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1、DiscreteModelingoftheCrushingofNomexHoneycombCoreandApplicationtoImpactandPost-impactBehaviorofSandwichStructuresBrunoCastanie,YulfianAminanda,Jean-JacquesBarrau,´andPascalThevenetAbstractInthischapter,anoriginalmethodformodelingthebehaviorofsandwichstructuresduringandafterimpa
2、ctisproposedandvalidated.ItisbasedonthedemonstrationthatNomexhoneycombbehavesinapost-bucklingmodeveryearlyandthatcompressionforcesaretakenupbythecornersorverticaledgesofthehoneycombcellsinthesamewayastheyareinthestiffenersinaircraftstructures.Thusitispossibletorepresentthehone
3、ycombdiscretelybyagridofspringslocatedatthesixcornersofhexagonalcells.Thisapproachrepresentsthephenomenonofindentationonhoneycombaloneoronsandwichesverywell.Thisapproachprovidesanunderstandingofhowthesandwichandthecorebehaveundercompressionafterimpact.Anoriginalcriterionbasedo
4、nalocalcorecrushistestedandvalidatedtocomputetheresidualstrength.Toconsiderthebendingresponseofsandwichstructures,amulti-levelapproachisalsoproposed.KeywordsImpactSandwichCompressionafterimpact1IntroductionInthisfirstsection,thegeneralcontextofthestudywillbepresentedfirst,follow
5、edbyabriefliteraturesurvey.Finally,thescopeofthestudywillbeexplained.B.Castanie(´)J.-J.BarrauINSA,ISAE,Mines-Albi,UPS;ICA(InstitutClementAder),Universit´edeToulouse,´135AvenuedeRangueil,31077Toulouse,Francee-mail:bruno.castanie@insa-toulouse.frY.AminandaMechanicalEngineeringD
6、epartment,IIUM,Jl.Gombak,P.O.Box10,50728KualaLumpur,MalaysiaP.ThevenetEADSInnovationWorks,12ruePasteur,BP76,92152SuresnesCedex,FranceS.Abrateetal.(eds.),DynamicFailureofCompositeandSandwichStructures,427SolidMechanicsandItsApplications192,DOI10.1007/978-94-007-5329-710,©Spring
7、erScienceCBusinessMediaDordrecht2013428B.Castanieetal.´1.1BackgroundSandwichstructuresconsistoftwoskins,havinghighmechanicalproperties,andalightweightcore,whichseparatestheskins.Thequalityoftheskins-coreassemblyisintrinsicallylinkedtothemechanicalcharacteristicsofthecore.Whent
8、hethicknessofthecoreisincreased,thebendingstiffnessandcritica
