1几何模型建立Word下载.docx

1几何模型建立Word下载.docx

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螺栓预紧+内压

ABAQUS

Introduction

ThestructuralresponseofthepumpassemblyshowninFigureW3–1willbedetermined.Theassemblycomponentsincludethepumphousing（importedasanorphanmesh）,agasket,acover,andeightbolts（allimportedasCADgeometry）.Theanalysisinvolvesapplicationofpre-tensioningloadsintheboltsfollowedbyinternalpressure.

FigureW3–1.Pumpassembly

Inthisworkshop,youwillcreatethepartsofthemodel.UsethePartmoduleofABAQUS/CAEtoimportthemeshofapumphousing.Somemodificationsofitsgeometricfeaturesfollow.Theothercomponentsofthepumpassembly（cover,gasket,andbolts）willbeimportedasCADgeometry.Allofthepartswillbehalvedtotakeadvantageofsymmetry.

Note:

Thepartscreatedinthisworkshopwillbeusedinsubsequentworkshopstobuildthecompletemodelandtoperformtheanalysis.Itisimportantthatyouusethedimensionsstatedandnotdeviatefromtheworkshopinstructions;

otherwise,youmayfinditdifficulttocompletethesubsequentworkshops.

Orphanmeshimport

Followthestepsbelowtoimportthemeshofthepumphousingmodel.

1.StartanewsessionofABAQUS/CAEfromworkshops/pumpdirectory.

ABAQUS/CAEautomaticallyloadsthePartmodule.

2.Fromthemainmenubar,selectFileImportModel.Fromthelistofavailablemodels,selectpump_ribs.inp.

3.ABAQUS/CAEtakesafewsecondstoimportthemodel.Oncethemodelisimported,youwillbeintheAssemblymodule.SwitchbacktothePartmodule.Noticethatanewmodel（namedpump_ribs）whichcontainstheimportedpart（namedPUMP–1）hasbeencreated.ThemodelappearsasshowninFigureW3–2.

FigureW3–2.Orphanmeshofpumphousing

Editingnodalcoordinates

Yourfirsttaskwillbetochangetheinnerdiameteroftheholethatgoesthroughthetopofthepump.Thecoordinatesofthenodesalongtheinnerdiameterneedtobechanged.Sincethesenodeslieonacircularsurface,itwillbeadvantageoustodefineacylindricalcoordinatesystemandsimplychangetheradialcoordinateofthenodes.Followthestepsbelowtoachievethistask.

4.Fromthemainmenubar,selectViewViewsToolbox.IntheViewsdialogbox,selectthe1–2view.TurnofftheperspectiveviewbyclickingtheTurnPerspectiveOfftool（

）,andzoomintothecomponentsothattheholeisclearlyvisible（seeFigureW3–3）.

FigureW3–3.Topviewofpumphousing

5.Fromthemainmenubar,selectToolsDatum.TheCreateDatumdialogboxappears（seeFigureW3–4）.SelectCSYSasthedatumtype.Selectthe3pointsmethod,andclickOK.Whenpromptedforthetypeofcoordinatesystem,chooseCylindrical.Placethecoordinatesystemattheorigin（0.0,0.0,0.0）andclickCreateDatum.

Acylindricaldatumcoordinatesystemiscreated.Theoriginofthecoordinatesystemcoincideswiththepositionofthecenterofthehole.

FigureW3–4.CreateDatumdialogbox

6.Youwillnowmodifytheinnerdiameterofthehole.Fromthemainmenubar,selectToolsEditMesh.IntheEditMeshdialogbox,selectNodeasthecategoryandEditasthemethod,asshowninFigureW3–5.ClickOKtoclosethedialogboxandproceed.

FigureW3–5.EditMeshdialogbox

7.Youwillbepromptedtoselectthenodestobemodified.BeginbysettingtheselectionfiltersasshowninFigureW3–6byclickingtheShow/HideSelectionOptionstool,

inthepromptarea.

FigureW3–6.Selectionfilters

8.Thenodescanbeselectedinoneoftwoways:

∙Tryselectingthenodesindividually（thedefaultselectiontechnique）usingaCircularDragShape.Thecenterofthedragshapeshouldbethecenterofthecylindricalcoordinatesystemdefinedearlier（seestep2）.Selectaperimeterpointforthedragshapesuchthatyouincludeallthenodesontheinsidesurfaceofthehole.Theselectednodeswillbehighlightedinredaftertheselection,asshowninFigureW3–7.Youmaywishtorotateyourmodeltocheckwhetherallthenodeshavebeenselectedproperly.

∙Youmayalsoselectthenodesusingthefaceanglemethod（i.e.,byspecifyingthemaximumdeviationintheanglebetweenadjacentelementfaces）.Thistechniqueisgenerallymoreefficientthanselectingthenodesindividually:

allnodesthatpertaintotheelementfacesthatsatisfythefaceanglecriterionareautomaticallyselected.Inthepromptarea,choosebyfaceangleasthemethodbywhichthenodeswillbeselected.Then,clickonanyelementfacelocatedontheinnersurfaceofthehole.Thenodesontheinnersurfacearehighlightedinredaftertheselection.Asbefore,rotateyourmodeltomakesureallthenodeshavebeenselectedproperly.

Onceyouaresatisfiedwiththeselection（usingeithermethod）,clickDoneinthepromptarea.

