plasticity tutorial ver 611
TRANSCRIPT
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8/10/2019 Plasticity Tutorial Ver 611
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2012 Hormoz Zareh & Jenna Bell 1 Portland State University, Mechanical Engineering
Abaqus/CAE(ver.6.11)Material Nonlinearity Tutorial
ProblemDescription
A rectangular steel cantilevered beam has a downward load applied to one end. The load is expected to
produce plastic deformation. An experimentally determined stress strain curve was supplied for the steelmaterial. We will investigate the magnitude and depth of plastic strain.
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8/10/2019 Plasticity Tutorial Ver 611
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2012 Hormoz Zareh & Jenna Bell 2 Portland State University, Mechanical Engineering
AnalysisSteps1. StartAbaqusandchoosetocreateanewmodeldatabase
2. InthemodeltreedoubleclickonthePartsnode(orrightclickonpartsandselectCreate)
3. IntheCreatePartdialogbox(shownabove)namethepartand
a. Select2DPlanar
b. SelectDeformable
c. SelectShell
d. Setapproximatesize=200
e. ClickContinue
4. Createthegeometryshownbelow(notdiscussedhere)
5. DoubleclickontheMaterialsnodeinthemodeltree
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8/10/2019 Plasticity Tutorial Ver 611
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2012 Hormoz Zareh & Jenna Bell 3 Portland State University, Mechanical Engineering
a. Namethenewmaterialandgiveitadescription
b.
Thestressstraindata,shownbelow,wasmeasuredforthematerialused
i.
Thisdataisbasedonthenominal(engineering)stressandstrain
NominalStress(Pa) NominalStrain
0.00E+00 0.00E+00
2.00E+08 9.50E04
2.40E+08 2.50E02
2.80E+08 5.00E02
3.40E+08 1.00E01
3.80E+08 1.50E01
4.00E+08 2.00E01
ii. Abaqusexpectsthestressstraindatatobeenteredastruestressandtrueplasticstrain
1. Inadditionthemodulusofelasticitymustcorrespondtotheslopedefinedbythe
firstpoint(theyieldpoint).
iii.
Toconvert
the
nominal
stress
to
true
stress,
use
the
following
equation
1. 1
iv. Toconvertthenominalstraintotruestrain,usethefollowingequation
1.
1
v. Tocalculatethemodulusofelasticity,dividethefirstnonzerotruestressbythefirstnonzero
truestrain
vi. Toconvertthetruestraintotrueplasticstrain,usethefollowingequation
1.
vii. Theresultsshouldbe
True
Stress
(Pa) Plastic
Strain Elastic
Modulus
(Pa)
2.002E+08 0.000E+00 2.1073E+11
2.460E+08 2.353E02
2.940E+08 4.740E02
3.740E+08 9.354E02
4.370E+08 1.377E01
4.800E+08 1.800E01
0.00E+00
1.00E+08
2.00E+08
3.00E+08
4.00E+08
6.38E16 2.50E02 5.00E02 7.50E02 1.00E01 1.25E01 1.50E01 1.75E01 2.00E01
NominalStress(Pa)
NominalStrain
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8/10/2019 Plasticity Tutorial Ver 611
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2012 Hormoz Zareh & Jenna Bell 4 Portland State University, Mechanical Engineering
c. ClickontheMechanicaltabElasticityElastic
i.
Enterthecalculatedmodulusofelasticity,andPoisonsratioof0.3
d.
ClickontheMechanicaltabPlasticityPlastic
i. Enterthecalculatedtruestressandplasticstrain
1. NotethatyoucansimplycopyyourcalculatedvaluesfromExcel(orsimilar)and
pastethemintoAbaqus
e.
ClickOK
6.
Doubleclick
on
the
Sections
node
in
the
model
tree
a.
NamethesectionPlaneStressPropertiesandselectSolidforthecategoryandHomogeneous
forthetype
b. ClickContinue
c. Selectthematerialcreatedabove(Steel)andsetthethicknessto5.
d. ClickOK
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2012 Hormoz Zareh & Jenna Bell 5 Portland State University, Mechanical Engineering
7.ExpandthePartsnodeinthemodeltree,expandthenodeofthepartjustcreated,anddoubleclickon
SectionAssignments
a.
SelecttheentiregeometryintheviewportandpressDoneinthepromptarea
b. Selectthesectioncreatedabove(PlaneStressProperties)
c. VerifyFromsectionisselectedunderThickness
d. ClickOK
8. ExpandtheAssemblynodeinthemodeltreeandthendoubleclickonInstances
a.
SelectDependentfortheinstancetype
b. ClickOK
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2012 Hormoz Zareh & Jenna Bell 6 Portland State University, Mechanical Engineering
9.DoubleclickontheStepsnodeinthemodeltree
a.
