【英文标准名称】:StandardTestMethodforCoefficientofLinearThermalExpansionofPlasticsBetween-30176Cand30176CWithaVitreousSilicaDilatometer
【原文标准名称】:用玻璃硅膨胀计测定塑料在-30℃和30℃之间的线性热膨胀的标准试验方法
【标准号】:ASTMD696-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D20.30.07
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:coefficientofexpansion;linearexpansion;plastics;thermalexpansion;Coefficientoflinearthermalexpansion;Dilatometermethod;Linearthermalexpansion--plastics;Plastics;Vitreoussilicadilatometer
【摘要】:Thecoefficientoflinearthermalexpansion,x03B1;,betweentemperaturesT1andT2foraspecimenwhoselengthisL0atthereferencetemperature,isgivenbythefollowingequation:whereL1andL2arethespecimenlengthsattemperaturesT1andT2,respectively.x03B1;is,therefore,obtainedbydividingthelinearexpansionperunitlengthbythechangeintemperature.Thenatureofmostplasticsandtheconstructionofthedilatometermakex2212;30to+30x00B0;C(x2212;22x00B0;Fto+54x00B0;F)aconvenienttemperaturerangeforlinearthermalexpansionmeasurementsofplastics.Thisrangecoversthetemperaturesinwhichplasticsaremostcommonlyused.Wheretestingoutsideofthistemperaturerangeorwhenlinearthermalexpansioncharacteristicsofaparticularplasticarenotknownthroughthistemperaturerange,particularattentionshallbepaidtothefactorsmentionedin1.2andspecialpreliminaryinvestigationsbythermo-mechanicalanalysis,suchasthatprescribedinPracticeD4065forthelocationoftransitiontemperatures,mayberequiredtoavoidexcessiveerror.Otherwaysoflocatingphasechangesortransitiontemperaturesusingthedilatometeritselfmaybeemployedtocovertherangeoftemperaturesinquestionbyusingsmallerstepsthan30x00B0;C(54x00B0;F)orbyobservingtherateofexpansionduringasteadyriseintemperatureofthespecimen.Oncesuchatransitionpointhasbeenlocated,aseparatecoefficientofexpansionforatemperaturerangebelowandabovethetransitionpointshallbedetermined.Forspecificationandcomparisonpurposes,therangefromx2212;30x00B0;Cto+30x00B0;C(x2212;22x00B0;Fto+86x00B0;F)(provideditisknownthatnotransitionexistsinthisrange)shallbeused.1.1Thistestmethodcoversdeterminationofthecoefficientoflinearthermalexpansionforplasticmaterialshavingcoefficientsofexpansiongreaterthan1x00D7;10x2212;6/x00B0;Cbyuseofavitreoussilicadilatometer.Atthetesttemperaturesandunderthestressesimposed,theplasticmaterialsshallhaveanegligiblecreeporelasticstrainrateorboth,insofarasthesepropertieswouldsignificantlyaffecttheaccuracyofthemeasurements.Note18212;ThereisnosimilarorequivalentISOstandard.1.1.1TestMethodE228shallbeusedfortemperaturesotherthanx2212;30x00B0;Cto30x00B0;C.1.1.2Thistestmethodshallnotbeusedformeasurementsonmaterialshavingaverylowcoefficientofexpansion(lessthan1x00D7;10x2212;6/x00B0;C).Formaterialshavingverylowcoefficientofexpansion,interferome......
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:5P.;A4
【正文语种】:英语