aworldofflexiblecomposites：一种柔性复合材料的世界

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1、PRESSINFORMATIONREF:ASPR143FinalDateIssued:31.10.08Wordcount1201ProducedforMaterialsWorldTheadoptionofflexiblecompositesindefenceandaerospaceapplicationsAreportpreparedbyAeroSekurforMaterialsWorldWhenmostpeoplehearthewordcompositetheythinkofeitherlowcostresin

2、basedsystemslikeGRPorhigh-techmaterialssuchasMetalMatrixCompositesMMC’s.However,thereisagroupofmaterialsknownasFlexibleCompositeMaterialswhichtendtobeusedinsheetformandoffertrueflexibilityforawidevarietyofapplications.InthisarticleAeroSekur,manufacturerofsafe

3、tysystemsandadvancedflexiblestructuresfortheaerospaceanddefencemarkets,describestwoofthecompositeflexiblematerialdevelopmentstheyhaveadoptedindesigninnovationsoverthelastfortyyears.Spaceapplications-aflexiblelowweightheatshieldThefirstcasestudyfeaturedinthisr

4、eportwaspromptedbythefailureoftheceramicheatshieldontheColumbiaSpaceShuttlein2003.Asaresultofthispivotalmomentinspacehistory,engineersatAeroSekurconsideredthepotentialtoconstructaflexiblelightweightstructurewhichwouldresistthehightemperaturesgeneratedduringat

5、mosphericre-entrybuthavealowlaunchvolume/lowmass.Continued…………2FlexibleCompositesareusedtoprotecttheSPacecrewEmergencyModule(SPEM)againsthightemperaturesduringatmosphericre-entryThefourkeychallengesidentifiedbyAeroSekurwereto:-1)Identifyaflexiblecoatingthatwo

6、uldresisttemperaturesofupto1400ºC2)Providesufficientinsulationtokeepthepayloadtemperatureto<40ºCduringre-entry3)Developasupportingstructurewhichwouldbelowvolumewhenpacked,butprovidesufficientstructuralrigiditytosupportthethermalprotectionlayersunderre-entrylo

7、adconditionswhendeployed4)KeepthetotalsystemweighttoaminimumThesolutionThesolutiondevelopedconsistsofacompressednitrogengassystemwhich,whenactivated,inflatesamulti-sectionedbladder,comprisingbothgasimpermeableandstructuralelementsbasedonNylonandKevlarmaterial

8、s.Continued…………3SPEMgasinflationsystemOntopofthisstructurealightweightthermalbarrierwasrequired.Afterreviewinganumberofmaterialsaluminawaschosenduetoitslowthermalconductivityandlowweight.