2013 Hormoz Zareh 1 Portland State University, Mechanical Engineering

AbaqusCAE(ver.6.12)Impacttutorial

ProblemDescription

Analuminumpartisdroppedontoarigidsurface.Theobjectiveistoinvestigatethestressanddeformationsduringtheimpact.

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AnalysisSteps1. StartAbaqusandchoosetocreateanewmodeldatabase2. InthemodeltreedoubleclickonthePartsnode(orrightclickonpartsandselectCreate)

3. IntheCreatePartdialogbox(shownabove)namethepartBracket

a. Select3Db. SelectDeformablec. SelectSolidd. Setapproximatesize=200e. ClickContinue

4. Createthegeometryshownbelow(notdiscussedhere).Dimensionsareinmillimeters.a. Extrudetheshapetoadepthof20.

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5. IntheCreatePartdialogbox(shownabove)namethepartRigida. Select3Db. SelectAnalyticalrigidc. Setapproximatesize=200d. ClickContinue

6. Createthegeometryshownbelow(notdiscussedhere).Dimensionsareinmillimeters.

a. Settheextrusiondepthto200mm.

7. Createadatumpointatthecenteroftheplate(midwaybetweendiagonalpoints).

8. FromthemenubarselectToolsReferencePoint

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a. Selectthedatumpointjustcreated.b. Thereferencepointwillbecreatedas

shown.

9. Createasurfaceontherigidplate.a. ClickontheToolsSurfaceCreateb. Selecttherigidplate.c. Youwillbepromptedtopickasideforinternalfaces.Pickthecolorthatis

likelycandidateastheimpactsurface.Inthisexample,Brownhasbeenselected.

10. DoubleclickontheMaterialsnodeinthemodeltree

a. NamethenewmaterialAluminumandgiveitadescriptionb. ClickontheMechanicaltabElasticityElasticc. DefineYoungsModulusandthePoissonsRatio(useSI(mm)units)

i. Youngsmodulus=70e3,Poissonsratio=0.33d. Sincethisisanexplicitmodel,materialdensitymustalsobedefinede. ClickontheGeneraltabDensity

i. Density=2.6e6f. ClickOK

AFNote Erreur c'est 2.6e-9;

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11. DoubleclickontheSectionsnodeinthemodeltreea. Namethesectionbracket_secandselectSolidforthecategoryandHomogeneousforthetypeb. ClickContinuec. Selectthematerialcreatedabove(Aluminum)andClickOK

12. ExpandthePartsnodeinthemodeltree,expandthenodeofthepartBracket,anddoubleclickon

SectionAssignmentsa. SelecttheentiregeometryintheviewportandpressDoneinthepromptareab. Selectthesectioncreatedabove(bracket_sec)c. ClickOK

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13. ExpandtheAssemblynodeinthemodeltreeandthendoubleclickonInstancesa. SelectDependentfortheinstancetypeb. Selecttheparts:Bracketandrigidc. SelectAutooffsetfromotherinstancesd. ClickOK

14. Now,rotatethebracketsothattheimpactwilloccuratthelowerrightcorner.Thiswillbaaccomplishedbyrotatingtheobjectfirstwithrespecttothezaxisfollowedbyrotationaboutxaxis.

a. SelectRotateInstanceicon.b. SelecttheBracketc. Acceptthedefaultvaluesofstartingpoint(0,0,0)bypressingEnterd. Enter(0,0,1)fortheendpointofrotationaxis.e. Enter15(degrees)forAngleofRotation.

Theassemblyshouldlooksimilartothescreenshotbelow.BesuretoconfirmthefinalrotatedpositionbyclickingonOKatthepromptregion!

15. Now,rotatethebracketaboutthexaxis.a. SelectRotateInstanceicon.b. SelecttheBracketc. Acceptthedefaultvaluesofstartingpoint(0,0,0)bypressingEnterd. Enter(1,0,0)fortheendpointofrotationaxis.e. Enter15(degrees)forAngleofRotation.Besuretoconfirmthefinalrotatedpositionby

clickingonOKatthepromptregion!

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Theassemblyshouldlooksimilartothescreenshotbelow.

16. InthetoolboxareaclickontheTranslateInstanceicona. SelecttheBracketgeometry,clickDoneb. Selectthebottomcornerofthebracketasshown.c. SelectthereferencepointontheRigidmemberastheendpoint.d.

ClickOk

e. Thecompletedassemblyshouldnowlooklikeisshownbelow.

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17. DoubleclickontheStepsnodeinthemodeltreea. Namethestep,settheproceduretoGeneral,selectDynamic,

Explicit,andclickContinueb. OntheEditSteppageundertheBasictab,setthetime

periodto0.02seconds.

18. DoubleclickontheBCsnodeinthemodeltreea. Nametheboundaryconditionfix_rigid_plateandselect

Symmetry/Antisymmetry/Encastreforthetype.b. SelectthereferencepointonthebracketgeometryandclickDonec. SelectENCASTREfortheboundaryconditionandclickOK

19. OpenFieldOutputRequestsnodeinthemodeltree

a. DoubleclickontheFOutput1.b. ChangethevalueofIntervalto100.Thisallowsfor

capturingofmoreoutputincrementssothatimpactcanbebettervisualized.

c. YoumaywishtoalsochangetheHistoryoutputRequeststoallowforbetterresolutionofhistoryoutputplots.

