ASTM D4272-2009 用锥体坠落器对塑料薄膜耐总能量冲击的试验方法

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【英文标准名称】:StandardTestMethodforTotalEnergyImpactofPlasticFilmsByDartDrop
【原文标准名称】:用锥体坠落器对塑料薄膜耐总能量冲击的试验方法
【标准号】:ASTMD4272-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D20.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:dartdrop;energytobreak;film;free-fallingdart;impact;instrumentedimpact;totalenergy;Dartimpactmethod;Energyanalysis;Free-fallingdartmethod;Impactresistance--plastics;Impacttesting--plastics;Kineticenergy;Plasticsheetandf
【摘要】:Evaluationoftheimpacttoughnessoffilmisimportantinpredictingtheperformanceofamaterialinapplicationssuchaspackaging,construction,andotheruses.Thetestsimulatestheactionencounteredinapplicationswheremoderate-velocitybluntimpactsoccurinrelativelysmallareasoffilm.Thevaluesobtainedbythistestmethodarehighlydependentonthemethodandconditionsoffilmfabricationaswellasthetypeandgradeofresin.Testmethodsemployingdifferentmissilevelocities,impingingsurfacediameters,oreffectivespecimendiameterswillmostlikelyproducedifferentresults.Dataobtainedbythistestmethodcannotnecessarilybecompareddirectlywiththoseobtainedbyothertestmethods.Theimpactresistanceofafilm,whilepartlydependentonthickness,doesnothaveasimplecorrelationwithsamplethickness.Hence,impactvaluesexpressedinjoules(ftx00B7;lbf)normalizedoverarangeofthicknesswillnotnecessarilybelinearwiththickness.Datafromthistestmethodarecomparableonlyforspecimensthatvarybynomorethanx00B1;15%fromthenominaloraveragethicknessofthespecimenstested.Thetestresultsobtainedbythistestmethodaregreatlyinfluencedbythequalityoffilmundertest.Theinfluenceofvariabilityofdataobtainedbythisprocedurewill,therefore,dependstronglyonthesamplequality,uniformityoffilmthickness,thepresenceofdiemarks,contaminants,etc.Severalimpacttestmethodsareusedforfilm.Itissometimesdesirabletoknowtherelationshipsamongtestresultsderivedbydifferenttestmethods.Astudywasconductedinwhichfourfilmsmadefromtworesins(polypropyleneandlinearlow-densitypolyethylene),withtwofilmthicknessesforeachresin,wereimpactedusingTestMethodsD1709(TestMethodA),TestMethodD3420(ProceduresAandB),andTestMethodD4272.ThetestresultsareshowninAppendixX2.DifferencesinresultsbetweenTestMethodsD1709andD4272areexpectedsinceTestMethodsD1709representsfailure-initiatedenergy,whileTestMethodD4272isinitiationpluscompletionenergy.Somefilmsmayshowconsistencywhentheinitiationenergyisthesameasthetotalenergy.ThisstatementandthetestdataalsoappearinthesignificanceandappendixessectionsofTestMethodsD1709andD3420.1.1Thistestmethoddescribesthedeterminationofthetotalenergyimpactofplasticfilmsbymeasuringthekineticenergylostbyafree-fallingdartthatpassesthroughthefilm.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;Filmhasbeenarbitrarilydefinedassheetinghavingnominalthicknessnotgreaterthan0.25x03BC;m(0.010in.).Note28212;ThistestmethodandISO7765x2013;2addressthesamesubjectmatter,butdifferintechnicalcontent(andresultscannotbedirectlycomparedbetweenthetwotestmethods).TheISOtestmethodcallsforadirectreadoutofenergybyusingaloadcellaspartoftheimpactorhead,whileTestMethodD4272callsforaconstantweightimpactor,thenmeasuringthetimeoftravelthroughagivendistance......
【中国标准分类号】:G33
【国际标准分类号】:83_140_10
【页数】:6P.;A4
【正文语种】:英语