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DIN 19263-2007 pH值测量.pH测量链

作者:标准资料网 时间:2024-05-15 00:25:41  浏览:8567   来源:标准资料网
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【英文标准名称】:pH-measurement-pHmeasuringchains
【原文标准名称】:pH值测量.pH测量链
【标准号】:DIN19263-2007
【标准状态】:现行
【国别】:德国
【发布日期】:2007-05
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:特征;尺寸;电极;玻璃;玻璃电极;工业设施;作标记;材料试验;测量;测量链;测量仪器;计量学;pH值;pH值测定;pH计;特性;参考电极;规范(验收)
【英文主题词】:Characteristics;Dimensions;Electrodes;Glass;Glasselectrodes;Industrialfacilities;Marking;Materialstesting;Measurement;Measuringchains;Measuringinstruments;Metrology;pH;pHmeasurement;pHmeters;Pr
【摘要】:
【中国标准分类号】:G04
【国际标准分类号】:71_040_40
【页数】:8P.;A4
【正文语种】:德语


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【英文标准名称】:StandardTestMethodforFlexuralStrengthofAdvancedCeramicswithEngineeredPorosity(HoneycombCellularChannels)atAmbientTemperatures
【原文标准名称】:环境温度下带工业孔隙(蜂窝状孔道)的高级陶瓷抗挠强度的标准试验方法
【标准号】:ASTMC1674-2008
【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】:C28.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:advancedceramics;catalysts;cellularstructure;filters;flexuralstrength;four-pointflexure;honeycomb;honeycombstructurestrength;nominalbeamstrength;porosity;three-pointflexure;wallfracturestrength
【摘要】:Thistestmethodisusedtodeterminethemechanicalpropertiesinflexureofengineeredceramiccomponentswithmultiplelongitudinalhollowchannels,commonlydescribedasx201C;honeycombx201D;channelarchitectures.Thecomponentsgenerallyhave30%ormoreporosityandthecross-sectionaldimensionsofthehoneycombchannelsareontheorderof1millimeterorgreater.Theexperimentaldataandcalculatedstrengthvaluesfromthistestmethodareusedformaterialandstructuraldevelopment,productcharacterization,designdata,qualitycontrol,andengineering/productionspecifications.Note18212;Flexuretestingisthepreferredmethodfordeterminingthenominalx201C;tensilefracturex201D;strengthofthesecomponents,ascomparedtoacompression(crushing)test.Anominaltensilestrengthisrequired,becausethesematerialscommonlyfailintensionunderthermalgradientstresses.Atruetensiletestisdifficulttoperformonthesehoneycombspecimensbecauseofgrippingandalignmentchallenges.Themechanicalpropertiesdeterminedbythistestmethodarebothmaterialandarchitecturedependent,becausethemechanicalresponseandstrengthoftheporoustestspecimensaredeterminedbyacombinationofinherentmaterialpropertiesandmicrostructureandthearchitectureofthechannelporosity[porosityfraction/relativedensity,channelgeometry(shape,dimensions,cellwallthickness,etc.),anisotropyanduniformity,etc.]inthespecimen.Comparisonoftestdatamustconsiderbothdifferencesinmaterial/compositionpropertiesaswellasdifferencesinchannelporosityarchitecturebetweenindividualspecimensanddifferencesbetweenandwithinspecimenlots.TestMethodAisauser-definedspecimengeometrywithachoiceoffour-pointorthree-pointflexuretestinggeometries.Itisnotpossibletodefineasinglefixedspecimengeometryforflexuretestingofhoneycombs,becauseofthewiderangeofhoneycombarchitecturesandcellsizesandconsiderationsofspecimensize,cellshapes,pitch,porositysize,crushstrength,andshearstrength.Asageneralrule,theexperimenterwillhavetodefineasuitabletestspecimengeometryfortheparticularhoneycombstructureofinterest,consideringcomposition,architecture,cellsize,mechanicalproperties,andspecimenlimitationsandusingthefollowingguidelines.Detailsonspecimengeometrydefinitionaregiveninsection9.2.Four-pointflexure(TestMethodA1)isstronglypreferredandrecommendedfortestingandcharacterizationpurposes.(FromTestMethodC1161section4.5:x201C;Thethree-pointtestconfigurationexposesonlyaverysmallportionofthespecimentothemaximumstress.Therefore,three-pointflexuralstrengthsarelikelytobemuchgreaterthanfour-pointflexuralstrengths.Three-pointflexurehassomeadvantages.Itusessimplertestfixtures,itiseasiertoadapttohightemperatureandfracturetoughnesstesting,anditissometimeshelpfulinWeibullstatisticalstudies.However,four-pointflexureispreferredandrecommendedformostcharacterizationpurposes.x201D;)Thethree-pointflexuretestconfiguration(TestMethodA2)maybeusedforspecimenswhicharenotsuitablefor4-pointtesting,withtheclearunderstandingthat3-pointloadingexposesonlyaverysmallportionofthespecimentothemaximumstress,ascomparedtothemuchlargermaximumstressvolumeina4-pointloadingconfiguration.Therefore,3-pointflexuralstrengthsarelikelytobegreaterthan4-pointflexuralstrengths,basedonstatisticalflawdistributionfactors.TestMethodB(withaspecifiedspecimen......
基本信息
标准名称:农田排水用塑料单壁波纹管
英文名称:Single wall corrugated plastics pipes for agricultural drainage
中标分类: 化工 >> 合成材料 >> 塑料型材
ICS分类: 流体系统和通用件 >> 管道部件和管道 >> 塑料管
发布部门:中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会
发布日期:2005-03-23
实施日期:2005-09-01
首发日期:2005-03-23
作废日期:1900-01-01
主管部门:水利部
提出单位:中华人民共和国水利部
归口单位:中华人民共和国水利部
起草单位:中国水利水电科学研究院、上海市水利排灌管理处、上海兴华塑料建材厂
起草人:余玲、高占义、刘晓涛、桑保良、秦德刚、丁昆仑、王培兴、陈明熙、吴伟峰
出版社:中国标准出版社
出版日期:2005-09-01
页数:平装16开, 页数:7, 字数:10000
书号:155066.1-22569
适用范围

本标准规定了农田排水用塑料单壁波纹管的产品规格、材料、技术要求、试验方法、检验规则、标志、运输和贮存。本标准适用于经挤出、吹塑、成波、定型打孔或不打孔而成的单壁波纹管。

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所属分类: 化工 合成材料 塑料型材 流体系统和通用件 管道部件和管道 塑料管

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