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材料工程  2006 

StatisticalTensileStrengthforHighStrainRateofAramidandUHMWPEFibers

, PP. 46-50

Keywords: aramidfiber,UHMWPEfiber,impactbehaviour,statisticalproperties,statisticalconstitutiveequation

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Abstract:

Dynamictensileimpactpropertiesofaramid(Technora)andUHMWPE(DC851)fiberbundleswerestudiedattwohighstrainratesbymeansofreflectingtypeSplitHopkinsonBar,andstress-straincurvesoffiberyarnsatdifferentstrainrateswereobtained.Experimentalresultsshowthattheinitialelasticmodulus,failurestrengthandunstablestrainofaramidfiberyarnsarestrainrateinsensitive,whereastheinitialelasticmodulusandunstablestrainofUHMWPEfiberyarnsarestrainratesensitive.Afiber-bundlestatisticalconstitutiveequationwasusedtodescribethetensilebehaviorofaramidandUHMWPEfiberbundlesathighstrainrates.ThegoodconsistencybetweenthesimulatedresultsandexperimentaldataindicatesthatthemodifieddoubleWeibullfunctioncanrepresentthetensilestrengthdistributionofaramidandUHMWPEfibersandthemethodofextractingWeibullparametersfromfiberbundlesstress-straindataisvalid.

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