HG 3-1295-1980 化学试剂 硝酸铋

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标准名称：	水质--二甲基肼的测定对二甲氨基苯甲醛分光光度法
英文名称：	Water quality. Determination of monomethyl hydrazine. p-Dimethylaminobenzaldegyde spectrophotometric method
中标分类：	环境保护 >> 环境保护采样、分析测试方法 >> 工业废水、污染物分析方法
ICS分类：
发布部门：	国家环境保护总局
发布日期：	1993-05-22
实施日期：	1993-01-02
首发日期：	1993-05-22
作废日期：	1900-01-01
主管部门：	国家环境保护总局
提出单位：	国家环境保护总局科技标准司
归口单位：	国家环境保护总局
起草单位：	航空航天部第七设计研究院
起草人：	陈清宇、徐志通、范兆贵、王兰翠
出版社：	中国标准出版社
出版日期：	1993-01-02
页数：	3页

本标准规定了测定水中一甲基肼的对二甲氨基苯甲醛分光光度法。
本标准适用于地面水、航天工业废水中一甲基肼的测定。

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【英文标准名称】:StandardTestMethodforUltimateStrengthofAdvancedCeramicswithDiametrallyCompressedC-RingSpecimensatAmbientTemperature
【原文标准名称】:环境温度下径向压缩C环样品的高级陶瓷的极限强度的标准试验方法
【标准号】:ASTMC1323-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:advancedceramic;C-ringspecimen;uniaxialstrength;Advancedceramics;C-ringspecimens;Monotoniccompressivestrength;Strength--ceramicmaterials/applications;Ultimatestrength
【摘要】:Thistestmethodmaybeusedformaterialdevelopment,materialcomparison,qualityassurance,andcharacterization.Extremecareshouldbeexercisedwhengeneratingdesigndata.ForaC-ringunderdiametralcompression,themaximumtensilestressoccursattheoutersurface.Hence,theC-ringspecimenloadedincompressionwillpredominatelyevaluatethestrengthdistributionandflawpopulation(s)ontheexternalsurfaceofatubularcomponent.Accordingly,theconditionoftheinnersurfacemaybeoflesserconsequenceinspecimenpreparationandtesting.Note18212;AC-ringintensionoranO-ringincompressionmaybeusedtoevaluatetheinternalsurface.Theflexurestressiscomputedbasedonsimplecurved-beamtheory(1,2,3,4,5).Itisassumedthatthematerialisisotropicandhomogeneous,themoduliofelasticityareidenticalincompressionortension,andthematerialislinearlyelastic.Thesehomogeneityandisotropyassumptionsprecludetheuseofthisstandardforcontinuousfiberreinforcedcomposites.Averagegrainsize(s)shouldbenogreaterthanonefiftieth(1/50)oftheC-ringthickness.Thesimplecurved-beamtheorystresssolutionisingoodagreement(typicallybetterthan1%)withatheoryofelasticitysolutionasdiscussedin(3)forthegeometrieschosenforthisstandard.Thesimplebeamtheorystressequationsarerelativelysimple.TheyarerelativelyeasytointegrateforWeibulleffectivevolumeoreffectiveareacomputationsasshowninAppendixX1.Thesimplecurvedbeamandtheoryofelasticitystresssolutionsbotharetwo-dimensionalplanestresssolutions.Theydonotaccountforstressesintheaxial(paralleltob)direction,orvariationsinthecircumferential(hoop,x03C3;x03B8;)stressesthroughthewidth(b)ofthetestpiece.Thevariationsinthecircumferentialstressesincreasewithincreasesinwidth(b)andringthickness(t).Thevariationscanbesubstantial(>10%)fortestspecimenswithlargeb.Thecircumferentialstressespeakattheouteredges.Therefore,thewidth(b)andthickness(t)ofthespecimenspermittedinthistestmethodarelimitedsothataxialstressesarenegligible(seeRef.5)andthevariationsofthecircumferentialstressesfromthenominalsimplecurvedbeamtheorystresscalculationsaretypicallylessthan4%.SeeRef.(3)and(4)formoreinformationonthevariationofthecircumferentialstressesasafunctionofringthickness(t)andringwidth(b).Thetestpieceouterrimcornersarevulnerabletoedgedamage,anotherreasontominimizethedifferencesinthecircumferentialstressesacrosstheringoutersurface.OthergeometryCx2013;ringtestspecimensmaybetested,butcomprehensivefiniteelementanalysesshallbeperformedtoobtainaccuratestressdistributions.Ifstrengthsaretobescaled(converted)tostrengthsofothersizesorgeometries,thenWeibulleffectivevolumesorareasshallbecomputedusingtheresultsofthefiniteelementanalyses.Becauseadvancedceramicsexhibitingbrittlebehaviorgenerallyfracturecatastrophicallyfromasingledominantflawforaparticulartensilestressfield,thesurfaceareaandvolumeofmaterialsubjectedtotensilestressesisasignificantfactorindeterminingtheultimatestrength.Moreover,becauseofthestatisticaldistributionoftheflawpopulation(s)inadvancedceramicsexhibitingbrittlebehavior,asufficientn..........
【中国标准分类号】:Q32
【国际标准分类号】:81_060_99
【页数】:8P.;A4
【正文语种】:英语