Dynamic Failure of Composite and Sandwich Structures_part2

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1、BlastLoadingofSandwichStructuresandCompositeTubesH.Arora,P.A.Hooper,andJ.P.DearAbstractThischapterreviewsblastimpactexperimentationonglassfibrerein-forcedpolymer(GFRP)andcarbon-fibrereinforcedpolymer(CFRP)sandwichcompositematerialsandlaminatecompositetubes.Explosivecha

2、rgesof0.64–100kgTNTequivalentwereusedduringtheseair-andunderwater-blasttests.Thedifferenceinresponseanddamageinflictedfromunderwater-andair-blastloadingwasassessedfromstrain-fieldmeasurementsandpost-blastspecimenanalysis.Proceduresformonitoringthestructuralresponseofsu

3、chmaterialsduringblasteventshavebeendevised.High-speedphotographywasemployedduringtheair-blastloadingofGFRPandCFRPsandwichpanels,inconjunctionwithdigitalimagecorrelation(DIC),tomonitorthedeformationofthesestructuresundershockloading.Failuremechanismshavebeenrevealedu

4、singDICandconfirmedinpost-testsectioning.TheimprovedperformanceofcompositesandwichstructureswithCFRPskinscomparedtoGFRPequivalentconstructionsisdemonstratedforair-blastexperiments.StraingaugeswereusedtomonitorthestructuralresponseofsimilarsandwichmaterialsandGFRPtubul

5、arlaminatesduringunderwatershocks.Theeffectofthesupporting/backingmedium(airorwater)ofthetargetfacingtheshockhasbeenidentifiedduringthesestudies.Mechanismsoffailurehavebeenestablishedsuchascorecrushing,skin/corecracking,delaminationandfibrebreakage.Straingaugedatasuppo

6、rtedthemechanismsforsuchdamage.Atransitioninbehaviourwasobservedinthesandwichpanelswhensubjecttoanunderwaterblastasopposedtoanair-blastload.Damagemechanismsnotablyshiftedfromdistributedcoreshearfailureoriginatingfromregionsofhighshearinairblasttoglobalcorecrushinginu

7、nderwaterblast.Thefull-scaleexperimentalresultspresentedherewillassistinthedevelopmentofanalyticalandcomputationalmodels.Furthermore,theresearchhighlightstheimportanceofboundaryconditionswithregardstoblastresistantdesign.H.Arora•P.A.Hooper•J.P.Dear()DepartmentofMech

8、anicalEngineering,ImperialCollege,LondonSW72AZ,UKe-mail:hari.arora04@imperial.ac.uk;p.hooper07@imperial.ac.uk;j.dear@imperial.ac.uk