Post on 09-Jan-2017
transcript
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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Copyright 2014 e-Xstream engineering
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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Copyright 2014 e-Xstream engineering
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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Copyright 2014 e-Xstream engineering
Multiscale material model used via user subroutine of FEA solverCoupon response is predicted via a coupled finite element analysis
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Copyright 2014 e-Xstream engineering
Prediction of an open hole tension coupon strength is achievable thanks to progressive failure analysis
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Copyright 2014 e-Xstream engineering
A Digimat Progressive Failure model is valid across different layups and coupon types
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Copyright 2014 e-Xstream engineering
Allowables at your fingertip with Digimat-VA
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Copyright 2014 e-Xstream engineering
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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Copyright 2014 e-Xstream engineering
Digimat-VA defines test matrix in a few clicks
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Copyright 2014 e-Xstream engineering
Multiscale material models can be created automatically based on composite datasheet
NCAMP datasheetExp data input Constituent properties calibration
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Copyright 2014 e-Xstream engineering
Simulation can reproduce CMH17 recommandations
Material variabilityProcess variabilityExp variability
Ex: 3 material batches definition yields three different fiber strength properties
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Copyright 2014 e-Xstream engineering
.. 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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Copyright 2014 e-Xstream engineering
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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Copyright 2014 e-Xstream engineering
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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Copyright 2014 e-Xstream engineering
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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Copyright 2014 e-Xstream engineering
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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Copyright 2014 e-Xstream engineering
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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Copyright 2014 e-Xstream engineering
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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Allowablesat your fingerprint
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Tel: +352 2617 6607 Email: info@e-Xstream.comwww.e-Xstream.com/products/solutions/digimat-virtual-allowables
Let us help you get started today!Request your DEMO license!
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