Femap网格划分 及交互式网格修改.docx

Femap网格划分 及交互式网格修改.docx

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Femap网格划分及交互式网格修改

Femap网格划分及交互式网格修改

TableofContents

OverviewandSetup1

AccessingtheModel2

SettingtheMeshSizes2

MeshingtheModel4

InteractivelyRefiningtheMesh6

OverviewandSetup

ThegeometrymodelforthisdemonstrationisaFemapmodelfilewhichisbasedonaParasolidmodelofathin-walledsheetmetalpart.ThismodelwaspreviouslyimportedintoFemapandmid-planeswereextractedtocreateasurfacegeometrymodel.Theintentionofthisdemonstrationistoshowhowfiniteelementmeshsetup,meshingandinteractivemesheditingcanbeappliedtocreateahighqualityFEmodelthatwillyieldaccurateresults.

AsmuchuseaspossiblehasbeenmadeoftheModelInfotree,toolbarsandiconsintheuserinterfacetoaccessFemap’sfunctionality.Usuallythereismorethanoneapproachthatcanbeemployedforanygivencommand.

NotethattheParasolidmodelfilewascreatedusingmillimetersastheunitoflength.Allreferencestolengthinthisdemonstrationthereforeareinmillimeters.

Toensurethatyouhaveallofthenecessaryiconsdisplayed,astandardlayoutshouldbeloadedusingtheLoadlayoutcommand:

-SelectFilePreferences

-IntheToolbarssectionoftheUserInterfacetab,selecttheLoadLayoutbutton

-IntheLoadLayoutFromdialog,browsetotheworkshopdirectoryandselecttheWorkshop.layoutfile,andclickOpenandOK

AccessingtheModel

OpentheFemapmodelfilefromtheworkshopdirectory

-SelectFileOpenorselecttheFileOpenicon

ontheModeltoolbar,andbrowsefortheFemapmodelfileFemap_BracketMesh_Start.modfem（此文件可从QQ群199022551下载）–thismodelfilealreadyhassomegeometrymodificationsinreadinessformeshing

SettingtheMeshSizes

Inthissectionwe’llactivatemeshmarkersandcount,setadefaultmeshsize,overridethedefaultbysettingameshsizeonsurfaces（thisactivatesthecount）,andsetparticularmeshsizesforthethreewasheroffsetcurvesonthemodel.

-MakesurethattheMeshSizemarkersareswitchedonbyselectingthedropmenurightarrowoftheViewStyleicon

intheViewtoolbar–verifythattheMeshSizeicon

isactivatedinthedropdownmenu

-SelectView/OptionsorclicktheF6shortcutkeyandintheViewOptionsdialogwithintheLabels,EntitiesandColorcategory,selectCurve–MeshSizeintheOptionsarea

-IntheShowAsareaoftheViewOptionsdialog,select3..SymbolsandCountandclickOK

-SelectMesh/MeshControl/DefaultSizeandenteraSizeof5.andclickOK

-SelectMesh/MeshControl/SizeonSurfaceorclickontheMeshSizeonSurfaceicon

intheMeshtoolbar

-IntheEntitySelectdialogclickSelectAllandOK

-IntheAutomaticMeshSizingdialog,enter6.25fortheElementsSizeandclickOKandCancel

-ZoomintotheareathatcontainsthethreewasheroffsetcurvesatthefrontofthemodelbyselectingtheZoomicon

intheViewtoolbar

-SelectMesh/MeshControl/SizeAlongCurveorclickontheMeshSizeonCurveicon

ontheMeshtoolbar,intheEntitySelectiondialogselectallofthewasheroffsetsemi-circularcurvesandthecurvesaroundeachofthethreeholes,verifyselectionbyclickingontheSelectionHighlighticon

andclickOK

-Enter6fortheNumberofElementsintheMeshSizeAlongCurvesdialogandclickOK

-BackintheEntitySelectiondialog,selectallofthesplitcurvesforeachofthethreeholes,andclickOK

-Enter2fortheNumberofElementsintheMeshSizeAlongCurvesdialog,andclickOKandCancel

-SelectthePreviousZoomicon

ontheViewtoolbar

MeshingtheModel

Withthepreparatoryworkfinished,thenexttaskistomeshthemodel.

