Femap_Training_Lesson 03 - Geometry Creation and Editing.ppt

PurposeThislessonprovidesanoverviewoftheFemap sgeometryimport creationandeditingtools TopicsGeometryOverviewParasolidGeometryKernelGeometryImportSolidsOverviewGeometryCleanupWireframeGeometryCreationandModificationSurfaceGeometryCreationandEditingSolidGeometryandEditingGeneralGeometryModificationToolsAdditionalGeometryToolsforMeshing Lesson3GeometryCreationandEditing Femapsupportsthecreationandmodificationofwireframe surface andsolidgeometryusingtheParasolidgeometrykernelFemapreadsmultipleCADformatsFemapgeometrycreationandeditingPoints 2Dand3DcurvesSurfacesSolidcreationandeditingoperationsSupportsSolid SheetandNon manifoldBodiesMidplanesurfaceextractionandediting tobecoveredinaseparatelesson GeometryOverview ParasolidgeometryisalwaysstoredinSI meters nomatterwhatunititiscreatedin Parasolidhasa box withdimensionsof1000 x1000 x1000withit soriginatthecenteroftheboxDefaultCoincidentPointToleranceof1 0E 8ParallelToleranceof1 0E 11RadiansIndependentofproduct Femap UGNX SolidEdge etc FromtheParasoliddocumentation Toallowprecisiontobehandledcorrectly allpartsofabodymustbewithinthisbox Itishighlyrecommendedtosetthedefaultunitinyourapplicationcodetoonemeter ParasolidsGeometryKernel ScalingofgeometryismanagedinFemapwiththeSolidGeometryScaleFactor SetinFemap spreferencesundertheGeometry Modeltabe g Whenthemodelslengthisinmillimeters alengthof1 0mmonthedesktopwillbestoredas 001metersinthedatabaseEffectivelyscalesthe box to 500 000mminX Y andZfromtheorigin CanalsobesetintheSolidModelReadOptionsdialogboxforParasolidandACISfilesandtheSTEPReadOptionsdialogboxforSTEP Whenthedialogboxesareopened theGeometryScaleFactorreflectsFemap spreference GeometryScaleFactorforMeters 1GeometryScaleFactorforInches 39 37GeometryScaleFactorforMillimeters 1000 SolidGeometryScaleFactor Note IfyouchangetheGeometryScaleFactortoavalueotherthanthevalueofFemap spreferenceinoneofthesedialogboxes thiswillupdateFemap spreferencetothevalueinput ImportgeometrywiththeFile Import Geometrycommand ImportGeometryiconcanbefoundontheMaintoolbarDirectCADInterfacesSolidEdge par psm pwd asm NXUnigraphics prt NXI deas idi Pro Engineer prt asm Catiav4 mdl exp dlv Catiav5 catP optionalSolidWorks sldprt sldasm StandardCADInterfacesParasolidACISSTEP AP203Solids AP214Surfaces IGESDXFSTL reads stlfilesastriangularsurfacemesh GeometryImporting WhensolidgeometryisimportedfromaCADfile areferencetothesourcefileofthegeometryimportediscreatedintheFemapmodel Thereferenceisbasedonthetime datestampoftheCADfile s imported includingmodification s tocomponentsinanassembly TheFile ReferencescommandisusedtoviewthestatusofareferenceinFemap Ifthetime datestampismodifiedduetochangesintheCADmodel thiswillbeshownintheReferenceManagerdialogbox Femap sdefaultpreferencesaresettogeneratereferencesuponimportandtoautomaticallycheckforreferenceupdateswhenopeningamodel GeometryUpdatesfromCAD ASolidbodyiscompletedenclosedbysurfacesandhasnogapsordanglingsurfaces AnySolidbodyisshownintheModelInfopane sGeometrytreewiththisicon SolidBodies Note RunningtheTools MassProperties SolidPropertiescommandwillshowthataSolidbodyhasVolume SheetbodieshaveoneormorecontiguoussurfacesthatdonotencloseavolumeFormulti surfaceSheetbodies allsurfacesmustconnectonacommonedgewithoneothersurfaceaswithsolid2belowASheetbodyisshownintheModelInfopane sGeometrytreewiththisicon SheetBodies NonManifoldbodiesareconnectedsolidsthatcanbeacombinationofSolidand orSheetbodies CreatingNonManifoldbodiesfrommid surfacedgeometrycanalsobeveryusefulformeshingpurposes assurfacescomingtogetherat T Junctions shareacommoncurve ASheetbodyisshownintheModelInfopane sGeometrytreewiththisicon NonManifoldBodies Afterimportinggeometry itisstronglyrecommendedthatyoucheckandfixallsolidgeometrybeforeattemptingtomeshTheSolid Geometry CleanupcommandchecksthevalidityofselectedsolidsinyourFemapmodelfile TheMeshingToolboxhastheEntityLocatortooltolocatecurvesandsurfaceswithinsolidsbyspecifyingasearchmethodandsize ThiswillbecoveredindetailinLesson11 TheMeshingToolbox GeometryCheckingandCleanup RemoveRedundantGeometryCleanscurvesimprintedonsurfacesandmergessurfacesthatarepartoftheunderlyingoriginalsurface RemoveSliverSurfacesRemovessmall sliver surfacesresultingfrominaccuraciesinsolidgeometryoperations CheckGeometryChecksthevalidityofthesolid Willshowthatanimportedsolidbodyisinrealityasheetsolidifimperfectionsaredetected MatchModelScaleFactorUsewhensolidsimportedareatadifferentSolidGeometryScaleFactorthanthefactorsetinFemappreferences Adjuststheselectedsolid s tothefactorsetinFemappreferences MusthaveCheckGeometryoptionenabled Advancedcleanupoptions Seesection3 4 2 22oftheFemapCommandsmanual Hasoptionstorepairandremovesmallfeatures SurfaceHealandStitchoptionissimilartoExplodeandStitchcommands Canonlybeusedononesolidatatime Geometry Solid CleanupCommand Note Ifyoustillhaveproblemscleaninggeometryformeshing analternativetechniqueistoExplodetheproblemsolid thenStitchitbacktogether WorkplanesWireframeGeometryDefaultsLinesArcsCirclesSplinesWireframeGeometryModificationBoundarySurfaces WireframeGeometryCreationandModificationTopics TheWorkplaneisusedtodefinethelocal X Y planefor2Dwireframeandsomesolidgeometrycreationcommands AccessviatheTools WorkplanecommandortheF2hotkey SnapOptionscontroldisplayofthegridspacing etc oftheworkplaneWorkplanedisplaycanbetoggledonandoffwiththeViewStyle WorkplaneiconontheViewtoolbarGriddisplayoptionsintheViewOptions ToolsandViewStyledialogboxcontrolscolorandfillsettingsfortheworkplane Workplanes DefaultcolorsforcurvesaresetinFemap sPreferencesdialogbox ColorcanalsobesetforamodelwiththeTools ParameterscommandorintheViewOptionsdialogbox Color ID DefaultLength SplineOrder etc aresetintheGeometryParametersdialogbox PresstheParametersbuttonintheLocate dialogboxtoaccesstheGeometryParametersdialogbox WireframeGeometryDefaults CreationwiththeGeometry Curve Linecommands LocateontheWorkplane ProjectPointsHorizontalVerticalPerpendicularParallelMidlineAtAngleAngletoCurvePointandTangentTangentRectangleLocatein3Dspace ContinuousPointsCoordinatesOffsetVectored Lines ArcsarealwaysplacedontheWorkplaneArccreationwiththeGeometry Curve Arccommands Center Start EndRadius Start End twopointsonthearcdefinethestartandendofthearc Apositiveradiuswillcreateanarclessthen180degreeswhileanegativeradiuswillgenerateanarcgreaterthan180degrees Angle Start End twopointsonthearcdefinethestartandendofthearc apositiveanglewillgeneratethearcfromthestarttotheendinacounterclockwisedirection anegativeanglewillgeneratethearcclockwisefromthestartpointtotheendpoint Chord Center Start locatethecenter startpointforthearc andachordlengthlessthantwicetheradius Points locatethestartpoint apointonthearc andtheend CenterandPoints usethistocreateanarcin3Dspace Specifybyfourpoints Center start end andafourthpointthatdefinesthedirectionofthearc Start End Direction specifythestartandendpoints andthetangentdirectionforthestartpoint Arcs CirclesarealwaysplacedontheWorkplaneCirclecreationwiththeGeometry Curve Circlecommands Radius twopointsdefinethecenterandapointonthecircle Diameter twopointsonthecircledefinethediameter Center definethecenterandtheradiusofthecircle TwoPoints locatetwopointsonthecircleandentertheradius Point Tangent locatethecenterpointandatangentcurve Concentric createacirclebyselectinganexistingcircleandthenewcircle sradius PointsonArc createacirclebythreepoints CenterandPoints createacirclebydefiningthecenter startingpointonthecircle andapointdefiningthepositivedirectionofthecircle Circles SplinescanbegeneratedbyControlPointsorbyPointsonthespline thespline scontrolpointsareautomaticallygeneratedbyFemap Four 4 pointBeziersplinesarecreatedwhenusingthefollowingcommands EllipseParabolaHyperbolaTheEquationsplineiscreatedbyspecifyingcoefficientsofparametriccubicequations ATangentsplineiscreatedbyspecifyingthestartandendpointsofasplineandthetangentsatthosepoints Splines ThesplinecreatedbytheBlendcommandcreatesasplineblendingtwocurves ABlendFactorcontrolstheinteriorshape TheOffsetsplineusesapointprojectedontotheWorkplanetodeterminetheoffsetlocation CombineasetofcontiguouscurvesintoasinglecurveusingtheMultipleCurvescommand Nottobeusedwithsharpcorners TheGeometry