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【英文标准名称】:StandardTestMethodforPlastics:DynamicMechanicalProperties:InFlexure(Three-PointBending)
【原文标准名称】:塑料的标准试验方法:动态机械性能:弯曲(三点弯曲)
【标准号】:ASTMD5023-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:D20.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:流动能力;弯曲测试;塑料;测试;热固性聚合物
【英文主题词】:dynamicmechanicalrheologicalproperties;elastic;flexuralviscoelasticbehavior;lineardisplacement;loss;storagemodulus;tandelta
【摘要】:Thistestmethodprovidesasimplemeansofcharacterizingthethermomechanicalbehaviorofplasticcompositionsusingverysmallamountsofmaterial.Thedataobtainedmaybeusedforqualitycontrol,researchanddevelopmentaswellastheestablishmentofoptimumprocessingconditions.Dynamicmechanicaltestingprovidesasensitivemeansfordeterminingthermomechanicalcharacteristicsbymeasuringtheelasticandlossmoduliasafunctionoffrequency,temperature,ortime.Plotsofmoduliandtandeltaofamaterialversusthesevariablescanbeusedtoprovideagraphicalrepresentationindicativeoffunctionalproperties,effectivenessofcure(thermosettingresinsystem),anddampingbehaviorunderspecifiedconditions.Thistestmethodcanbeusedtoassess:5.3.1Modulusasafunctionoftemperature,5.3.2Modulusasafunctionoffrequency,5.3.3Theeffectsofprocessingtreatment,5.3.4Relativeresinbehavioralproperties,includingcureanddamping.5.3.5Theeffectsofsubstratetypesandorientation(fabrication)onmodulus,and5.3.6Theeffectsofformulationadditiveswhichmightaffectprocessabilityorperformance.Beforeproceedingwiththistestmethod,refertothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameters,orcombinationthereof,coveredintherelevantASTMmaterialsspecificationshalltakeprecedenceoverthosementionedinthistestmethod.IftherearenorelevantASTMmaterialspecifications,thenthedefaultconditionsapply.1.1Thistestmethodoutlinestheuseofdynamicmechanicalinstrumentationfordeterminingandreportingthevisco-elasticpropertiesofthermoplasticandthermosettingresinsandcompositesystemsintheformofrectangularbarsmoldeddirectlyorcutfromsheets,plates,ormoldedshapes.Thedatagenerated,usingthree-pointbendingtechniques,maybeusedtoidentifythethermomechanicalpropertiesofaplasticmaterialorcompositionsusingavarietyofdynamicmechanicalinstruments.1.2Thistestmethodisintendedtoprovidemeansfordeterminingtheviscoelasticpropertiesofawidevarietyofplasticsmaterialsusingnonresonant,forced-vibrationtechniquesinaccordancewithPracticeD4065.Plotsoftheelastic(storage)modulus;loss(viscous)modulus;complexmodulusandtandeltaasafunctionoffrequency,time,ortemperatureareindicativeofsignificanttransitionsinthethermomechanicalperformanceofpolymericmaterialsystems.1.3Thistestmethodisvalidforawiderangeoffrequencies,typicallyfrom0.01to100Hz.1.4Apparentdiscrepanciesmayariseinresultsobtainedunderdifferingexperimentalconditions.Theseapparentdifferencesfromresultsobservedinanotherstudycanusuallybereconciled,withoutchangingtheobserveddata,byreportinginfull(asdescribedinthistestmethod)theconditionsunderwhichthedatawereobtained.1.5Duetopossibleinstrumentationcompliance,thedatageneratedareintendedtoindicaterelativeandnotnecessarilyabsolutepropertyvalues.1.6Testdataobtainedbythistestmethodarerelevantandappropriateforuseinengineeringdesign.1.7ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note1ThistestmethodisequivalenttoISO6721,Part5.
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:4P.;A4
【正文语种】: