepttheselectionsandclosetheinitializationassignmenteditor.

10.Intheinteractioneditor,switchtotheSurfacePropertiestabbedpage.ClickEditnexttoSurfacesmoothingassignments,asshowninFigureW5–4.

FigureW5–4Surfacepropertyoptions.

11.Inthedialogboxthatappears,notethattheoptiontosmooththesurfacesisselectedbydefault,asshowninFigureW5–5.

FigureW5–5Surfacesmoothingoptions.

12.ClickOKtoaccepttheselectionandclosethesurfacesmoothingassignmenteditor.

13.ClickOKtoclosetheinteractioneditor.

Thecontactinteractionsarenowcomplete.

Definingconstraintsandboundaryconditions

Yournexttaskistodefinetheconstraintsandboundaryconditionsthatwillactontheassembly.Inthefirststepoftheanalysis,bothringsareheldfixed;inthesecondstep,theouterringisheldfixedwhiletheinneroneisrotated.Adistributingcouplingconstraintisusedtotransmittherotationtotheinnerring.

Definingadistributingcouplingconstraint

1.IntheInteractionmoduletoolbox,clickthereferencepointtool

tocreateareferencepoint.Locatethepointattheorigin（0,0）.

Thispointwillbeusedtoapplytherotationtotheinnersurfaceviaadistributingcouplingconstraint.

14.IntheModelTree,double-clickConstraintstocreateanewconstraint.

15.IntheCreateConstraintdialogboxthatappears,selectCouplingasthetypeandclickContinue.

16.Intheviewportselectthereferencepointcreatedearlierastheconstraintcontrolpoint;selecttheinnersurfaceoftheinnerringasthesurfacetobeconstrained.

17.Intheconstrainteditor,setthecouplingtypetoDistributing.AcceptallotherdefaultsandclickOK.

Definingtheboundaryconditions

18.IntheModelTree,double-clickBCstocreateanewboundarycondition.

19.IntheCreateBoundaryConditiondialogbox,selectDisplacement/RotationastheboundaryconditiontypeandInitialasthestepinwhichtoapplytheboundarycondition.Nametheboundaryconditionfix-yandclickContinue.

20.ClickSetsinthepromptareatoaccesstheRegionSelectiondialogbox.SelectFix-y.

21.IntheEditBoundaryConditiondialogbox,selectU2clickOKtoclosethedialogbox.

22.Usingasimilartechnique,defineaboundaryconditionintheInitialstepnamedfix-xtothesetFix-x（selectU1）.

23.Usingasimilartechnique,defineaboundaryconditionintheInitialstepnamedrefPttothereferencepoint（clickSelectinViewportinthepromptareatoselectthepointdirectly;selectU1,U2,andUR3）.

24.EdittherefPtboundaryconditioninthesecondstepandsetthevalueofUR3to2*pi.

Creatingandsubmittingajobforanalysis

Nowyouarereadytocreateandsubmitthemodelforanalysis.

25.Createajobnamedinterf-smoothing.Enteranysuitablejobdescription.Acceptallotherdefaultjobsettings.

26.Submitthejobforanalysis.Whilethejobisrunning,monitoritsprogress.

Visualizingtheanalysisresults

Aftertheanalysisiscomplete,youwillreviewtheresultsintheVisualizationmodule.

27.SwitchtotheVisualizationmodule,andopentheoutputdatabasefileinterf-smoothing.odb.

28.Click

toplottheMisesstress,asshowninFigureW5–6.Inthisfiguresomenodesontheinnerringhavebeenhighlightedtoallowustotracktherotation.

FigureW5–6.Misesstressdistributionwithsmoothing

atendofinterferencefitstep

29.Animatethesolutionhistory.FigureW5–7showstheconfigurationwhen25%,50%,and75%oftherotationhasbeenapplied.NotethepositionofthehighlightednodesineachcaseandhowthecontoursofMisesstressremainsmoothandconstantthroughouttheentiresimulation.Thisistheexpectedresultsincetheslidingbetweenthesurfacesoccursintheabsenceoffriction.

FigureW5–7.Misesstressdistributionwithsmoothing

atthreedifferentconfigurationsduringrotationstep

Part2:

Analysiswithoutsurfacesmoothing

Heregeneralcontactwillbeusedasbefore.Thistime,however,thedefaultoptiontosmoothsurfaceswillbetoggledoff.

30.Copythemodelnamedsmoothingtoonenamedno-smoothing.

31.Editthegeneralcontactinteractiontotoggleoffthesurfacesmoothingoption.

32.Createajobnamedinterf-no-smoothing.Enteranysuitablejobdescription.Acceptallotherdefaultjobsettings.

33.Submitthejobforanalysis.Whilethejobisrunning,monitoritsprogress.

34.Aftertheanalysisiscomplete,evaluatetheresultsintheVisualizationmodule.TheMisesstressattheendofthefirststepisshowninFigureW5–8.Notethenoiseinthesolution.Thebeneficialeffectsofgeometricsurfacesmoothingareclearlyevidentwhencomparedtotheearliersolution.

FigureW5–8.Misesstressdistributionwithoutsmoothing

atendofinterferencefitstep

Part3:

Analysisusingcontactpairswithpreciseadjustments

Herecontactpairswillbeusedinsteadofgeneralcontact.Acombinationofstrain-freeinitialadjustmentsplusdirectuserspecificationoftheinterferencedistancewillbeused.Thistechniqueisparticularlyusefulwhenyouarenotsureoftheinterferencerequiredorwishtoperformaparametricstudy.Ratherthancreateadistinctmeshforeachvalueofinterference,thesamemeshisre-usedandtheoverclosurevalueisspecifieddirectly.

35.Copythemodelnamedsmoothingtoonenamedadjust.

36.Deletethegeneralcontactinteractioncreatedearlier.

37.Definethefollowingsurfaces: