加筋板静力分析

WORKSHOP5StiffenedPlateSubjectedtoPressureLoadWorkshop5StiffenedPlateModelGOAL:modelastiffenedpanelusingplateelementsforthepanelandBEAMelementsforthestiffenerWorkshop5(cont.)StiffenedPlateModelWewillmodelaplatewhichis0.1inchesthick,20.0incheslong,and10.0incheswide.Thestiffenerisshownbelow,alongwiththeplatedimensionsandloadingThemodelhaspinnedsupportsatthecorners

Workshop5(cont.)StiffenedPlateModelMaterialproperties:E=10.3E+6psiPoissonsRatio=.3Density=.101lb/in3(weightdensity)ThestiffenerwillbemodeledusingaBEAMwithaPBEAMLtodefinethecross-sectionTheGRIDpointswilllieatthemid-planeoftheplate,sotheBEAMmustbeoffsetfromtheGRIDpointsby1.05(halftheBEAMheightpushalftheplatethickness)Workshop5(cont.)StiffenedPlateModelWorkshop5(cont.)StiffenedPlateModelPBEAMLEntry

PBEAML,2,1,,I ,2.,1.,1.,.1,.1,.1SampleCBEAMCBEAM212313.0.1.05Workshop5(cont.)StiffenedPlateModel-PressureLoadDefinitionPressureloadsonplateandshellelementsaredefinedusingPLOAD2orPLOAD4entriesSID=StaticLoadingSetIDEIDi=ElementIDP=Pressure(appliedinelementcoordinatesystem)

PLOAD2,1,-.5,1,THRU,20Workshop5(cont.)SuggestedExerciseSteps:CreateafiniteelementmodeloftheplatemadeofCQUAD4elements.ThestiffenerismadeofBEAMelement.Definematerialproperties.(MAT1)DefineelementpropertiesandsectionalpropertiesusingtheBEAMlibrary.Applyloadsandboundaryconditionstothemodel.SubmitthemodeltoMSC.Nastranforanalysis.Post-ProcessresultsusingMSC.Patran.CreatethefirstsurfaceGeometry:Create/Surface/XYZ.Enter<2050>fortheVectorCoordinateList.Use[000]astheOriginCoordinateList.ClickApply.Step1:CreateFiniteElementModelabcdCreatethesecondsurfaceGeometry:Create/Surface/XYZ.Leave<2050>astheVectorCoordinateList.ClickintheOriginCoordinatesListboxandscreenpickpoint2astheorigin.Step1:CreateFiniteElementModelabc

Createmeshseedsthatwillbeusedtoguidethemesh.Elements:Create/MeshSeed/Uniform.FortheNumberofElements,input5.SelectSurface1.2astheCurveList.Step1:CreateFiniteElementModelSurface1.2Surface1.1Surface2.1abc

Repeatthepreviousprocedurestocreate2moresetsofmeshseeds.Input2usetheNumberofElements.SelectSurface1.1astheCurveList.SelectSurface2.1astheCurveList.Step1:CreateFiniteElementModelabcStep1:CreateFiniteElementModel

Createsurfacemeshbasedonthemeshseedsassignedintheprevioussteps.Elements:Create/Mesh/Surface.SelectQuadastheElemShape.SelectIsoMeshastheMesher.EnterSurface12forSurfaceList.ClickApply.abcdeStep1:CreateFiniteElementModel

Createacurvemeshfortheplatestiffeners.Elements:Create/Mesh/Curve.SelectBar2astheElementShape.EnterthecurvesbyselectingthecurvesoffthescreenSurfaceforCurveList.ClickApply.abcdStep1:CreateFiniteElementModel

MergeallthecoincidentnodesbyusingEquivalencefunction.Elements:Equivalence/All/ToleranceCube.ClickApply.abStep2:DefineMaterialProperties

Createthematerialaluminum.Materials:Create/Isotropic/ManualInput.TypeinalumfortheMaterialName.ClickontheInputPropertiesbuttontobringuptheInputOptionwindow.Enter10.3E6fortheElasticModulus,and0.3forPoissonRatio,and0.101forthedensity.ClickOKtoreturntothemainmaterialmenu.ClickApply.abcdefStep3:DefineElementProperties

Createtheelementproperties.Properties:Create/2D/Shell.EnterplateasthePropertySetName.ClickontheInputPropertiesbutton.ClickonaluminthewindowthatappearswhenyouclicktheSelectMaterialIcon.Enter0.1asthethicknessfortheplate.ClickOK.Selectelement1:20fortheApplicationRegion.(picktheelementicon)ClickAdd.ClickApply.abcefghidStep3:DefineElementProperties

Createtheelementproperties.Properties:Create/1D/Beam.EnterbeamasthePropertySetName.ToggletheoptionfromGeneralsectiontoTaperedSection.GeneralsectioninNASTRANmeanstheCBARelementwhereasTaperedsectionmeansCBEAMelement.ClickontheInputPropertiesbutton.ClickonthealumintheMaterialPropNamebox.EntertheBarOrientationandOffsetsasshown.ClickontheBeamLibraryIcon.abcdefgStep3:DefineElementProperties

Createthebeamcrosssection.EnteribeamastheSectionSetName.ClickonIbeambutton.InputH,W1,W2,t,t1,t2as2,1,1,0.1,0.1,0.1ClickonCalculate/Display,thenyouwillseethesectiondiagramonthenextpage.ClickOK.Selectelement21:35fortheApplicationRegion.(Picktheelementicon)ClickAdd.ClickApply.abcdefghStep3:DefineElementPropertiesStep4:ApplyLoadsandBoundaryConditions

Createtheboundaryconditionforthemodel.Loads/BCs:Create/Displacement/Nodal.EntertranslationsastheNewSetName.ClickontheInputData.Enter<000>fortheTranslationfield.ClickOK.ClickonSelectApplicationRegion.SelectFEMasthegeometryfilter.SelectNode1,6,31,36fortheApplicationRegion.Thesearethefourcornernodesinthemodel.ClickAdd.ClickOK.ClickApply.abcdefghijkStep4:ApplyLoadsandBoundaryConditionsAfteryouhavecompletedprevioussteps,thenyoushouldseetheconstraintsonthemodelasshownbelow:Step4:ApplyLoadsandBoundaryConditions

Applypressureloadtothemodel.Loads/BCs:Create/Pressure/ElementUniform.EnterpressureastheNewSetName.ClickontheInputDatabutton.Enter0.5intheTopSurfPressurebox.ClickOK.ClickonSelectApplicationRegionbutton.SelectFEMastheGeometryFilter.SelectElement1:20fortheApplicationRegion.ClickAdd.ClickOK.ClickApply.abcdefghikjStep4:ApplyLoadsandBoundaryConditionsYoucanseethepressureloadvalueof0.5isimposedontopoftheplate.Step5:AnalyzetheModel

Submitthemodelforanalysis.Analysis:Analyze/EntireModel/FullRun.ClickontheSolutionType.SelectLINEARSTATICastheSolutionType.ClickOK.ClickApply.abcdeStep8.Analysis:AccessResults/AttachXDB/ResultEntities

AttachtheXDBresultfile.Analysis:AccessResults/AttachXDB/Resul