Download - Digimat Virtual Allowables, to complement physical testing of composite coupons

Digima-VA live demo JEC Paris 2015

Digimat Virtual Allowables

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Focus on coupon levelNeed to cover different Coupon type (unnotched, open hole, )Layup (quasi-iso, soft, hard, )Environment conditionsNeed of a statistical evaluation of the material properties (e.g. B-basis)Batch, process, variability

Required experimental testing can become gargantuanWhich minimum test matrix?Which sampling for B-basis?CFRP characterization is an expensive task

Source: DOT/FAA/AR-06/53

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Copyright 2014 e-Xstream engineering

Virtually exploreAny desired layupAny geometry choiceSensivity to any model parameter prior to experimental campaign

Simulation of coupon testing can improve the efficiency of experimental testing Test definitionOHT, OHC, UNTMaterialsLayupsVariabilityAllowables

Experimental test campaignTest simulationFEA + Progressive FailureVirtual AllowablesNeed of accurateMaterial modelingFEA modeling

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Mean-field homogenization combinesFiber anisotropic stiffness and strengthMatrix stiffness and strengthFiber microstructure (volume fraction, orientation)

To predict and model ply propertiesStiffnessStrengthMean-field homogenization accurately describes the ply response based on constituent behavior

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Predicted ply strength feed a failure indicatorEx Hashin 2D/3D

Used to compute damage parameters Ex Matzenmiller 2D/3D

Used to degrade the stiffness matrixMean-field homogenization can be combined with MLT theory to account for various damage mechanisms

Fiber failure tension/compressionMatrix failureTension/compression

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Multiscale material model used via user subroutine of FEA solverCoupon response is predicted via a coupled finite element analysis

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Prediction of an open hole tension coupon strength is achievable thanks to progressive failure analysis

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A Digimat Progressive Failure model is valid across different layups and coupon types

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Allowables at your fingertip with Digimat-VA

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A dedicated solution is required to efficiently set up and compute virtual allowablesMaterial definitionTestsConditions(Temperature, humidity)VariabilityVirtual AllowablesFEA analysisLayup definition

Thanks to micro description of the composite,variability can be applied at several levelsMaterial: constituent stiffness and strength propertiesProcess: fiber amount, voidsTesting: fiber orientation

Statistical values of laminate properties become accessible

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Digimat-VA defines test matrix in a few clicks

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Multiscale material models can be created automatically based on composite datasheet

NCAMP datasheetExp data input Constituent properties calibration

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Simulation can reproduce CMH17 recommandations

Material variabilityProcess variabilityExp variability

Ex: 3 material batches definition yields three different fiber strength properties

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.. But it can also go beyond recommanded CMH17 proceduresVariabilityCMH17Digimat-VAMaterial3 batchesMatrix stiffnessMatrix strengthFiber stiffnessFiber strengthProcess2 panelsFiber volume fractionVoid volume fractionFiber alignmentMachining/testing3 samplesNotch sizeSpecimen alignmentMethod & resultsB-basis computationUQ, advanced statistics, true distributionCost18 tests1 year + $$1000s tests< 1 week

approach the true distribution of coupon strength root cause analysis on the distribution queue

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Generation of carpet plot data to explore design spaceNeed to validate prediction with experiment for certificationAutomation of allowables generation can help to explore the design spaceIM7/8552 Unnotched tension carpet plot

Test data IM7/85520% 9020% 9040% 9060% 9080% 9080% 060% 040% 020% 0

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New material systems can be explored virtuallyExisting material system A+BExisting material system C+DNew material system A+DExtractfiber A propertiesExtract matrix D propertiesVirtual Allowables for A+D system

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Allowables at your fingertip with Digimat-VA

Raw stress-strain

B-basis computation

Coupon simulationEmbedded FEA solverDigimat Progressive FailureMicro-level variabilitty

Test matrix definition

Virtual allowablesMean, B-basis, A-basisRoot-cause analysis

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Digimat-VA brings all ingredients for virtual allowables into one productive solution

Productive & efficient user interfaceDigimatmultiscalemodeling + easy calibrationEmbedded non-linear FEA solver

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Prediction of coupon strength is achievable based on limited amount of experimental dataConstituent stiffness & strengthPly stiffness & strength

First release of Digimat-VA sets the first milestone for a solution dedicated to the productive generation of virtual allowablesVA benefits from continuous improvement and integration of Digimat state-of-the-art technology

Stay tuned for official releaseOfficial email to be sent soon

Conclusion

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With Digimat-VA you can:

Reduce cost & time of testingDefine test matrix in a few clicksCreate multi-scale material models based on composite datasheetModel batch and process variabilityGo beyond recommended CMH17 proceduresTurn a test matrix into FEA *Digimat is used by major Material Suppliers, Tier1 and OEMs worldwide.

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Tel: +352 2617 6607 Email: [email protected]/products/solutions/digimat-virtual-allowables

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