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20. SelecttheCreatePredefinedFieldiconundertheLoadmodule.a. Namethepredefinedfield.b. PullldownInitialstepundertheStepselection(seefigure).c. SettheCategorytoMechanicalandbesureVelocityisselected.d. Notethepromptregionasksyoutoselecttheregions.

e. Rotatetheimageonthescreensothatthebracketcanbehighlighted.Besuretherigidplateisnotselected!

f. ClickDoneinthepromptregion.g. Whenprompted,Enter500[mm/s]intheV2fieldoftheEditPredefinedFieldwindow.The

velocityvectorsshouldnowbedisplayedonthescreen.

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21. DoubleclickontheInteractionPropertiesnodeinthemodeltreea. NametheinteractionpropertiesandselectContactforthetype,clickContinue

b. OntheMechanicaltabSelectTangentialBehavior

i. SetthefrictionformulationtoPenaltyii. SetFrictionCoefficientto0.5

c. OntheMechanicaltabSelectNormalBehaviord. Acceptdefaults,

ClickOK

22. DoubleclickontheInteractionsnodeinthemodeltreea. Nametheinteraction,selectGeneralContact(Explicit)

(Explicit)andclickContinueb. SelectAll*withselfontheEditInteractionsWindow.c. Besuretoassigntheappropriateinteractionpropertyunder

GlobalPropertyassignmentintheContactPropertiestabofthewindow.

d. Changethecontactinteractionpropertiestotheonecreatedabove(ifnotalreadydone)

e. ClickOK

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23. OpentheFieldOuput1andchangetheIntervalfortheoutputrequestto100.

24. InthemodeltreedoubleclickonMeshfortheBracketpart,orusetheModulesectionoftheiconpanelasshown.

a. SelectExplicitforelementtypeb. SelectQuadraticforgeometricorderc. Select3DStressforfamilyd. SelectTettabandbesuretheelementisC3D10Me. SelectOK

YoumaychecktheMeshControltobesureonlyTETelementsarebeingusedinmeshing.

25. InthetoolboxareaclickontheSeedParticon

a. UnderSizingControlssetApproximateglobalsizeto2,ClickOK

26. InthetoolboxareaclickontheMeshParticon

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a. ClickYes

Caution:Themeshwillexceedtheabilityofstudentversionofthesoftwaretosolve.YouneedtouseeitherAcademicversionortheResearchversiontobeabletorunthejob.

27. InthemodeltreedoubleclickontheJobnode

a. Namethejobb. Givethejobadescription,clickContinuec. Acceptdefaults,clickOK

28. InthemodeltreerightclickonthejobjustcreatedandselectSubmit

a. WhileAbaqusissolvingtheproblemrightclickonthejobsubmitted,andselectMonitorb. IntheMonitorwindowcheckthattherearenoerrorsorwarnings

i. Ifthereareerrors,investigatethecause(s)beforeresolvingii. Iftherearewarnings,determineifthewarningsarerelevant,somewarningscanbesafely

ignored.Anexampleisinformationwarningmessagebelow:Theoption*boundary,type=displacementhasbeenused;checkstatusfilebetweenstepsforwarningsonanyjumpsprescribedacrossthestepsindisplacementvaluesoftranslationaldof.Forrotationaldofmakesurethattherearenosuchjumps.Alljumpsindisplacementsacrossstepsareignored

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29. Inthemodeltreerightclickonthesubmittedandsuccessfullycompletedjob,andselectResults30. 31. Toseetheeffectofimpact,youcaneitheranimatethedeformedshape,orstepthrougheachtimestepof

thesolution.Herethestepbystepmethodisdiscussed.a. Inthetoolboxareaclickonthefollowingicons

i. PlotContoursonDeformedShapeii. SwitchtotheFirststepofthesolution.iii. ClickontheNextstep.iv. Repeatafewtimesandobservethechangeinthestresscontours,and

alsobesurethecontactdoesnotextendintotherigidsurface.YouallalsonoticethattheBracketwillstarttoseparatefromtherigidplate!

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32. Youmayalsowishtoseethebehaviorofthesystemenergy,specificallymakingsuretheartificialstrainenergyisnotasubstantialpercentageoftheoverall(Internal)energyofthesystem.

a. ClickontheCreateXYDataicon.b. BesuretheSourceisODB

HistoryoutputthenclickContinue

c. HoldtheCTRLkeyandselecttheenergytermsyouwishtoplot.IN theexamplebelowInternalandArtificalenergy termshavebeenselected.

YoullnotethatArtificialEnergyisaverysmallportionoftheoverallInternalEnergy,thusthemodelseemstobevalid,atleastfromthestandpointofelementbehaviorandpossibilityoferrorsduetomeshing.