BoundarySurfacecommandcreatesplanarsurfacesmadeupofaboundarycurves Thiscommandisveryusefulwhenthewireframegeometryneedstobeconvertedtosurfacesand orsolids Canincludemultipleholes BoundarySurface s arenon Parasolidsurface s usetheGeometry Surface ConvertcommandtoconvertintoaParasolidsurface TheGeometry SketchcommandcreatesaBoundarySurfacefromcurvescreatedduringtheSketchcommandsequence AlsoaccessiblefromtheSolidtoolbar oncethesketchiscompleted youhavetheoptiontoextrudeorrevolvethe sketched boundarysurface TheModify Edit BoundarycommandallowsyoutoaddorremovecurvesfromanexistingBoundarySurface BoundarySurfacesandSketching Wireframegeometrycanbeeditedwiththefollowingcommands Modify TrimTrimstheintersectioncurves Thesecurvesmustextendpastoneanother willnotextendtotheintersection Modify ExtendExtendtheendpointoftheselectedcurve s toapointprojectedfromthepointnormaltothecurve Modify BreakSplitstheselectedcurve s atapointprojectedfromtheselectedpointnormaltothecurve Modify JoinTrimsand orextendstheselectedcurvestotheirintersectionpoint Modify FilletCreatesatangentarcbetweenthetwoselectedcurves Modify ChamferCreatesachamferbetweenthetwoselectedcurves WireframeGeometryEditing Note ExceptfortheBreakoperation thesecommandscannotbeappliedtosolidorsurfacegeometrycurves EdgeCurvesCreatesasurfacefrom3or4curves AlignedCurvesLoftsasurfacethroughcurves SweepUsedtosweepmultiple curvecrosssectionsalongacurveConvertUsedtoconvertboundarysurfacesandsurfacesmadewiththestandardFEMAPgeometryengineintoParasolidsurfaces OnlyplanarboundarysurfaceswillbeconvertedwiththeConvertcommand RemoveHoleUsedtoremoveinteriorvoidsinsurfaces Canalsobeusedtoremoveholesinsolids NonManifoldAddUsedtocombinesurfaceswhichdonotencloseavolumeand orcontainnon manifoldfeatures i e T junctions intoaParasolid GeneralBody MayalsobeusedtocombinesolidsandsurfacesintoaParasolid GeneralBody RecoverManifoldGeometryUsedto break aParasolid GeneralBody createdusingtheNonManifoldAddcommandintomanifoldsections SurfaceCreationandNon ManifoldGeometryCommands TheGeometry Curve FromSurfacesetofcommandsareusedtocreatecurvesonsurfaceswiththefollowingtechniques Intersect selecttwointersectingsurfacesand orsolids Project projecttheselectedcurve s normaltotheselectedsurface s ProjectAlongVector projecttheselectedcurve s alongthespecifiedvectorontotheselectedsurface s ParametricCurve specifyalocationtogenerateacurvealongaUorVdirectionontheselectedsurface Slice splittheselectedsurface s and orsolidsbyaplane SplitatLocations generateaparametriccurveonasurfacebyspecifyingthestartandendlocationsofthecurve WhentheUpdateSurfacesoptionisenabled defaultfornewmodels thecurvesbecomepartofthesurfaceandwill split thesurfaceintomultiplesurfaces ifthecurvesselectedmakeupaclosedloop Otherwise thecurvesgeneratedbythiscommandaresimplyinternalcurvesofthesurface SurfaceCurves TheOffsetCurve Washercommandgeneratescurvesoffsetfromtheselectedcurves TheWasheroptionisusedtogenerateconcentricarcsaroundtheselectedarc s OffsetCurvesisusedwhenthecurvestobeoffsetarearoundnon planarholesoraroundnon circularinteriorfeatures Forcaseswhereoffsetsofnon planarcurvesarerequested deselecttheAutoSelectSurfacesoption TheSaveSplitLinesoptioncreatesconnectinglinesfromtheselectedarc s totheconcentricarcsandtagsthesurfacearoundthearcstousemappedfourcornermeshing SurfaceCurves continued ThePadcommandgeneratesasquarecenteredattheselectedhole PadWidth 2XHoleDiameterXPadSizeFactorPadSizeFactor PadWidth 2 HoleDiameter SetupMappedMeshingsetsthemeshsizesaroundthefoursurfacesonthepadareaforFoursidedMappedMeshingThree 3 optionsforaligningtheorientationofthepad AutoAlignVectorAlignTangentAlign SurfaceCurves continued Finally threeadditionalcommandsexistforcreatingcurvesonsurfaces PointtoPoint selecttwopointsonasurfaceandaparametriccurveisgenerated SimilartotheSplitatLocationscommand exceptthatthepointsmustexistonthesurface Thesurfaceisautomaticallyselectedbythefirstpoint PointtoEdge generatesacurveonasurfacebyselectingaexistingpointonasurfaceandacurveontheinteriororexteriorboundaryofthesurfacetoprojectthatpointonto EdgetoEdge projecttheendpointsselectedcurve s alongthespecifiedve