-SelectMesh/Geometry/SurfaceorclickontheMeshSurfaceicon

ontheMeshtoolbar

-IntheEntitySelectiondialog,clickSelectAllandOK

-IntheAutomeshSurfacesdialogclicktheDefinePropertyicon

-IntheDefinePropertydialogclicktheDefineMaterialicon

-IntheDefineMaterialdialogclicktheLoadbuttonandtheChooseLibrarybutton

-Browsetoinstall_directory/femap11/mat_eng_mm-N-tonne-degC-Watts.esp,selectandclickOpen

-Select16-25-6StainlessSteelandclickOK

-ClickOKtoacceptthematerialdefinition

-IntheDefinePropertydialogenter1.981forthethicknessandclickOK

-IntheAutomeshSurfacesdialogclickOKandthefiniteelementmeshwillbecreated

InteractivelyRefiningtheMesh

Nowthatthemodelhasbeenmeshedwe’llusetheMeshingToolboxwithliveelementqualitycheckingtoverifythatthemeshsettingsdefinedpreviouslyhavecreatedasdesiredandwe’llmakesomefurthermeshadjustmentsinteractively.Inparticularwe’llsuppressahole,mergesomesplitcurvesandtidyupthemeshusingtheMeshSizingandMeshLocatecapabilitieswithintheMeshingToolbox.

-ActivatetheMeshingToolboxbyclickingtheMeshingToolboxicon

inthePanestoolbar

-SelecttheMeshQualitytool

-ClickontheQualityicon

intheheaderlineoficonsintheMeshingToolboxpane

-ClickonthedownarrownexttoQualityTypeJacobianintheMeshQualitytooltoshowthatotherqualitychecksareavailable

-ExpandthetoolnexttoJacobianbyclickingthe+signandsettheMaxAllowableValueto0.8（amorereasonablevalueforaJacobiancheck）

-SelecttheZoomicon

intheViewtoolbarandzoomintotheareaofthemodelwiththethreeholeswithwasheroffsetcurvesforwhichpresetcurvemeshsizeswereset

-SelectthePreviousZoomicon

ontheViewtoolbarthenselecttheZoomicon

againandzoomintotheareaofthemodeltotherightthatcontainedtheflangewiththepad

-SelectthePreviousZoomicon

ontheViewtoolbartoreturntothefullmodelview

-SelecttheZoomicon

intheViewtoolbarandzoomintotheareaofthemodeltotheleft

-ClickontheFeatureSuppressiontoolintheMeshingToolboxdialog

-IntheheadericonsoftheMeshingToolboxselectthedownarrownexttotheRemeshToolsicon

andselectAutoRemesh

-SelecttheSelecticon

（nexttoAutoRemesh）

-Tosuppresstheholeintheflangeselectbothofthedefiningcurves,theholeshoulddisappearandthemodelremeshautomatically,howeverthedefiningcurveswillremainastheholehasonlybeensuppressedandnotdeleted

-DeselecttheSelecticonandrotatethemodelaroundtogetabetterviewoftheleftside–themeshoftheinteriorcornersurfacehalfwayuptheleftsideisuneven,andyoucanseethatthedefiningcurvesateitherendcomprisetwocurves（ascreatedbytheCADsystem）,sowe’llcombineeachofthemintoonetogetbettercontrolofthemesh

-SelecttheCombined/CompositeCurvestoolandreselecttheSelecticon

-Selectthemidnodeontheleftandrightcurvesofthecornersurface–themeshisstillunevenbecauseofthemismatchedelementcountonthetopandbottomcurves

-SelecttheMeshSizingtoolwhichwillbeusedtoincreasethemeshdensityofthebottomcurve

-SetOperationtoSetToandenter24fortheNumberofElements

-SelecttheSelecticonandselectthebottomcurveofthecornersurfaceanddeselecttheSelecticon

-Thereisoneelementtotherightjustunderthecornerthatiscoloredred,SelecttheZoomicon

tozoomintothiselement

-Tofixthiselementwe’llmanuallydragoneofthecornernodestochangetheelementshape,selecttheMeshLocatetool

-TheSelectMeshtoEditentryiscurrentlysettoAttachedtoSurface,clickonthedownarrowtotherightandselectAttachedtoSolid

-Nowclickontheicon

nexttothedownarrow,andselectthesolid（thereisonlyonethatcomprisesallsurfacesinthismodel）

-IntheSelectSolid/VolumedialogclickOK

-SelecttheSelecticon

-Pickanddragthenodeoftheredcoloredelementthatisinteriortothemodel,movingituntiltheelementcolorchangestogreen

-DeselecttheSelecticon

Thebracketmodelmeshisnowcompleteandallelementspassthesetqualitycriterion.

-FinallytocleanupthedisplayselectthedropmenurightarrowoftheViewStyleicon

intheViewtoolbaranddeselecttheMeshSizeicon

Thisconcludesthebracketmodelinteractivemeshingdemonstration.