7/27/2019 Impact With Rigid Tutorial

1/142013 Hormoz Zareh 1 Portland State University, Mechanical Engineerin

AbaqusCAE(ver.6.12)ImpacttutorialProblemDescription

Analuminumpartisdroppedontoarigidsurface.Theobjectiveistoinvestigatethestressanddeformationsduring

theimpact.

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2013 Hormoz Zareh 2 Portland State University, Mechanical Engineerin

AnalysisSteps1. StartAbaqusandchoosetocreateanewmodeldatabase2. InthemodeltreedoubleclickonthePartsnode(orrightclickonpartsandselectCreate)

3. IntheCreatePartdialogbox(shownabove)namethepartBracketa. 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

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

12.ExpandthePartsnodeinthemodeltree,expandthenodeofthepartBracket,anddoubleclickonSectionAssignments

a. 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. Enter 15(degrees)forAngleofRotation.

Theassemblyshouldlooksimilartothescreenshot

below.Besuretoconfirmthefinalrotatedposition

byclickingonOKatthepromptregion!

15.Now,rotatethebracketaboutthexaxis.a. SelectRotateInstanceicon.b. SelecttheBracketc. Acceptthedefaultvaluesofstartingpoint(0,0,0)bypressingEnterd. Enter(1,0,0)fortheendpointofrotationaxis.e. Enter 15(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,andclickContinue

b. OntheEditSteppageundertheBasictab,setthetimeperiodto0.02seconds.

18.DoubleclickontheBCsnodeinthemodeltreea. Nametheboundaryconditionfix_rigid_plateandselect

Symmetry/Antisymmetry/Encastreforthetype.

b. SelectthereferencepointonthebracketgeometryandclickDonec. SelectENCASTREfortheboundaryconditionandclickOK

19.Open FieldOutputRequestsnodeinthemodeltreea. DoubleclickontheFOutput1.b. ChangethevalueofIntervalto100.Thisallowsfor

capturingofmoreoutputincrementssothatimpact

canbebettervisualized.

c. YoumaywishtoalsochangetheHistoryoutputRequeststoallowforbetterresolutionofhistory

outputplots.

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

e. Rotatetheimageonthescreensothatthebracketcanbehighlighted.Besuretherigidplateisnotselected!

f. ClickDoneinthepromptregion.g. Whenprompted,Enter 500[mm/s]intheV2fieldoftheEditPredefinedFieldwindow.The

velocityvectors

should

now

be

displayed

on

the

screen.

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21.DoubleclickontheInteractionPropertiesnodeinthemodeltreea. NametheinteractionpropertiesandselectContactforthetype,clickContinue

b. OntheMechanicaltabSelectTangentialBehaviori. SetthefrictionformulationtoPenaltyii. SetFrictionCoefficientto0.5

c. OntheMechanicaltabSelectNormalBehaviord. Acceptdefaults,

ClickOK

22.DoubleclickontheInteractionsnodeinthemodeltreea. Nametheinteraction,selectGeneralContact(Explicit)

(Explicit)andclickContinue

b. SelectAll*withselfontheEditInteractionsWindow.c. Besuretoassigntheappropriateinteractionpropertyunder

GlobalPropertyassignmentintheContactPropertiestabof

thewindow.

d. Changethecontactinteractionpropertiestotheonecreatedabove(ifnotalreadydone)

e. ClickOK

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23.OpentheFieldOuput1andchangetheIntervalfortheoutputrequestto100.

24. InthemodeltreedoubleclickonMeshfortheBracketpart,orusetheModulesectionoftheiconpanelasshown.

a. SelectExplicitforelementtypeb.

Select

Quadratic

for

geometric

order

c. Select3DStressforfamilyd. SelectTettabandbesuretheelementisC3D10Me. SelectOK

YoumaychecktheMeshControltobesureonlyTETelements

arebeingusedinmeshing.

25. InthetoolboxareaclickontheSeedParticona. UnderSizingControlssetApproximateglobalsizeto2,ClickOK

26. InthetoolboxareaclickontheMeshParticon

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a. ClickYes

Caution: Themeshwillexceedtheabilityofstudentversionofthe

softwaretosolve.YouneedtouseeitherAcademicversionorthe

Researchversiontobeabletorunthejob.

27. InthemodeltreedoubleclickontheJobnodea. Namethejobb. Givethejobadescription,clickContinuec.

Accept

defaults,

click

OK

28. InthemodeltreerightclickonthejobjustcreatedandselectSubmita. WhileAbaqusissolvingtheproblemrightclickonthejobsubmitted,andselectMonitorb.

In

the

Monitor

window

check

that

there

are

no

errors

or

warnings

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. Inthetoolboxareaclickonthefollowingiconsi.Plot

Contours

on

Deformed

Shape

ii. SwitchtotheFirststepofthesolution.iii. ClickontheNextstep.iv. Repeatafewtimesandobservethechangeinthestresscontours,and

alsobesurethecontactdoesnotextendintotherigidsurface.Youallalsonoticethatthe

Bracketwillstarttoseparatefromtherigidplate!

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32.Youmayalsowishtoseethebehaviorofthesystemenergy,specificallymakingsuretheartificialstrainenergyisnotasubstantialpercentageoftheoverall(Internal)energyofthesystem.

a. ClickontheCreateXYDataicon.b. BesuretheSourceisODB

Historyoutputthenclick

Continue

c. HoldtheCTRLkeyandselecttheenergy

terms

you

wish

to

plot.

IN

the

example

belowInternalandArtificalenergy termshave

beenselected.

YoullnotethatArtificialEnergyisaverysmallportionoftheoverallInternalEnergy,thusthemodel

seemstobevalid,atleastfromthestandpointofelementbehaviorandpossibilityoferrorsdueto

meshing.