FigureW3–7.Modifiednodes

9.TheEditNodesdialogboxappears,asshowninFigureW3–8.Thisdialogboxwillbeusedtochangethediameterofthehole.ClickSelectintheupperrightcornerofthedialogbox,andchoosethecylindricalcoordinatesystemdefinedinstep2byclickingonitintheviewportwhenpromptedtochoosealocalcoordinatesystem.

10.UsingtheCoordinatesspecificationmethod,changethe1–coordinate（i.e.,theradialcoordinate）byselectingSpecifyfromthepulldownlistandentering0.65.ClickOKtoclosethedialogboxandthenDoneinthepromptareatocompletetheoperation.

FigureW3–8.EditNodesdialogbox

Deletingelements

Youwillnowremovetheribsonthepumphousingandthenyouwillremovehalfofthepart.Beginbyremovingsomeoftheelementsintheriblocatednearthefrontofthehousing,asshowninFigureW3–9.Usethe1–3viewfromtheViewsToolbox,androtatethepumptoviewoneofthefrontribs,asshowninFigureW3–9.

FigureW3–9.Ribelements

11.Fromthemainmenubar,selectToolsEditMesh.IntheEditMeshdialogbox,selectElementasthecategoryandDeleteasthemethod.ClickOK.

12.Whenpromptedtoselecttheelementstobedeleted,usetheShow/HideSelectionOptionstooltochangethedragshapetoaPolygon.Selectsomeoftheelementslocatednearthe90bendoftherib,asshowninFigureW3–9.

13.Inthepromptarea,toggleonDeleteassociatedunreferencednodes.

14.Zoomoutandrotatetheviewtoconfirmthatonlyelementspertainingtotheribshavebeenselected.Ifanyotherelementsarehighlighted,deselectthemusing[Control]+Click.Whenyouaresatisfiedwiththeselection,clickDonetodeletetheelementsandtheirassociatednodes.

15.Theremainingribsonthepumphousingcanberemovedbycarefullyselectingtheminasimilarfashion.Thiscanbeatediousandtime-consumingprocessforlarge,complicatedmodels.Tofacilitatesuchtasks,elementsmayalsobedeletedusingsets.

A.Fromthemainmenubar,selectToolsEditMesh.IntheEditMeshdialogbox,clickOKtocontinuedeletingelements.

B.InthepromptareatoggleonDeleteassociatedunreferencednodes.

C.Inthepromptarea,clickSetstoopentheRegionSelectiondialogbox.Inthisdialogbox,selectthesetRIBSandtoggleonHighlightselectionsinviewporttohighlighttheelementsbelongingtothisset.

D.ClickContinuetodeletetheremainingribelements.

E.ClickCanceltoclosethedialogbox.

Youwillnowhalvethepumphousing.Usethe1–2viewfromtheViewsToolboxtofacilitateelementselection.

16.Fromthemainmenubar,selectToolsEditMesh.IntheEditMeshdialogbox,clickOKtocontinuedeletingelements.

17.Inthepromptarea,toggleonDeleteassociatedunreferencednodes.

Tip:

IftheRegionSelectiondialogboxappears,clickSelectinViewportontherightsideofthepromptareasoyoucanselectelementsintheviewport.

18.Selecttheupperhalfofthepumphousingfordeletion,asshowninW3–10.Whenyouaresatisfiedwiththeselection,clickDonetodeletetheelementsandtheirassociatednodes.

ThehalfpumphousingwithouttheribsisshowninFigureW3–11.

19.Savethemodeldatabase.NamethemodeldatabasefilePumpAssy.cae.

FigureW3–10.Selecthalfofthepumphousing.

FigureW3–11.Halvedpumphousingwithoutribs

ImportingCADgeometry

YouwillnowimporttheremainingcomponentsoftheassemblyintoABAQUS/CAE.

20.Fromthemainmenubar,selectFileImportParttoopentheImportPartdialogbox.

21.Inthisdialogbox,setthefiletypetoACISSAT.Fromthelistofavailablefiles,selectcover.sat.ClickOKinthedialogboxtoproceed.

22.IntheCreatePartfromAcisFiledialogbox,selecttheName-Repairtabandtoggleonalltheavailablerepairoptions.ClickOKtoclosethedialogboxandcontinue.

TheimportedpartisshowninFigureW3–12a.

23.Afterthepartisimported,usetheGeometrydiagnosticspartquerytools（ToolsQuery）tocheckforanyinvalidorimpreciseentities.

24.Repeatsteps2through4toimportthepartdefinedinfilegasket.sat.

TheimportedpartisshowninFigureW3–12b.

25.Importthepartdefinedinfilen_bolts.satwithoutanyrepairoptionsturnedon.TheimportedpartisshowninFigureW3–12c.

26.Reviewthedifferentpartsofyourmodel.QuerytheimportantdimensionsusingtheQuerytoolsandnotethemforfuturereference.

27.SaveyourmodeldatabaseasPumpAssy.cae.

（a）cover

（b）gasket

（c）bolts

FigureW3–12.Componentsofpumpassembly

Halvingtheimportedgeometry

Youwillnowremovehalfofeachoftheimportedparts.Beginwiththecover.

28.FromthePartlistlocatedunderthetoolbar,selectcovertoaccessthecovergeometry.

29.Fromthemainmenubar,selectViewSpecify.UsingtheViewpointmethod,enterthecoordinatesoftheviewpointas0,0,-1andthecoordinatesoftheupvector