ANSYS中plane183单元

PLANE1832-D8-Nodeor6-NodeStructuralSolidMPMESTPRPRNDSPPEMEMFSProductRestrictionsPLANE183ElementDescriptionPLANE183isahigherorder2-D,8-nodeor6-nodeelement.PLANE183hasquadraticdisplacementbehaviorandiswellsuitedtomodelingirregularmeshes(suchasthoseproducedbyvariousCAD/CAMsystems).Thiselementisdefinedby8nodesor6nodeshavingtwodegreesoffreedomateachnode:translationsinthenodalxandydirections.Theelementmaybeusedasaplaneelement(planestress,planestrainandgeneralizedplanestrain)orasanaxisymmetricelement.Thiselementhasplasticity,hyperelasticity,creep,stressstiffening,largedeflection,andlargestraincapabilities.Italsohasmixedformulationcapabilityforsimulatingdeformationsofnearlyincompressibleelastoplasticmaterials,andfullyincompressiblehyperelasticmaterials.Initialstateissupported.Variousprintoutoptionsarealsoavailable.SeePLANE183intheMechanicalAPDLTheoryReferenceformoredetailsaboutthiselement.Figure183.1:PLANE183GeometryPLANE183InputDataThegeometry,nodelocations,andthecoordinatesystemforthiselementareshowninFigure183.1:PLANE183Geometry.Althoughadegeneratedtriangular-shapedelementmaybeformedbydefiningthesamenodenumberfornodesK,LandOwhenKEYOPT(1)=1,itisbettertouseKEYOPT(1)=1fortriangularshapedelements.Inadditiontothenodes,theelementinputdataincludesathickness(TK)(fortheplanestressoptiononly)andtheorthotropicmaterialproperties.Orthotropicmaterialdirectionscorrespondtotheelementcoordinatedirections.TheelementcoordinatesystemorientationisdescribedinCoordinateSystems.ElementloadsaredescribedinNodalLoading.PressuresmaybeinputassurfaceloadsontheelementfacesasshownbythecirclednumbersinFigure183.1:PLANE183Geometry.Positivepressuresactintotheelement.Temperaturesmaybeinputaselementbodyloadsatthenodes.ThenodeItemperatureT(I)defaultstoTUNIF.Ifallothertemperaturesareunspecified,theydefaulttoT(I).Ifallcornernodetemperaturesarespecified,eachmidsidenodetemperaturedefaultstotheaveragetemperatureofitsadjacentcornernodes.Foranyotherinputtemperaturepattern,unspecifiedtemperaturesdefaulttoTUNIF.Thenodalforces,ifany,shouldbeinputperunitofdepthforaplaneanalysis(exceptforKEYOPT(3)=3orKEYOPT(3)=5)andonafull360°basisforanaxisymmetricanalysis.AsdescribedinCoordinateSystems,youcanuseESYStoorientthematerialpropertiesandstrain/stressoutput.UseESYStochooseoutputthatfollowsthematerialcoordinatesystemortheglobalcoordinatesystem.Forthecaseofhyperelasticmaterials,theoutputofstressandstrainisalwayswithrespecttotheglobalCartesiancoordinatesystemratherthanfollowingthematerial/elementcoordinatesystem.KEYOPT(3)=5isusedtoenablegeneralizedplanestrain.Formoreinformationaboutthegeneralizedplanestrainoption,seeGeneralizedPlaneStrainintheElementReference.KEYOPT(6)=1setstheelementforusingmixedformulation.Fordetailsontheuseofmixedformulation,seeApplicationsofMixedu-PFormulationsintheElementReference.YoucanapplyaninitialstressstatetothiselementviatheINISTATEcommand.Formoreinformation,seeInitialStateintheBasicAnalysisGuide.Theeffectsofpressureloadstiffnessareautomaticallyincludedforthiselement.Ifanunsymmetricmatrixisneededforpressureloadstiffnesseffects,useNROPT,UNSYM.Thenexttablesummarizestheelementinput.ElementInputgivesageneraldescriptionofelementinput.ForaxisymmetricapplicationsseeHarmonicAxisymmetricElements.PLANE183InputSummaryNodesI,J,K,L,M,N,O,PwhenKEYOPT(1)=0I,J,K,L,M,NwhenKEYOPT(1)=1)DegreesofFreedomUX,UYRealConstantsNone,ifKEYOPT(3)=0,1,or2THK-ThicknessifKEYOPT(3)=3MaterialPropertiesTBcommand:SeeElementSupportforMaterialModelsforthiselement.MPcommand:EX,EY,EZ,PRXY,PRYZ,PRXZ(orNUXY,NUYZ,NUXZ),ALPX,ALPY,ALPZ(orCTEX,CTEY,CTEZorTHSX,THSY,THSZ),DENS,GXY,GYZ,GXZ,ALPD,BETDSurfaceLoadsPressures--face1(J-I),face2(K-J),face3(L-K),face4(I-L)whenKEYOPT(1)=0face1(J-I),face2(K-J),face3(I-K)whenKEYOPT(1)=1BodyLoadsTemperatures--T(I),T(J),T(K),T(L),T(M),T(N),T(O),T(P)whenKEYOPT(1)=0T(I),T(J),T(K),T(L),T(M),T(N)whenKEYOPT(1)=1Bodyforcedensities--TheelementvaluesintheglobalXandYdirections.SpecialFeaturesBirthanddeathElementtechnologyautoselectInitialstateLargedeflectionLargestrainLinearperturbationMaterialforceevaluationNonlinearstabilizationRezoningStressstiffeningKEYOPT(1)Elementshape:0--8-nodequadrilateral1--6-nodetriangleKEYOPT(3)Elementbehavior:0--Planestress1--Axisymmetric2--Planestrain(Zstrain=0.0)3--Planestresswiththickness(TK)realconstantinput5--GeneralizedplanestrainKEYOPT(6)Elementformulation:0--Usepuredisplacementformulation(default)1--Usemixedu-Pformulation(notvalidwithplanestress)PLANE183OutputDataThesolutionoutputassociatedwiththeelementisintwoforms:NodaldisplacementsincludedintheoverallnodalsolutionAdditionalelementoutputasshowninTable183.1:PLANE183ElementOutputDefinitions.SeveralitemsareillustratedinFigure183.2:PLANE183StressOutput.Theelementstressdirectionsareparalleltotheelementcoordinatesystem.AgeneraldescriptionofsolutionoutputisgiveninSolutionOutput.SeetheBasicAnalysisGuideforwaystoviewresults.Figure183.2:PLANE183StressOutputTheElementOutputDefinitionstableusesthefollowingnotation:Acolon(:)intheNamecolumnindicatesthattheitemcanbeaccessedbytheCompone