析包括接触定义和输出内容设定.docx
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析包括接触定义和输出内容设定.docx
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析包括接触定义和输出内容设定
Introduction
InthisworkshopyouwilluseABAQUS/CAEtocompletethepumpassemblymodelandtosubmititforanalysis.Youwillbeginbydefiningtheanalysisstepsandtheoutputrequestsassociatedwiththesesteps.Next,youwilldefinetheinteractionsbetweenthedifferentcomponentsofthemodel.Youwillalsoapplyboltandpressureloadsandboundaryconditionstothemodel.Finally,youwillcreateandsubmitajobforanalysisandevaluatetheanalysisresults.
Definingtheanalysissteps
Theanalysishistoryofthepumpassemblyconsistsoftwosteps:
astepthatsimulatesthepre-tensioninginthebolts,followedbyastepthatsimulatesthepressurizationoftheboltedassembly.
1.OpenthemodeldatabasefilePumpAssy.cae.SwitchtotheStepmodule,andinthecontextbarselectpump_ribsfromthelistofavailablemodels.
2.CreateageneralstaticstepnamedPreloadBolts.Activategeometricnonlinearity(toggleonNlgeom),andspecifyaninitialtimeincrementof0.05andatotaltimeperiodof1.0.
3.CreateasecondgeneralstaticstepnamedPressure.InsertthisstepafterthestepnamedPreloadBolts.Specifyaninitialtimeincrementof0.1andatotaltimeperiodof1.0.
4.Activatethecontactdiagnosticprintoutforboththesteps.Fromthemainmenubar,selectOutputDiagnosticPrint.IntheDiagnosticPrintdialogbox,clickintheblankareaundertheContactcolumnforbothstepssothattickmarksappear,thusactivatingcontactdiagnosticoutputforthesesteps.
ClickOKtoclosethedialogbox.ABAQUS
Definingcontactandconstraints
Themereproximityofthemodelcomponentsdoesnotindicatethatthepartinstanceswillinteractduringtheanalysis.Thus,unlessexplicitlyspecified,theindividualcomponentsofanassemblywillnotinteractwithoneanother.Foranyloadstobeproperlytransmittedbetweenthecomponents,youmustdefineinteractionsbetweenthecomponents.Instructuralanalysisproblemsthemostcommonmethodoftransferringloadsbetweenunconnectedregionsofamodelassemblyisthroughcontactinteractions.Todefineacontactinteractionbetweenanytwobodies,however,youmustfirstidentifytheregionsofeachbodythatwillbeinvolvedincontact(e.g.,definesurfaces).Yournexttaskinthisworkshop,therefore,willbetodefinesurfacesoneachcomponentthatwillbeinvolvedincontact.
Definingthesurfaces
InABAQUS/CAEasurfacecanbecreatedeitheronapartthathasunderlyinggeometry(suchasurfaceisknownasageometry-basedsurface)oronapartthatdoesnothaveunderlyinggeometry(e.g.,anorphanmesh;suchasurfaceisknownasamesh-basedsurface).Sincethisassemblyconsistsofbothimportedgeometryandanorphanmesh,youwillcreatebothtypesofsurfaces.
5.SwitchtotheInteractionmodule.
6.MakeonlythepumphousingvisibleusingtheAssemblyDisplayOptionsdialogbox(ViewAssemblyDisplayOptions).
7.CreateasurfacenamedPumpBotbyfollowingthestepsgivenbelow:
A.Fromthemainmenubar,selectToolsSurfaceManager.
B.IntheSurfaceManager,clickCreate.
C.TheCreateSurfacedialogboxappears.SelectMeshasthesurfacetype.NamethesurfacePumpBot,andclickContinue.
D.Youwillbepromptedfortheregionstodefinethesurface.Foramesh-basedsurface,youcaneitherselecttheelementsindividuallyorselectagroupofelementsbyspecifyingthemaximumdeviationinthefaceanglebetweenadjacentelements.Thefaceanglemethodisingeneralamoreefficientwayofchoosingelementstodefineasurface.Hence,inthepromptareaselectbyangleastheselectionmethodandenterafaceangleof5degrees.
E.Clickanyelementfaceonthebottomofthepump.Alltheelementfacesonthebottomofthepumpwillthenbehighlightedinred,asshownin
FigureW13–1.ClickDoneinthepromptareawhenyouarefinished.
FigureW13–1.SurfacePumpBot
8.Similarly,createasurfacenamedPumpBoltsthatdefinesasurfaceintheregionofthepumpthatwillcomeintocontactwiththeheadsofthebolts.Selectthesurfaceusingafaceangleof5degrees,asshowninFigureW13–2.
9.Next,defineasurfaceintheregionwheretheinternalpressurewillbeappliedtothepump.NamethesurfacePumpInside.Usingthefaceanglemethodwithamaximumdeviationof24.1degrees,selecttheelementfacesshownin
FigureW13–3.
Tip:
Use[Shift]+Clicktoselectmorethanoneitematatime.Selectasmanyregionsaspossibleusingthefaceangletechnique;thenselectanyremainingregionsindividually.Zoominasnecessarytofacilitateyourselections.Todeselectanyunintentionallyselectedregions,use[Ctrl]+Click.
FigureW13–2.SurfacePumpBolts
FigureW13–3.SurfacePumpInside
10.UsetheAssemblyDisplayOptionsdialogboxtorestorethevisibilityofthecoverandtosuppressthevisibilityofthepumphousing.
11.Defineageometry-basedsurfacenamedCoverTopontheregionofthecoverwhereitcontactsthegasket.
12.DefineasurfacenamedCoverInsidethatdefinestheregionwherethepressureloadwillbeappliedasshowninFigureW13–4.
13.Createasurfaceforeachofthefourholesinthecoverasshownin
FigureW13–5.NamethesesurfacesBoltHole-1throughBoltHole-4.
Note:
Keeptrackoftheorderinwhichyoudefinetheboltholesurfacessincelateryouwillhavetocreatecorrespondingsurfacesontheboltshanks.Youshouldsaveyourcurrentview(ViewSaveUser1)tomakeiteasierwhendefiningtheboltssurfaceslater.
14.RestorethevisibilityofthegasketandsuppressthevisibilityofthecoverusingtheAssemblyDisplayOptionsdialogbox.Definesurfacesonthetopandbottomregionsofthegasket.NamethesesurfacesGasketTopandGasketBot,respectively.
15.Suppressthevisibilityofthegasket,andrestorethevisibilityofthebolts.Settheviewtotheuser-definedview(ViewViewsToolboxandclick1intheViewsdialogbox).
16.Createasurfaceforeachboltthreadcorrespondingtoeachboltholesurfaceinthecover,asshowninFigureW13–5.NamethesurfacesBoltThread-1throughBoltThread-4.
17.CreateasinglesurfacethatincludestheregionsdirectlyundertheheadsofalltheboltsasshowninFigureW13–5.NamethissurfaceBoltHeads.
18.SaveyourmodeldatabaseasPumpAssy.cae.
FigureW13–4.SurfaceCoverInside
surface
BoltThread
surface
BoltHeads
surfaceBoltHole
FigureW13–5Bolt-relatedsurfaces
Definingthecontactinteraction
Nowthatyouhavedefinedthesurfacesthatwillbeinvolvedincontact,youcandefinethecontactinteractionsbetweenthedifferentcomponents.DefiningcontactinteractionsinABAQUS/CAEinvolveschoosingthesurfacesinvolvedcontactanddefiningcontactproperties(friction,etc.)foreachinteraction.Followthestepsgivenbelowtodefinethecontactinteractionsforthismodel.
19.Fromthemainmenubar,selectInteractionPropertyCreatetocreateacontactpropertynamedFriction.
20.IntheEditContactPropertydialogbox,selectMechanicalTangentialBehavior.ChoosethePenaltyfrictionformulation,anddefineacoefficientoffrictionof0.2.ClickOKtoclosethedialogbox.
21.Fromthemainmenubar,selectInteractionCreatetocreateanABAQUS/Standardsurface-to-surfacecontactinteractionintheInitialstep.NametheinteractionPump-Bolts.
22.ClickSurfacesinthepromptareatoselecttheregionsinvolvedincontactusingthesurfacesdefinedearlier.IntheRegionSelectiondialogbox,choosethesurfacePumpBoltsasthemastersurface(sinceitiscontinuous)andthesurfaceBoltHeadsastheslavesurface(sinceithasarelativelyfinermeshandisdiscontinuous).UsetheSmallslidingformulation,adjustslavenodeswithin1.e-5in.ofthemastersurfacetoensurethatthesurfacesareinitiallyincontact,andacceptFrictionasthecontactproperty.
23.CreateanotherABAQUS/Standardsurface-to-surfacecontactinteractionintheInitialstepbetweenthebottomofthegasketandthetopofthecover.NametheinteractionnamedCover-Gasket.ChoosethesurfaceCoverTopasthemastersurface(sincetheunderlyingelementsaremuchstiffer)andGasketBotastheslavesurface.UsetheSmallslidingformulation,adjustslavenodeswithin1.e-5in.ofthemastersurfacetoensurethatthesurfacesareinitiallyincontact,andacceptFrictionasthecontactproperty.
Definingtieconstraints
Tieconstraintswillbeusedtotiethegaskettothepump.Youwillalsodefinetieconstraintstosimulatetheeffectoftheboltthreadswhenfastenedtotheboltholes.
24.Fromthemainmenubar,selectConstraintCreate.NametheconstraintPumpGasket.SelectTieastheconstrainttypeandclickContinue.
25.ThelistofpreviouslydefinedsurfacesappearsintheRegionSelectiondialogbox;selectthesurfacePumpBotasthemastersurfaceandthesurfaceGasketTopastheslavesurface.AcceptallthedefaultsettingsintheEditConstraintdialogbox,andclickOKtoclosethedialogbox.
26.Inasimilarfashion,definetieconstraintsbetweeneachboltthreadanditscorrespondingbolthole.Ineachcase,selecttheboltholetobethemastersurfaceandtheboltthreadtobetheslavesurface.NametheconstraintsTie-1throughTie-4.IntheEditConstraintdialogbox,specifyadistanceof0.07asthepositiontoleranceandtoggleoffAdjustslavenodeinitialpositionforeachconstraint.
Tip:
Aftercreatingthefirsttieconstraintbetweentheboltandtheboltholes,copytheconstraintandedittheregionselections.
27.SaveyourmodeldatabaseasPumpAssy.cae.
Definingloadsandboundaryconditions
Yournexttaskwillbetodefinetheloadsandboundaryconditionsthatwillactonthestructure.
Applyingboltloads
InABAQUS/CAEassemblyorboltloadsareappliedacrossuser-definedpre-t
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