有限元分析作业报告 英文版.docx

有限元分析作业报告 英文版.docx

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有限元分析作业报告英文版

有限元分析及应用

上机实验报告

学院：

机电工程学院

专业：

机械工程

班级：

硕士1606班

******

学号：

*********

*******

日期：

2016.12.02

1.Question

Fig.1.Schematicdiagramofherringbonerooftruss.

Question:

ThegeometricdimensionsofthechevronroofisshowninFig.1,youshouldanalyzeitbystatics，asaresultyoushouldgivethedisplacementandaxialforceandaxialforcediagramofthedeformationdiagram.

Conditions:

Theendsoftherooftrusswerefixed,thesectionalareaofthetrussis0.01m2,elasticmodulusis2.0×1011N/m2,poisson'sratiois0.3.

2.Thesoftwareused

ANSYSFiniteelementsoftware（APDL15.0）

3.Solvingprocess

Point1waschoosedastheCoordinatepoint,horizontaltotherightwastheXaxis，theuprightdirectionischoosedastheYaxistocreateacoordinatesystem.ThenodeswasnumberedasshowninFigure1，node1andnode5wasfixed，andtheforceonnode6,7,8wasis1kN，thedirectionisoppositetotheY-axis

3.1Thepreparatoryworkbeforeanalysis

（1）Specifythenewfilename.SelectUtility>Menu>File>ChangeJobname,thenpop-upthedialogboxChangeJobname,inputthetheworkingfilename‘2D-sp’intheEnterNewJobname,clickOKtofinishthedifinition,asshowninFig.2.

Fig.2.Thedifinitionofworkingfilename.

（2）Specifyanewtitle.SelectUtility>Menu>File>ChangeTitle，thenpop-upthedialogboxChangeTitle,inputthethefilename‘2D-sppro’intheEnterNewTitle,clickOKtofinishthedifinition,asshowninFig.3.

Fig.3.Thedifinitionoffilename.

（3）Re-refreshthegraphicswindow.SelectUtility>Menu>Plot>Replot,thedefinedinformationwasdisplayedinthegraphicswindow.

（4）Definethestructuralanalysis.RunthemainmenuMainMenu>Preferences，thenchoosetheStructural,clickOKtocompletethedefinitionoftheanalysistype,asshowninFig.4.

Fig.4.Thedefinitionofthestructuralanalysis.

3.2Definetheelementtype

RunthemainmenuMainMenu>Preprocessor>ElementType>Add,thenpop-upthedialogboxElementTypes,clickthebuttonAddtobuildanewelementtype,thenpop-upthedialogboxLibraryofElementTypes,chooseLinkfirst,andthenselect3Dfinitstn180（Link1），clickthebuttonOKtofinishthedefinitionoftheelementtype,clickthebuttonClosetofinishthesettings,asshowninFig.5.

Fig.5.Thedefinitionoftheelementtype.

3.3Definetherealconstants

RunthemainmenuMainMenu>Preprocessor>RealConstantsAdd,thenpop-upthedialogboxofrealconstants,clickthebuttonAddtocomeintotheconstantinputdialogbox,asshowninFig.6.Inputthesectionalareaofthetruss（0.01m2）inAREA,clickthebuttonOKtofinishtheinputoftherealconstants,asshowninFig.7.

Fig.6.Getintotheinstanceconstantdialogbox.

Fig.7.Thedefinitionoftherealconstants.

3.4Definethematerialproperties

RunthemainmenuMainMenu>Preprocessor>MaterialProps>MaterialModels,thenpop-upthedialogboxofmaterialproperties,andselectStructure、Linear、Elastic、Isotropic,asshowninFig.8.

Whentheselectionwascompleted,appearedtheMaterialPropertiesinputdialogboxappears，theninputelasticmodulus2e11andthepoisson'sratio0.3,asshowninFig.9,clickOKtofinishtheinputofthematerialproperties.

Fig.8.Getintothesettingofmaterialproperties.

Fig.9.Thedifinitionofthematerialproperties.

