Impact With Rigid Tutorial
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Transcript of Impact With Rigid Tutorial
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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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2013 Hormoz Zareh 3 Portland State University, Mechanical Engineerin
5. IntheCreatePartdialogbox(shownabove)namethepartRigida. Select3Db. SelectAnalyticalrigidc. Setapproximatesize=200d. ClickContinue
6. Createthegeometryshownbelow(notdiscussedhere). Dimensionsareinmillimeters.
a. Settheextrusiondepthto200mm.
7. Createadatumpointatthecenteroftheplate(midwaybetweendiagonalpoints).
8. FromthemenubarselectToolsReferencePoint
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2013 Hormoz Zareh 4 Portland State University, Mechanical Engineerin
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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2013 Hormoz Zareh 7 Portland State University, Mechanical Engineerin
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.