ANSYS 英文实用培训教程.docx
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ANSYS英文实用培训教程
ENSC895Assignment3Tutorial
Lastupdatedon:
Feb25th,2013
Inthislab,studentswilllearnthebasictechniquesofFEAanalysis.AstaticstructuralanalysiswillbeperformedonaracksystemusingANSYSworkbench.Geometrysimplificationwillbeintroducedtothestudents.Severalmeshtechniqueswillbebrieflyintroducedtothestudents.Howevermappedmeshingisthecorelearningobjective.Thelabwillalsointroducethestudentswithbasicpost-processingtechniquesneededtointerprettheanalysisresults.
Learningobjectives:
Mid-surfacetechnique:
studentshavetolearnhowtoextractthemid-surfacetoproducehighqualitymesh.Theruleofthumbisthataslongasthethicknessis1/5ofthewidthorlength,thebodycanbesimplifiedtosurfacebody.Surfacebodyusesplaneorshellelementssuchassolid186orshell181.However,thestudentsdon’thavetoworryaboutwhichelementstoselectfromsinceANSYSwillautomaticallyselectthem.Therearetwowaystoextractmid-surfaces,seetutorialsfordetails.
Learnbasicdefeaturingtechniques:
Certainunnecessarydetailsshouldberemovedfromtheanalysisinordertoobtainbettermeshingeffects.Forexample,filletsandchamfersthatdon’tplaymajorrolesinFEAanalysisinmanycasescanbeignoredtogeneratebetterlocalmesh.Studentscandoacomparativestudytoseetheeffectiftimepermits.
Numberofdivisionspercycle:
Accordingtocertainindustrystandard,thecirclehastobedividedintoatleast12elements.NormallyANSYSversion14.5willautomaticallydetectanddividethecircleto12elements.Ifnot,onecandoitmanually.Seedetailsfromthetutorials.
BondedcontactwithMPCalgorithm:
Inthisassignmentallcontactswillbeautomaticallygenerated.Butsomegeometricalpreprocessingisneededinordertohaveeffectivecontacts.
Convergencestudy:
Ameshindependentstudyshouldbeperformedonthestructuretoseehowmeshqualitiescanaffectthefinalresults.Withtheimprovementofmeshthestressvalueshouldapproachasteadystatemeaningitsvalueshouldbewithin5%.
Checkreactions:
LearnhowtocheckthereactionsafteraFEAanalysishasbeenperformed.Forexample,three1000Nforcesareaddedondifferentlevelandthereactionatitsboundaryshouldbebalancedforthestructuretobeinequilibrium.
EnteringANSYS
DoubleclickonANSYSworkbench
fromdesktop.
OnceyouhaveenteredANSYSworkbenchdragStaticStructuralfromtheAnalysisSystemtotheblankareacalledontheright.ThendoubleclickonGeometrytoaccessDM(DesignModeler).
SelectMillimeterasthedesiredlengthunit.
BriefIntroductiontosomefunctionsinDM(DesignModeler)
ThefunctionsbelowintheredboxesarethecommonlyusedfunctionsinANSYSpreprocessing.Thesefunctionsareprimarilyusedforgeometrysimplifications.Geometrysimplificationisoneofthemostimportanttasksinpreprocessing.ProperlysimplifiedgeometrycangreatlyimprovethequalityofmeshandthusresultspredictedbytheFEAanalysis.
Mid-Surface:
Itisusedtoextractthemiddle-surface.Whenabodycanbeconsideredasaplateorshell(itsshortestdimensionisthe1/5ofotherdimensions),normallyitshouldbesimplified.I
Thin/Surface:
ThisisabackupchoiceforMid-SurfaceasMid-Surfacefailstoworksometimes.Itcanalsobeusedtoachieveothertaskssuchasformingacavity.
FaceDelete:
Thisisusedtodeleteunnecessaryfacesinordertoimprovemeshquality.Unnecessarydetailsoftenimpedeonefromproducinghighqualitymesh.
EdgeDelete:
SameasFaceDelete,butitisforoperationsonedges.
NewPlane:
Userscanestablishnewplanesforallkindsofpurposes.However,inthisexercise,itisprimarilyusedasreferenceplaneforcutting/slicing.
Slice:
Thepurposeofslicingoperationismultiple.InthisanalysisSliceoperationsareneededinordertogeneratemoremappableregions.Withmappableregions,thequalityofmeshshouldbehigher.
Mappableregions:
Mappableregionsarethosesurfaceareasonwhichmappedmeshcanbegenerated.Mappedmeshestypicalhavehighqualityandeffectiveness.Areascoveredbymappedmeshtypicallylooksmoreregularintermsoftheshapeofthemesh.Usemappedsurfacemeshwheneverapplicable.
Doubleclickonengineeringdata.
First,clickonEngineeringDataSources
.ThenclickonGeneralMaterialstoseealistofcommonlyusedengineeringmaterials.ThenmoveontoOutlineofgeneralmaterialsandclickontheaddsign
.AddAluminumAlloyforlateruse.(Steelisdefaultedmaterialwhichyoudon’thavetoadd)GobacktotheDM.
DoubleclickonGeometrytoaccessANSYSDM.
ImportgeometryintoANSYSworkbench:
ClickonfileandselectImportExternalGeometryFile.Thelocationoftheparasolidgeometry(x_t)willbegiventoyou.
Thegeometrywilllooklikethisifitisimportedcorrectly.
