FEASIMULATION

• ModelSpecifications

• Abaqus Modelling

• TypesofModels

• AnalysisofFEAResults

1

MODELSPECIFICATIONS

254X100

2

MODELSPECIFICATIONS(CONTD.)

Dimensions

3

MODELSPECIFICATIONS(CONTD.)

Materials

1. Plies– Kevlar49/Epoxy(102,103,

105,106)

2. Core– NomexHoneycomb(104)

(AramidFibre,PhenolicCoated)

3. Cohesive(0.001mmlayers)

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MODELSPECIFICATIONS(CONTD.)Plies- Kevlar49/epoxy

Elastic(MPa)

E1 E2 E3 Nu12 Nu13 Nu23 G12 G13 G23

76000 5500 5500 0.34 0.34 0.4 2300 2300 1800

Hashin Damage(MPa)

Longitudinal TensileStrength

LongitudinalCompressiveStrength

TransverseTensileStrength

TransverseCompressiveStrength

Longitudinal ShearStrength

TransverseShearStrength

1400 235 12 53 34 34

DamageEvolution(kN)

Longitudinal TensileFractureEnergy

Longitudinal CompressiveFractureEnergy

TransverseTensileFractureEnergy

TransverseCompressiveFractureEnergy

117.8 52.8 0.3 0.8

• Continuum ShellElement

MaterialProperties

5

MODELSPECIFICATIONS(CONTD.)Core– Nomex Honeycomb (AramidFibre,PhenolicCoated)

Elastic(MPa)

E1 E2 E3 Nu12 Nu13 Nu23 G12 G13 G23

0.1 0.1 60 0 0 0 0.1 25 17

• Solid (3DStress),Homogeneous Element

MaterialProperties

6

MODELSPECIFICATIONS(CONTD.)

CohesiveBehavior (MPa)

Knn Kss Ktt

1,000,000 800,000 800,000

QuadsDamage(MPa)

NominalStressNormal-onlymode NominalStressFirstDirection NominalStressSecondDirection

30 60 60

DamageEvolution(kN)(PowerBK=1)

NormalModeFractureEnergy ShearModeFractureEnergyFirstDirectionShearModeFractureEnergySecond

Direction

0.2 0.8 0.8

Cohesive

• CohesiveElement

MaterialProperties

7

ABAQUSMODELLING

• 7 Modules:

1. Part

2. Property

3. Assembly

4. Step

5. Load

6. Mesh

7. Job

8

ABAQUSMODELLING(CONTD.)1.PART

Partitions

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ABAQUSMODELLING(CONTD.)2.PROPERTY&ASSEMBLY

10

ABAQUSMODELLING(CONTD.)3.STEP&LOAD

Supports(200mmapart)

3-PointBending

11

ABAQUSMODELLING(CONTD.)3.STEP&LOAD

12

Modelledasa‘half’symmetricmodeltosimplifycomputationandresultsanalysis

ABAQUSMODELLING(CONTD.)4.MESH

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TYPESOFMODELS

1. Unrepaired(Undamaged)

2. CircularStep-Sanded

3. CircularTaper-Sanded

4. RectangularStep-Sanded

A. 102and103

B. 102,103,&104

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TYPESOFMODELS(CONTD.)1.UNREPAIRED

Dimensions:200mmx50mm

Plies:0.254mmthick

Core:9.525mmthick

CohesiveElement:0.001mmthick

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TYPESOFMODELS(CONTD.)2.CIRCULARSCARFED

CircularStep-Sanded CircularTaper-Sanded

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CircularPatch(102):R25.4mm

TYPESOFMODELS(CONTD.)3.RECTANGULARSCARFED

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ANALYSISOFRESULTS18

ANALYSISOFRESULTS19

• Reactionforceattheloadingnodesü PlotofForcevs.Displacement

ü Damageon1st ply(102)

• Maximumforceforvariousmodelscompared

• Otherresultsstudied:ü Stressesanddamagepatternsonplies,patches,

cohesiveelementsandhoneycombcore

ANALYSISOFRESULTS(CONTD.)20

1.UNREPAIREDMODEL

ANALYSISOFRESULTS(CONTD.)21

605N

1.UNREPAIREDMODEL

ANALYSISOFRESULTS(CONTD.)22

2.CIRCULARSCARFEDMODEL

ANALYSISOFRESULTS(CONTD.)23

610N

2.CIRCULARSCARFEDMODEL

ANALYSISOFRESULTS(CONTD.)24

3.RECTANGULARSCARFEDMODEL

ANALYSISOFRESULTS(CONTD.)25

548N

3.RECTANGULARSCARFEDMODEL

ANALYSISOFRESULTS(CONTD.)26

SUMMARY

MAXIMUMLOAD(kN)

UndamagedPanel RepairedPanel(CircularScarfed)RepairedPanel

(RectangularScarfed)

0.605 0.610 0.548

CONCLUSION

ü Theoptimumrepairmethodandparametersweredeterminedandvalidated

ü SimulatevariousmodelsusingFEAtodeterminetheoptimummodelandparametersforthechosenrepairmethod– [scarfrepair](NUS&PKU)

ü Theoptimumrepairmethodwasvalidated(foritsmechanicalperformance)byfabricatingthemodelandconducting3-pointbendingtest(UofT )

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