PATRAN中如何修补模型间隙.ppt

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1、WORKSHOP8SURFACEMESHINGFORNONCONGRUENTSURFACESWorkshop8–SurfaceMeshForNoncongruentSurfacesObjectivesImportgeometricsurfacesfromaMSC.Patranneutralfile.Observethemanygapsbetweenadjacentsurfaceedges.Meshthesurfaceswithtriaelements,thenconnectelementswherethereareinternalfreeelementedges.Create

2、ageometricsurfacefromthetriamesh.Meshthenewsurface.Workshop8–SurfaceMeshForNoncongruentSurfacesProblemDescriptionTocreateafiniteelementmodelforseveralgeometriccomponents(forthiscasemultiplesurfaces;seebelow)itisnecessarytoconnectadjacentelements(e.g.Equivalence)atgeometricinterfaces.Whenthe

3、rearegaps(largerthanthetolerance(*),ordifferenceofvertices(**))atinterfacesitismoredifficulttoconnecttheelements.Onewaytodealwiththisistocreateatriangular(tria)elementmeshforeachofthegeometricentities,“sew”(~equivalence)theregionswheretherearenoelements,thencreateasinglegeometricsurfacefrom

4、allthetriaelements.Finally,deletethetriaelementmesh,andcreatea2-Dmesh(e.g.Quad4)bymeshingthesinglesurfaceobtainedfromthetriaelementmesh.***Workshop8–SurfaceMeshForNoncongruentSurfacesSuggestedExerciseStepsCreateaDatabase.ImportaMSC.Patranneutralfilewithsurfaces.Showthedistancebetweentwopoin

5、ts.Create2-Dmesh.Closegapsbetweenadjacenttriaelements.Lookatelementfreeedgeboundaries.Deleteoriginalgeometryandcreatenewsurface.Meshnewsurface.Workshop8–SurfaceMeshForNoncongruentSurfacesStep1.CreateaDatabaseCreateanewdatabasenamedshell.File/New.Entershellasthefilename.ClickOK.SelectDefault

6、undertolerance.SelectMSC.NastranasAnalysisCode.SelectStructuralasAnalysisType.ClickOK.abdcfegStep2.ImportaMSC.PatranNeutralFileWithSurfacesImporttheneutralfilecalledshell_prt.out.1.File/Import.SelectNeutralasSource.Locatethefilenamednon_cong_surfs.out.ClickApply.ClickYes.ClickYes.abcdefThis

7、iswhattheimportedsurfacesshouldlooklike.LookatthegapsStep2.ImportanMSC.PatranNeutralFileWithSurfaces(Cont.)Step3.ShowtheDistanceBetweentwoPointsDeterminethedistancebetweentwoadjacentpoints.Thiswillhelpinthedeterminationofthevalueoftheglobaledgelengthfors