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【英文标准名称】:StandardPracticeforStressRelaxationTestingofRawRubber,UnvulcanizedRubberCompounds,andThermoplasticElastomers
【原文标准名称】:生橡胶、非硫化橡胶混合物和热塑弹性体的应力松弛测试用标准实施规程
【标准号】:ASTMD6048-2007
【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】:D11.12
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:弹性体;橡胶;橡胶混合物;应力;测试
【英文主题词】:compression;elastomer;polymer;relaxation;rubber;shear;strain;stress;viscoelasticity
【摘要】:Theprocessingbehavior(processability)ofrubberorrubberlikematerialsiscloselyrelatedtotheirviscoelasticproperties.Theviscoelasticpropertiesaswellasthemechanicalpropertiesarerelatedtothepolymeric,includingmacromolecularandmicromolecularstructure.Therefore,adeterminationoftheviscoelasticityofamaterialwillprovideinformationtopredictprocessingandserviceperformance.Stressrelaxationtestingprovidesamethodologyforinvestigatingtheviscoelasticityofrubberorrubberlikematerials.Certainstructuralcharacteristicsthathavebeendemonstratedtobeevaluatedbythistestmethodare:(1)averagemolecularweight,(2)molecularweightdistribution,(3)linearityorchainbranching,(4)gelcontent,and(5)monomerratio.Thispracticeisintendedtodescribevariousmethodsofmeasuringthestressrelaxationpropertiesofrawrubber,unvulcanizedrubbercompounds,orthermoplasticelastomersfordeterminingtheprocessabilityofthesematerialsthroughviscoelasticmeasurements.Factoryperformancecharacteristicsthatthismethodologymaycorrelatewithincludedieswellorshrinkage,extrusionrate,millbanding,carbonblackincorporationtime,andmoldflow.1.1Thispracticecoversseveraldifferenttechniquesfordeterminingthestressrelaxationcharacteristicsofrubberandrubberlikematerialsandforthepossibleinterconversionofthisstressrelaxationinformationintodynamicmechanicalproperties.1.2Thetechniquesareintendedformaterialshavingstressrelaxationmoduliintherangeof103to108Pa(0.1to1.5x104psi)andfortesttemperaturesfrom23to225176;C(73to437176;F).Notallmeasuringapparatusmaybeabletoaccommodatetheentireranges.Thesetechniquesarealsointendedformeasurementofmaterialsintheirrubberyormoltenstates,orboth.1.3Differencesinresultswillbefoundamongthetechniques.Becauseofthesedifferences,thetestreportneedstoincludethetechniqueandtheconditionsofthetest.Thisinformationwillallowforresolvinganyissuespertainingtothetestmeasurements.1.4Thegeneralizeddescriptionsofapparatusarebasedonthemeasurementofforceasafunctionoftime.Mathematicaltreatmentofthatrelationshipproducesinformationthatcanberepresentativeofmaterialproperties.Mathematicaltransformationoftheforcemeasurementswillfirstyieldstressrelaxationmoduliwithsubsequenttransformationproducingdynamicmechanicalproperties.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareprovidedforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G30
【国际标准分类号】:83_040_10
【页数】:15P.;A4
【正文语种】: