精选AbaqusCAECONTW03QBoltedFlange.docx
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精选AbaqusCAECONTW03QBoltedFlange.docx
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精选AbaqusCAECONTW03QBoltedFlange
FigureW3–1.Theflangeassemblymodel(geometry,left;mesh,right)
Tieconstraintswillbeusedtodefinetheinteractionbetweentheboltsandnuts.Frictionalcontactisassumedbetweenallmatingparts.Thecoefficientoffrictionis0.1forallinteractionswiththeexceptionofthoseinvolvingthegasket,forwhichitis0.4.Becauselittlerelativemotionisexpectedbetweentheparts,smallslidingconditionscanbeassumed.Thecontactinteractioncanbedefinedusingeithercontactpairsorgeneralcontact(althoughforthelatter,finiteslidingmustbeusedsincesmallslidingisnotavailableforgeneralcontact).
Preliminaries
1.Entertheworkingdirectoryforthisworkshop
../contact/interactive/flange
2.Runthescriptws_contact_flange.pyusingthefollowingcommand:
abaquscaestartup=ws_contact_flange.py.
TheabovecommandcreatesanAbaqus/CAEdatabasenamedbolted-flange.caeinthecurrentdirectory.Thegeometry,mesh,andmaterialdefinitionsareincludedinthemodel.Youwilladdthenecessarydatatocompletethemodel,runthejob,andfinallypostprocesstheresults.
ConfiguringtheAnalysis
Theanalysisconsistsofasinglegeneralstaticstepinwhichtheboltsaretightened.
Tocreateageneral,staticanalysisstep:
1.IntheModelTree,double-clickSteps.
2.IntheCreateStepdialogbox:
a.NamethestepTightenbolts.
b.Fromthelistofavailablegeneralprocedures,selectStatic,Generalifitisnotalreadyselected,andclickContinue.
3.Inthestepeditor:
a.IntheBasictabbedpage,toggleonNlgeom.
b.SwitchtotheIncrementationtabbedpageandsettheinitialincrementsizeto0.25.
c.ClickOKtocreatethestep.
Definingtieconstraints
Tieconstraintswillbedefinedbetweentheboltsandthenuts.Wewillusethecontactdetectiontooltodefinetheseconstraints.Beforeproceeding,switchtotheInteractionmodule.
4.IntheInteractionmoduletoolbox,click
.
IntheFindContactPairsdialogboxthatappears.Bydefault,theentiremodelissearchedforpossibleinteractions.Sinceweareonlyinterestedinthenutsandbolts,wewillrestrictthesearchtotheinstancesofthenutsandbolts.
5.SelectInstanceasthesearchdomainandclickEditRegion,asshowninFigureW3–2.
6.Intheviewport,selectthethreeboltinstancesandthethreenutinstances(use[Shift]+Clicktomakemultipleselections),asshowninFigureW3–2.
7.ClickFindContactPairs.
Threepotentialpairsaredetected.
8.SelectthecellsundertheTypecolumnforallthreeandclicktheEdittool
.IntheEditMultipleCellsdialogboxthatappears,selectTieconstraint,asshowninFigureW3–2.
9.
FigureW3–2.Tieconstraintsbetweennutsandbolts
Definingcontactproperties
Priortodefiningthecontactinteractions,youwilldefinethefrictionalcontactproperties.
10.IntheModelTree,double-clickInteractionProperties.
a.NamethepropertyFriction-0p1andselectContactasthepropertytype.
b.Inthecontactpropertyeditor,selectMechanical→TangentialBehavior.
c.SelectPenaltyasthefrictionformulationandassignafrictioncoefficientof0.1.
d.Inthecontactpropertyeditor,selectMechanical→NormalBehavior.
e.SelectPenaltyastheconstraintenforcementmethod.
11.RepeattheprevioussteptocreateapropertynamedFriction-0p4andassignitafrictioncoefficientof0.4.
Definingcontactinteractions
Youhavethechoiceofusingeithercontactpairsorgeneralcontactforthisproblem.Chooseeithermethod.Bothareequallysuitedforthisclassofproblem.Ifyouprefertousecontactpairs,continuebelow;otherwise,skiptopageW3.8tousegeneralcontact.
Contactoption1:
Contactpairs
1.IntheInteractionmoduletoolbox,click
.IntheFindContactPairsdialogboxthatappears,clickFindContactPairs.
Eighteenpotentialcontactpairsaredetected.Examinethepairsbyclickingontheminthetable.Thishighlightsthemintheviewport.Notethatsomepairsaremissing(e.g.,someoftheboltshank–gasketpairs).Thisisanindicationthatthedefaultvalueoftheseparationtolerancewithinwhichpairswillbeincludedistoosmall.
2.Settheseparationtoleranceto0.01,andclickFindContactPairs.
3.Nowtwentypotentialcontactpairsaredetected.Eachflangehas7contactpairsassociatedwithit:
onewiththegasket,3withtheboltshanks,and3withtheboltheads/nuts(dependingonwhetheritisthetoporbottomflange).Inaddition,eachbolthasapotentialinteractionwiththegasket(3)anditsnut(3;theseweredefinedpreviouslyastieconstraintsandwillbedeletedfromthecurrentlist).Clicktherowstohighlightthedetectedpairsintheviewport.
4.Makethemasterandslaveinstancenamesvisible(clickmousebutton3anywhereinthetableandselectEditVisibleColumns,asindicatedinFigureW3–3).
FigureW3–3.Controllingcolumnvisibility
5.Findthethreeinteractionsbetweentheboltsandthenuts.Sincewehavepreviouslydefinedtieconstraintsbetweenthem,deletethesefromthecurrentlistofpotentialinteractions(selectthethreerowsandclicktheDeletetool
asshowninFigureW3–4).
FigureW3–4.Deleteredundantconstraints
6.WecanaugmentthecurrentlisttoshowthepreviouslydefinedtieconstraintsbyclickingShowpreviouslycreatedinteractionsandties,asshowninFigureW3–5.Thelistofpreviouslycreatedtiesappearsatthebottomofthelistinbluetext(asopposedtotheblacktextusedforthecurrentlistofpotentialinteractions).
7.
FigureW3–5.Displayingpreviouslycreatedinteractions
8.Recallthatallcontactinvolvingthegasketassumesafrictioncoefficientof0.4.Bydefault,allinteractionswereassignedpropertyFriction-0p1(correspondingtoafrictioncoefficientof0.1).Sortthelistbyslaveinstance.Selectthepropertycellsforallrowswherethegasketistheslaveinstance.Theregionsarehighlighted,asshowninthetopofFigureW3–6.ChangethepropertytouseFriction-0p4,asshowninthebottomofFigureW3–6.
FigureW3–6.Gasketfrictionproperties(regions,top;celledits,bottom)
9.Sortthelistbyseparationdistance.Modifytheadjustmentoftheinteractionswithzeroseparation(leavingthetieconstraintsalone).Theregionsarehighlighted,asshowninthetopofFigureW3–7.Specifyanadjustmentzonetoleranceof0.01,asshowninthebottomofFigureW3–7.
Thiseditensuresthatallpairsofflatsurfacesareinitiallyincontact(top/bottomflange-gasket,bottomflange-nut,topflange-bolthead).
FigureW3–7.Adjustmentbetweenflatsurfaces(regions,top;celledits,bottom)
10.ChangeallSlidingoptionstoSmall.
11.ClickOKtoclosetheFindContactPairsdialogboxandcreatethecontactpairs.
12.ExpandtheInteractionsandConstraintscontainersintheModelTreetoverifythepresenceofthecontactpairsandtieconstraints.
13.Thecontactdefinitioniscomplete;skiptopageW3.13todefineloadsandboundaryconditions.
Contactoption2:
Generalcontact
Globaldefinitionofgeneralcontact
12.IntheModelTree,double-clickInteractions(orselectInteraction→Create).
13.IntheCreateInteractiondialogboxthatappears,setthesteptoInitialandchooseGeneralcontact(Standard)asthetype.ClickContinue.
14.Intheinteractioneditor,selectFriction-0p1fromthelistofavailableGlobalpropertyassignmentoptions.Thisassignsaglobalcoefficientoffrictionequalto0.1.
Refiningthegeneralcontactdefinition
Thegeneralcontactalgorithmoffersaverysimpleuserinterfacewherebytheentirecontactdomainisdefinedautomaticallyandpropertiesareassignedglobally.Thecontactdomainandlocalproperties,however,canberefinedasnecessary(usingapair-wiseapproach)toenhancetheglobalinteractiondefinition.
Contactbetweenthegasketandtheflangeswilluseacoefficientoffrictionequalto0.4.Thus,wewillneedtooverridetheglobalcontactpropertydefinedabove.
Inaddition,wewillintroducenon-defaultadjustmentsbetweensomesurfacepairsinordertoachieveapreciseinitialcontactstatebetweenthem.Theadjustmentswillbedefinedbetweenthefollowingregionsofthemodel:
∙Boltheadsandthetopflange
∙Gasketandtheflanges
∙Nutsandthebottomflange
Inordertoproceed,wemustfirstdefinethenecessarysurfaces.Forconvenience,thesewillbedefinedatthepartlevel.
Definesurfaces:
15.IntheModelTree,expandthePartscontainerandunderneathitexpandthepartnamedflange.Double-clickSurfaces.DefinethetwosurfacesindicatedinFigureW3–8(usethefaceangletechniquetofacilitatetheselections).
FigureW3–8Surfacesassociatedwiththeflanges.
16.
Similarly,expandthepartnamedgasketanddefinethethreesurfacesindicatedinFigureW3–9(notetheorientationofthepartwhendefiningthesurfacesonthetopandbottomofthegasket;usethefaceangletechniquetofacilitatetheselections).
FigureW3–9Surfacesassociatedwiththegasket.
17.Similarly,expandthepartnamedboltanddefinethesurfaceindicatedontheleftsideofFigureW3–10(usethefaceangletechniquetofacilitatetheselections).RepeatforthepartnamedhalfBolt(seeFigureW3–10).
FigureW3–10Surfacesassociatedwiththebolts.
18.Similarly,expandthepartnamednutanddefinethesurfaceindicatedontheleftsideofFigureW3–11(notetheorientationofthepartwhendefiningthesurface;usethefaceangletechniquetofacilitatetheselections).RepeatforthepartnamedhalfNut(seeFigureW3–11).
FigureW3–11Surfacesassociatedwiththenuts.
19.Tofacilitatethesurfaceselectionthatwilloccurlater,theindividualboltheadsurfaces,a
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