Patran for Advanced Users Exercise_16_Freebody_An

PATRAN302ExerciseWorkbook-Release7.516-1FreebodyAnalysisofaTrussXYZXYZLESSON16Objectives:■Createthegeometryforasimpletruss■Performafreebodyanalysisonthetruss16-2PATRAN302ExerciseWorkbook-Release7.5LESSON16FreebodyAnalysisofaTrussPATRAN302ExerciseWorkbook-Release7.516-3SuggestedExerciseSteps:1.Openanewdatabasenamedtruss.db.2.Createthegeometryforthetruss.Theleftedgewillbe3unitshighandtherightvertexwillbelocatedat[7,5.5,0].Thecrossbarswillbecreatedbymakingalinenormaltothebottomandcopyingit.Theremainingcrossbarswillbecreatedbyjoining2points.3.CreateameshseedthenmeshthetrusswithBar2elements.4.Applyaverticalloadof235attipofthetruss.Alsoapplyamid-spanloadof981.0inthemiddleandconstrainalldegreesoffreedomontheleftside.5.Createamaterialandnameitsteel.GiveitanElasticModulusof30E6,Poison’sRationof0.3andaDensityof0.00296.CreateanI-BeamusingElementPropertiesandtheBeamLibraryandapplyittothetruss7.AnalyzethemodelwithMSC/NASTRANmakingsuretoselectGridPointForceBalanceaspartoftheOutputRequests.8.Readinthe.op2resultsfileandperformafreebdyanalysisonthemodelusingTools/FreebodyAnalysis.ExerciseProcedure:1.Createanewdatabasenamedtruss.db.ClickonOKwhentheNewModelPreferenceformappears.2.Createthegeometryforthetruss.Youwillstartwiththeoutsideverticaledges.File/New...NewDatabaseName:trussOKGeometryAction:Create16-4PATRAN302ExerciseWorkbook-Release7.5Then,createthelowerouteredge.Finally,createtheremainingedge.Thefunctionautoexecutes.Object:CurveMethod:XYZVectorCoordinateList:0,3,0ApplyVectorCoordinateList:7,5.5,0ApplyAction:CreateObject:CurveMethod:PointStartingPointList:Point2(seefig4.1)EndingPointList:Point3(seefig4.1)LESSON16FreebodyAnalysisofaTrussPATRAN302ExerciseWorkbook-Release7.516-5Figure4.1NowyouwillcreatetheinnercrossbeamsofthetrussThefunctionautoexecutes.Nowusethecurveyoujustcreatedtomake3moreparalleltoitandalongCurve2.Action:CreateObject:CurveMethod:NormalPointList:Point2CurveList:Curve2(seefig4.1)Action:TransformObject:CurveMethod:TranslateXYZXYZPoint2Point3Curve216-6PATRAN302ExerciseWorkbook-Release7.5SinceyouwantthecurvestofollowalongCurve2thenyoumustmakeyourTranslationVectorfollowthattoo.SelecttheTipforaVectoricon,thenclickonPoint4.(Seefigure4.2)Figure4.2Thefunctionautoexecutes.Trimthecurvessotheydonotextendoutsidethetruss.RepeatCount:3TranslationVector:CurveList:Curve4Action:EditObject:CurveTipforVectorwithBaseat[0,0,0]XYZXYZPoint4Curve4LESSON16FreebodyAnalysisofaTrussPATRAN302ExerciseWorkbook-Release7.516-7Thiscommandworksbyselectingthepointtocutat,TrimPointList,thenselectingthecurvetocutandtheendpointofthesideyouwishtodelete.First,todefinethetrimpointselecttheCurveIntersecticon,ThenclickonCurve3andCurve5.Figure4.3Thefunctionautoexecutes.Method:TrimTrimPointList:SeeFigure4.3CurvetoTrim/EndPoint:SeeFigure4.3XYZXYZFirstclickintheTrimPointListdataboxthenselectCurve3andCurve5SecondlypicktheCurvetoTrim,Curve5Third,picktheEndPointofCurve5ontheendyouwouldliketotrim16-8PATRAN302ExerciseWorkbook-Release7.5Toviewthenewcurveclickontherefreshgraphicsicon.RepeatthisprocedureforCurves6,7Nowjoinallthecrossbeamsbycreatingcurves8,9,10.Figure4.4Action:CreateObject:CurveMethod:PointStartingPointList:SeeFigure4.4EndingPointList:SeeFigure4.4XYZXYZStartingPointsEndingPoints=BreakingPointsCurve8Curve9Curve10LESSON16FreebodyAnalysisofaTrussPATRAN302ExerciseWorkbook-Release7.516-9Tomakemeshingeasierwewillbreaktheoutercurvessothateverycurveonlymeetsanotheratitsendpoint.BesuretoturnofftheAutoExecutebutton.Whenaskedifyouwishtodeletetheoriginalcurve,respondYes.NowrepeatthisprocedureforCurve33.NowmeshthemodelAction:EditObject:CurveMethod:BreakDeleteOriginalCurvesAutoExecuteCurveList:Curve2BreakPoint:SeeFigure4.4(BreakingPointsaredenotedbythelargecircledpoints)ApplyYesFiniteElementsAction:CreateObject:MeshSeedType:UniformNumber=1CurveList:SelectallonScreenAction:CreateObject:MeshType:CurveElementTopology:Bar216-10PATRAN302ExerciseWorkbook-Release7.54.WehavecreatedthegeometryandFEM.NowwewillapplytheLoadandBoundaryConditions.Therewillbe3LBCsets.Averticalloadappliedatthetipofthetruss,amid-spanloadappliednearthecenterofmassandconstraintsonallDegreesofFreedomwherethetrussisattachedtoafixedsurface.Note:TheNode/ElementidsmaybedifferentthanshownbelowFigure4.5CurveList:SelectallonScreenApplyAction:EquivalenceObject:AllType:ToleranceCubeApplyclamped_endNode6Node14LESSON16FreebodyAnalysisofaTrussPATRAN302ExerciseWorkbook-Release7.516-11First,createtheloadonthetip.Thencreatethemid-spanload.Loads/BCsAction:CreateObject:ForceType:NodalNewSetName:vertical_loadInputData...ForceF1F2F3:0,-235,0OKSelectApplicationRegion...GeometryFilter:FEMSelectNodes:Node14AddOKApplyAction:CreateObject:ForceType:NodalNewSetName:midspan_loadInputData...ForceF1F2F3:0,-981,0OKSelectApplicationRegion...GeometryFilter:FEMSelectNodes:Node6Add16-12PATRAN302ExerciseWorkbook-Release7.5FinallyconstraintheleftedgefrommovinginalldirectionsOKApplyAction:CreateObject:DisplacementType:NodalNewSetName:clamped_endInputData...TranslationsT1T2T3:0,0,0RotationsR1R2R3:0,0,0OKSelectA