statistical tensile strength for high strain rate of aramid and uhmwpe fibers

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1、StatisticalTensileStrengthforHighStrainRateofAramidandUHMWPEFibers46材料工程/2006年5期StatisticalTensileStrengthforHighStrainRateofAramidandUHMWPEFibersYANGBin.XIoNGTao,XIONGJie(KeyLaboratoryofAdvancedTextileMaterialsandManufacturingTechnology,MinistryofEducation,ZhejiangSci—TechUnive

2、rsity,Hangzhou310018,China)Abstract:Dynamictensileimpactpropertiesofaramid(Technora@)andUHMWPE(DC851)fiberbundleswerestudiedattwohighstrainratesbymeansofreflectingtypeSplitHopkinsonBar,andstress—straincurvesoffiberyarnsatdiffer—entstrainrateswereobtained.Experimentalresultsshowt

3、hattheinitialelasticmodulus,failurestrengthandunstablestrainofaramidfiberyarnsarestrainrateinsensitive,whereastheinitialelasticmodulusandunstablestrainofUHM—WPEfibervamsarestrainratesensitive.Afiber-bundlestatisticalconstitutiveequationwasusedtodescribethetensilebehaviorofaramid

4、andUHMWPEfiberbundlesathighstrainrates.ThegoodconsistencybetweenthesimulatedresultsandexDerimenta1dataindicatesthatthemodifieddoubleWeibullfunctioncanrepresentthetensilestrengthdistributionofaramidandUHMWPEfibersandthemethodofextractingWeibullparametersfromfiberbundlesstress—str

5、aindataisval—id.KeywOrds:aramidfiber;UHMWPEfiber;impactbehaviour;statisticalproperties;statisticalconstitutiVeequationCLCnumber:TB33Documentcode:AArticleID:1001-4381(2006)05—0046—05Technora~,madefromaramidfibersandsome—whatsim订artothecommonlyknowKevlar@,andUltrahighlyorientedhig

6、hmolecularweightpolyeth—vlene_UHMWPEfibersarealloftenusedinflexiblearmourapplicationsandhencesubjectedtohighratesofloading.Theutilizationoftheirreinforcedcom—positesarmourincertainballisticapplicationsisin—creasinglypreferredoverconventionalrigidmetalar—moursystemsbecauseofitssu

7、periorstrength..to——weightratioandflexibility.Todate,thedesignanddevelopmentofsuchfabricarmoursystemshavelargelybeenapproachedempirically[卜.Theballis—ticresistanceoffiber—reinforcedcompositeisessen—tiallydependentonthemechanicalbehaviorofthere—inforcingcomponentandthematrix.Fibe

8、rsandfiberbundlescarrythebulkoftheappliedloadin