Namethestep,settheproceduretoGeneral,and
selectStatic,General
b. OntheBasictab,givethestepadescriptionand
changethetimeperiodto2
i. Forthisanalysisneglecttheeffectsof
geometricnonlinearities
(Nlgeom
=Off)
c. OntheIncrementation tab,
i. Settheinitialincrementsizeto0.05
ii. Setthemaximumincrementsizeto0.2
d. ClickOK
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2012 Hormoz Zareh & Jenna Bell 7 Portland State University, Mechanical Engineering
10.DoubleclickontheBCsnodeinthemodeltree
a.
NametheboundaryconditionedFixedandselect
Symmetry/Antisymmetry/Encastreforthetype
b. SelecttheleftedgeandclickDone
c. SelectENCASTREfortheboundarycondition
d. ClickOK
11.DoubleclickontheAmplitudesnodeinthemodeltree
a. NametheamplitudeTriangularLoadingandselectTabular
b.
Enterthedatapointsshownbelow
i.
Abaqusmultipliestheloadmagnitudebytheamplitudedefinition,therefore0isnoloadand
1isthefullload
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2012 Hormoz Zareh & Jenna Bell 8 Portland State University, Mechanical Engineering
12.
DoubleclickontheLoadsnodeinthemodeltree
a. NametheloadandselectSurfacetractionasthetype
b.
Selectthe
right
edge
c. UnderDirection,clickonthearrowandselecttheupperrightcornerasthefirstpoint,andthe
lowerrightcornerasthesecondpoint
d. Forthemagnitude,enter5e6
e. Fortheamplitude,selecttheamplitudecreatedabove(Triangularloading)
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8/10/2019 Plasticity Tutorial Ver 611
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2012 Hormoz Zareh & Jenna Bell 9 Portland State University, Mechanical Engineering
13. InthemodeltreedoubleclickonMeshforthebeampart,andin
thetoolboxareaclickontheAssignElementTypeicon
a.
Selecttheentiregeometry
b. SelectStandardforelementtype
c. SelectQuadraticforgeometricorder
d. SelectPlanestressforfamily
e.
Notethat
the
name
of
the
element
(S4R)
and
its
description
aregivenbelowtheelementcontrols
f. SelectOK
14. InthetoolboxareaclickontheAssignMeshControlsicon
a. Selecttheportionofthegeometryassociatedwiththeboundaryconditionsandload
b. ChangetheelementshapetoQuad
c. SetthetechniquetoStructured
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8/10/2019 Plasticity Tutorial Ver 611
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2012 Hormoz Zareh & Jenna Bell 10 Portland State University, Mechanical Engineering
15. InthetoolboxareaclickontheSeedEdgesicon
a.
Selecttheleftandrightedges,clickDone
b.
SelectBynumber
c. SetBiastoNone
d. UnderSizingControlsenter8elements,ClickOK
16. InthetoolboxareaensuretheSeedEdgesiconis
stillselected
a.
Selectthetopandbottomedges
b.
SetMethod
to
By
number
and
Bias
to
Single
c. Setthenumberofelementsto50
d. Setthebiasratioto2
e.
Thebiasarrowspointtowardsthedirectionofthesmallerelements,sointhiscasetheyshouldpoint
totheleft. Iftheydont,clicktheSelectbuttonlocatedtotherightofFlipBias
f.
SelectthetopandbottomedgesandselectDone
g. Thearrowsshouldnowpointtotheleft
h. ClicktheOKbutton
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2012 Hormoz Zareh & Jenna Bell 11 Portland State University, Mechanical Engineering
17. InthetoolboxareaclickontheMeshParticon
18. InthemodeltreedoubleclickontheJobnode
a. Namethejobplastic_beam
b.
Givethejobadescription
19. InthemodeltreerightclickonthejobjustcreatedandselectSubmit
a. WhileAbaqusissolvingtheproblemrightclickonthejobsubmitted,andselectMonitor
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8/10/2019 Plasticity Tutorial Ver 611
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2012 Hormoz Zareh & Jenna Bell 12 Portland State University, Mechanical Engineering
b. IntheMonitorwindowcheckthattherearenoerrorsorwarnings
i.
Ifthereareerrors,investigatethecause(s)beforeresolving
ii.
Iftherearewarnings,determineifthewarningsarerelevant,somewarningscanbesafely
ignored
iii. Inthefarrightcolumn,notehowAbaqusadjustedtheincrement
20. Inthemodeltreerightclickonthesubmittedandsuccessfullycompletedjob,andselectResults
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2012 Hormoz Za
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