Dynamic Failure of Composite and Sandwich Structures_part11

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1、FoldcoreSandwichStructuresandTheirImpactBehaviour:AnOverviewSebastianHeimbsAbstractThischaptergivesaglobaloverviewonthefamilyoffoldcoresandwichstructureswithaspecialfocusontheirimpactperformance.Foldcorestructuresareproducedbyfoldingaflatsheetofmaterialt

2、othree-dimensionalzigzagstructuresinanorigami-likemanner.Relevantcellwallmaterialsrangefromcardboardtoplastics,frommetalstocomposites.Differentmanufacturingprocessesandfeasiblecellularconfigurationsarepresentedbasedonanextensiveliteratureoverview.Themech

3、anicalpropertiesundercompressionandshearloadsareassessedbasedonstaticanddynamictests.Theimpactperformanceunderlowandhighvelocityimpactwithdifferentprojectilesrangingfromhardbodysteelimpactorstorubberfragmentswithsubsequentdamageassessmentisaddressed.Ina

4、ddition,acomprehensiveoverviewonnumericalmodellingmethodsforfoldcoresandwichanalysesisgiven.Specifictopicslikecellwallmaterialandimperfectionmodellingarediscussed.Numericalfoldcoregeometryoptimisationstudiesandimpactsimulationsarepresentedandtherobustnes

5、sofsuchmodelsandtheirrelevanceforindustrialuseisevaluated.Finally,anoverviewofcurrentandpotentialapplicationsoffoldcoresandwichstructuresisgiven.1IntroductionWeightreductionisoneofthemaindesigndriversofmodernengineeringandtransportstructuresforaerospace

6、andautomotiveapplications.Inthiscontext,thesandwichdesignprincipleisplayingamajorrole,asitallowsformuchhigherweight-specificbendingstiffnesscomparedtoamonolithicstructure.Asandwichstructuretypicallyconsistsoftwothinandstiffskins,separatedbyalightweightS.

7、Heimbs()EADSInnovationWorks,81663Munich,Germanye-mail:Sebastian.Heimbs@eads.netS.Abrateetal.(eds.),DynamicFailureofCompositeandSandwichStructures,491SolidMechanicsandItsApplications192,DOI10.1007/978-94-007-5329-711,©SpringerScienceCBusinessMediaDordre

8、cht2013492S.HeimbsabFig.1Illustrationofhoneycombandfoldcoresandwichstructurescellularcore.Themainpurposeofthecoreistoincreasethebendingstiffnessbyseparatingtheskins,tocarrytransverseshearloadsandtowithstandcompressiveloadsnormalt