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【英文标准名称】:Plastics-Determinationoftemperatureofdeflectionunderload-Plasticsandebonite
【原文标准名称】:塑料.载荷下挠曲温度的测定.塑料、硬橡胶和长纤维增强合成物
【标准号】:BSENISO75-2-2004
【标准状态】:现行
【国别】:英国
【发布日期】:2004-05-28
【实施或试行日期】:2004-05-28
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:试验;试验;温度测量;硬橡胶;温度;测定;弯曲试验;尺寸稳定性;材料试验;热稳定性;试验条件;硫化橡胶;塑料;抗弯应力
【英文主题词】:Bendtesting;Bendingstress;Determination;Dimensionalstability;Ebonite;Materialstesting;Plastics;Temperature;Temperaturemeasurement;Testing;Testingconditions;Thermalstability;Vulcanizedrubber
【摘要】:ThispartofISO75specifiesthreemethods,usingdifferentvaluesofconstantflexuralstress,thatcanbeusedforthedeterminationofthetemperatureofdeflectionunderloadofplastics(includingfilledplasticsandfibrereinforcedplasticsinwhichthefibrelength,priortoprocessing,isupto7,5mm)andebonite:????methodA,usingaflexuralstressof1,80MPa;????methodB,usingaflexuralstressof0,45MPa;????methodC,usingaflexuralstressof8,00MPa.Thestandarddeflection??susedtodeterminethetemperatureofdeflectionunderloadcorrespondstoaflexuralstrainincrease????fdefinedinthispartofISO75.TheinitialflexuralstrainduetotheloadingofthespecimenatroomtemperatureisneitherspecifiednormeasuredinthispartofISO75.Theratioofthisflexural-straindifferencetotheinitialflexuralstraindependsonthemodulusofelasticity,atroomtemperature,ofthematerialundertest.Thismethodisthereforeonlysuitableforcomparingthetemperaturesofdeflectionofmaterialswithsimilarroomtemperatureelasticproperties.NOTEThemethodsgivebetterreproducibilitywithamorphousplasticsthanwithsemi-crystallineones.Withsomematerials,itmaybenecessarytoannealthetestspecimenstoobtainreliableresults.Annealingprocedures,ifused,generallyresultinanincreaseinthetemperatureofdeflectionunderload(see6.6).Foradditionalinformation,seeISO75-1:2004,clause1.
【中国标准分类号】:G31
【国际标准分类号】:83_060;83_080_01
【页数】:22P;A4
【正文语种】:英语