ansys軟件計算大變形問題實例(Analysis-Large Deflection-Arched Beam)

Workshop7

NonlinearAnalysis-LargeDeflection

ArchedBeam7.NonlinearAnalysis-LargeDeflection

ArchedBeamDescriptionAshallowarchissubjectedtoa20,000Nforceatitsmidspan.Determinethemidspandisplacementusingbothalinearandnonlinear(large-deflection)analysis,thencomparetheresults.0012907.NonlinearAnalysis-LargeDeflection

ArchedBeamLoadsandMaterialProperties0012907.NonlinearAnalysis-LargeDeflection

ArchedBeam1. EnterANSYSintheworkingdirectoryspecifiedbyyourinstructorusing“beamarch”asthejobname.2. Werecommendbuildingthemodelusingsteps3-12,butifyoudon'twantto,youmayresumeanexistingdatabase(beamarch.db1),thenskiptostep13.UtilityMenu>File>Resumefrom…Orissue:RESUME,beamarch,db13. Define4keypointsintheglobalcylindricalsystem:kp1at(1270,75),kp2at(1270,90),kp3at(1270,105),kp4at(1270sin45,90).Kp4istheorientationkeypoint.UtilityMenu>WorkPlane>ChangeActiveCSto>GlobalCylindricalMainMenu>Preprocessor>-Modeling-Create>Keypoints>InActiveCS…UtilityMenu>Parameters>AngularUnits...Orissue:/PREP7CSYS,1K,1,1270,75K,2,1270,90K,3,1270,105*AFUN,DEGK,4,(1270*SIN(45)),900012907.NonlinearAnalysis-LargeDeflection

ArchedBeam4. Definelines

(arcs)fromkeypoints

1to2andkeypoints

2to3:MainMenu>Preprocessor>-Modeling-Create>-Lines-Lines>InActiveCoord+Orissue:L,1,2L,2,35. DefinetheelementtypetobeBEAM189,andthendefinematerialproperties(EX=210e3MPa):MainMenu>Preprocessor>ElementType>Add/Edit/Delete…MainMenu>Preprocessor>MaterialProps>-Constant-Isotropic...Orissue:ET,1,BEAM189MP,EX,1,210E36. ConstraintheUX,UY,andUZdirectionsatkeypoints1and3,andthenconstrainonlytheUZdirectionatkeypoint2:MainMenu>Preprocessor>Loads>-Loads-Apply>-Structural-Displacement>Onkeypoints+Orissue:DK,1,UX,0,,,UY,UZDK,3,UX,0,,,UY,UZDK,2,UZ,00012907.NonlinearAnalysis-LargeDeflection

ArchedBeam7. Applyaforceof20,000NinthenegativeYdirectionatkeypoint2:MainMenu>Preprocessor>Loads>-Loads-Apply>-Structural-Force/Moment>Onkeypoints+Orissue:FK,2,FY,-200000012907.NonlinearAnalysis-LargeDeflection

ArchedBeam8. Definethebeam'ssectionproperties:MainMenu>Preprocessor>Sections-Beam-CommonSectns…ID=1Sub-Type=<rectangle>Offset=CentroidB=25H=12.5Orissue:SECTYPE,1,BEAM,RECTSECOFFSET,CENTSECDATA,25,12.50012907.NonlinearAnalysis-LargeDeflection

ArchedBeam9. Assignattributes,includingtheorientationkeypoint,tothelines:MainMenu>Preprocessor>-Attributes-Define>AllLines...MAT=1TYPE=“1BEAM189”SECT=1PickOrientationKeypoint(s)=“yes”[OK]Pickkeypoint4,then[OK]Orissue:LATT,1,,1,,4,,10012907.NonlinearAnalysis-LargeDeflection

ArchedBeam10. Set10elementdivisionsonalllines:MainMenu>Preprocessor>-Meshing-SizeCntrls>-ManualSize--Lines-AllLines...Orissue:LESIZE,ALL,,,1011. Meshallthelines:MainMenu>Preprocessor>-Meshing-Mesh>Lines+Orissue:LMESH,ALL12. Turn/ESHAPEonandset/EFACETtotwo,andthenplottheelements:UtilityMenu>PlotCtrls>Style>SizeandShape...Orissue:/ESHAPE,1/EFACET,2EPLOT0012907.NonlinearAnalysis-LargeDeflection

ArchedBeam13. Savethedatabaseandobtainthelinearsolution:Pickthe“SAVE_DB”buttonintheToolbar(orselect:UtilityMenu>File>SaveasJobname.db)MainMenu>Solution>-Solve-CurrentLSOrissue:SAVE/SOLUSOLVE14. Selectnodenumber2(mid-spannode),

thenenterPOST1andprintthenodaldisplacements:UtilityMenu>Select>Entities...MainMenu>GeneralPostproc>ListResults>NodalSolution...Orissue:NSEL,S,,,2/POST1PRDISP0012907.NonlinearAnalysis-LargeDeflection

ArchedBeam15. Selecteverythingandenterthesolutionprocessortosolvethenonlinearsolution:UtilityMenu>Select>EverythingMainMenu>Solution>Sol’nControl..Activate“LargeDisplacementStatic”underAnalysisOptionsSetNumberofsubsteps=10[OK]MainMenu>Solution>-Solve-CurrentLSOrissue:ALLSEL/SOLUNLGEOM,1NSUBST,10SOLVE0012907.NonlinearAnalysis-LargeDeflection

ArchedBeam16. Listthedisplacementofnode2:UtilityMenu>Select>Entities...MainMenu>GeneralPostproc>ListResults>NodalSolution...Orissue:NSEL,S,,,2/POST1PRDISP0012907.NonlinearAnalysis-LargeDeflection

ArchedBeam17. Selecteverythingandsetdisplacementscalingto5,thenplottheUYdisplacementresults:UtilityMenu>Select>EverythingUtilityMenu>PlotCtrls>Style>DisplacementScaling…MainMenu>GeneralPostproc>PlotResults>-ContourPlot-NodalSolu…Orissue:ALLSEL/DSCALE,1,5PLNSOL,U,Y0012907.Nonlinear