ExtractingMiddleSurfaces
Mid-surfacecommandwillbeusedtoextractmiddlesurfaceofthesheetmetal.Selectfacepairsbyclickingonthefrontandbacksideofthecolumnbar.Aftersuccessfullyselected,itwillbehighlightedinpurple.
However,inordertoselectasmanylegitimatesurfacebodiesaspossible,onecanexploititsauto-selectioncapabilitybychangingtheselectionmethodfrommanualtoautomatic.Noteyoushouldclickon“Findingsurfacepairsnow”onceinorderforthistowork.Thenallavailablesurfacebodieswillbeselectedallatoncewhichwillsaveyouconsiderableamountoftime.
ThereareoccasionsthatMid-surfacewillfailtoworkduetothecomplexityofthegeometry.Fortunately,thereisanothermethodwecanuseinordertobypassthisissue.Thin/SurfacecanbeusedasatooltoextractsurfacebodywhileMid-surfacefailstowork.Clickonthesurfacebodieswhileholdingthectrlkeythisallowsyoutoselectasmanysurfaceasyoumightneed.ChangetheSelectionTypetoFacestoKeepasindicatedbelow.Sincethebottomplateshavethicknessof3mm,inordertoserveasmiddlesurfacesthefaceoffsetshouldbehalfofitwhichis1.5mm.
Defeaturing
NormallygeometriesimportedfromCADsoftwarearetoocomplicatedandhavetoomanydetailstocapture.AsaFEAanalyst,youhavetoknowhowtoremoveunnecessarydetailsasitwillimprovethequalityofmesh.
Surface-deleteisatechniquetodeleteunwantedsurfaces.Forexample,inmanycasesfilletsandchamfersdon’tplayamajorroleinstressanalysisandthuscanbedeleted.
Edge-deleteissimilartoSurface-deleteinwhichitremovesunnecessaryedgesinsteadofsurfaces.
Settingupthethickness:
WhenThin/Surfaceisusedtoextractmiddlesurfaceitwillloseinformationonitsthickness.GotoANSYSDesignSimulation(DS)bydoubleclickingonModel.All“part3”arebottomholdingplates,itshouldbenotedthat“part3”arewithquestionmarksbeforesetup.Selectallof“part3”andsetthethicknessto3mm.
Thenextstepisquitecrucialforgeneratinghighqualitymesh.Inordertoproducehighqualitymesh,thegeometryshouldbemadetobemappable(SometimesSweepableinthecaseofsolids).Inordertohaveasmanymappableregionaspossible,Slicefunctionisusedtoseparatethegeometrytosimplershapesandthusmorelikelytobemappable.
Slicecanbeperformedundertheconditionthatthegeometryorapartofthatgeometryisfrozen.WhilethegeometryisfirstimportedtotheDM,itisdefaultedtobefrozen.Thereforeslicecanbeappliedtoeachbodydirectly.
Thereareseveralslicingmethods.Commonlyusedinthisexercisearetwo:
1)SlicebySurface;2)Slicebyplane.
SlicebySurface:
Selectthesurfacethatyouwanttouseasatoolsurface.ClickonSliceandchangeSliceTypetoSlicebySurfaceandapply.Asindicatedbelow,thegeometrywillbeslicedaboutthetoplevelsurface.Dothisrepeatedlyfor3differentlevels.
SlicebyPlane:
Inorderforthisslicingmethodtowork,anewcoordinatesystemneedstobeconstructed.Clickon
tocreateanewcoordinatesystem.Thenewcoordinatesystemwillbeestablishedonthecorner.
Inorderforslicingplanetowork,onehastore-orientthecoordinatesystemsuchthattheredandgreenaxisformingtheplaneofslicing.Inotherwords,slicingplanewillbeperpendiculartotheblueaxis.
Thenewcoordinatesystemwillbeshown.ChangeTypetoFromPointandNormal.Aspoint-normalmethodwillbethemostconvenientwaytoconstructacoordinate.
Basepointwillbetheoriginofthecoordinatesystemandclickonthevertexasindicatedbelow.ClickonNormalDefinedbyandthengotogeometrytoclickanaxisthatyouwanttospecifyasthenormalaxis.Abigredarrowwillbeshowninthescreentoindicatethedirectionyourselectednormalline.Itdoesn’tmatterastowhatdirectionthebluearrowispointingat,aslongastheredandgreenaxesformtheplaneofcuttingitshouldbeworkingcorrectly.
Thenextstepistousethecoordinatesystemthatyoujustcreatedasareferencetoslicetheplane.
SelectSlicefunctionandchoosetheSliceTypeasSlicebyPlanethistime.ChangetheBasePlanetotheplanethatyouwanttosliceabout.(Normallyifyouhavejustcreatedacoordinatesystem,itwillbedefaultedtoBasePlane.Clickongeneratetoseetheeffect(youcanpressF5aswell).
Createacoordinatesystemagainforanothercornerthistime.Justrepeattheproceduredescribedaboveuntilall4sideshavebeencovered.
Andthenuseslicebasedonthecoordinatesystemjustcreated.
Thisiswhatitlookslikewhenyouhaveslicedtwosides.
If4sidesareslicescorrectly,youshouldgeometryshouldresembletheoneshownbelow.
Createanewcoordinatesystemasshown.
Slicebasedonthecoordinatejustcreated.
Ifyouhavedoneit