3.5Establishtheanalyticalmodel

（1）Createthenodes.Thecoordinatesofthe1—8nodesasshowninTable.1.RunthemainmenuMainMenu>Preprocessor>Modeling>Create>Nodes>InActiveCS.ThecreatenodeentrydialogboxappearsasshowninFig.10.Inputthefirstnode1andits’x,y,zcoordinate,thenclickApplytofinishthecreatingofthenode.Similarly,createthenodes2—8,clickOKtofinishthecreatingofthenodes,asshowninFig.10.

Table.1.Thecoordinatesofgeometrymodelnodes.

Nodes

1

2

3

4

5

6

7

8

Coordinates

（0,0,0）

（2,0,0）

（4,0,0）

（6,0,0）

（8,0,0）

（6,1,0）

（4,2,0）

（2,1,0）

Fig.10.Thedialogboxofnodesinput.

Fig.11.Thecreationofthenodes.

Thecreatednodesasshownbelow：

（2）Createdthebarunit

RunthemainmenuMainMenu>Preprocessor>Modeling>Create>Elements>AutoNumbered>ThruNodes,thenpop-upthedialogboxElementfromNodes,pickthenodes1and2,clickApplytocompletethefirstleverunit.Similarly,pickbothendsoftherodinturn,clickApplytocompletetheleverunit,lastlyclickOK,asshowninFig.12.

Fig.12.Modelestablishmentoftheherringbonetruss.

3.6Applyconstraintsandloads

（1）Imposeconstraints

RunthemainmenuMainMenu>Solution>DefineLoads>Apply>Structural>Displacement>OnNodes,thepickmenuappears,selectnodes1and5inturn,thenclickOK,theconstraintdefinitiondialogboxappears，asshowninFig.13.ChooseAllDOFtoconstrainalldegreesoffreedom，otheritemsbydefault，thenclickthebuttonOKtocompletetheconstraintdefinition.

Fig.13.Imposetheconstraints.

（2）Applytheload

RunthemainmenuMainMenu>Solution>DefineLoads>Apply>Structural>Force/Moment>OnNodes,thepickmenuappears,selectnodes6,7and8inturn,clickOK,thentheloaddefinitionsdialogboxappears，asshowninFig.14.TheloadtypeisconcentratedforceFY.Thevalueis-1000,ThenclicktheOKbuttontocompletetheapplicationoftheload.

Fig.14.Theapplicationoftheload.

Figureafterloadapplicationasshownbelow:

3.7Solution

RunthemainmenuMainMenu>Solution>Solve>CurrentLS,thenpop-upthedialogboxSolveCurrentLoadStep,clickSTATCommand,thenclickSTATCommand>File>ClosetoclosetheSTATCommandwindow,thenclickOKtofinishthesteps.Thenthecomputerstartedthesolution.Thepromptionof"Solutionisdone"indicatedthatthesolutionwascompleted,clickthebuttonClosetofinishthesolution,asshowninFig.15.

Fig.15.Theprocessofthesolution.

3.8Viewtheanalysisresults

（1）Definethecelltable.InANSYS,somedatacannotbedirectlyaccessed,soweneedtocompletethedefinitionofcelltoaccesstheresults.

RunthemainmenuMainMenu>GeneralPostproc>ElementTable>DefineTable,thenpop-upthedialogbox,clickthebuttonAdd.Theunittabledefinitiondialogboxappeared,asshowninFig.16.

Fig.16a.Thedefinitionofthecelltable.

Fig.16b.Thedefinitionofthecelltable.

（2）Displaytheaxialforce（axialstress）diagram.RunthemainmenuMainMenu>GeneralPostproc>PlotResults>ContourPlot>ElemTable.Thenpop-upthecelltableresultselectiondialogbox,asshowninFig.17.ChooseA-STRandclickOKtoviewtheaxialforce（axialstress）diagram,asshowninFig.18.

Fig.17.ContorplotofElementTableData.

（3）Displaytheresult.TheresultasshowninFig.18.

Fig.18.Thefinalresult.