【英文标准名称】:StandardTestMethodforTensileStrengthofMonolithicAdvancedCeramicsatAmbientTemperatures
【原文标准名称】:室温下单片高级陶瓷抗拉强度的标准试验方法
【标准号】:ASTMC1273-2005(2010)
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:C28.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:高级陶瓷;百分比弯曲度;抗拉强度;抗拉试验
【英文主题词】:advancedceramic;percentbending;tensilestrength;tensiletesting
【摘要】:Thistestmethodmaybeusedformaterialdevelopment,materialcomparison,qualityassurance,characterization,anddesigndatageneration.Highstrength,monolithicadvancedceramicmaterialsgenerallycharacterizedbysmallgrainsizes(x003C;50x03BC;m)andbulkdensitiesnearthetheoreticaldensityarecandidatesforload-bearingstructuralapplicationsrequiringhighdegreesofwearandcorrosionresistance,andhightemperaturestrength.Althoughflexuraltestmethodsarecommonlyusedtoevaluatestrengthofadvancedceramics,thenon-uniformstressdistributionoftheflexuretestspecimenlimitsthevolumeofmaterialsubjectedtothemaximumappliedstressatfracture.Uniaxially-loadedtensilestrengthtestsprovideinformationonstrength-limitingflawsfromagreatervolumeofuniformlystressedmaterial.Althoughthevolumeorsurfaceareaofmaterialsubjectedtoauniformtensilestressforasingleuniaxially-loadedtensiletestmaybeseveraltimesthatofasingleflexuretestspecimen,theneedtotestastatisticallysignificantnumberoftensiletestspecimensisnotobviated.Therefore,becauseoftheprobabilisticstrengthdistributionsofbrittlematerialssuchasadvancedceramics,asufficientnumberoftestspecimensateachtestingconditionisrequiredforstatisticalanalysisandeventualdesign,withguidelinesforsufficientnumbersprovidedinthistestmethod.Notethatsize-scalingeffectsasdiscussedinPracticeC1239willaffectthestrengthvalues.Therefore,strengthsobtainedusingdifferentrecommendedtensiletestspecimenswithdifferentvolumesorsurfaceareasofmaterialinthegagesectionswillbedifferentduetothesesizedifferences.ResultingstrengthvaluescanbescaledtoaneffectivevolumeorsurfaceareaofunityasdiscussedinPracticeC1239.Tensiletestsprovideinformationonthestrengthanddeformationofmaterialsunderuniaxialtensilestresses.Uniformstressstatesarerequiredtoeffectivelyevaluateanynon-linearstress-strainbehaviorwhichmaydevelopastheresultoftestingmode,testingrate,processingoralloyingeffects,orenvironmentalinfluences.Theseeffectsmaybeconsequencesofstresscorrosionorsubcritical(slow)crackgrowthwhichcanbeminimizedbytestingatappropriatelyrapidratesasoutlinedinthistestmethod.Theresultsoftensiletestsoftestspecimensfabricatedtostandardizeddimensionsfromaparticularmaterialorselectedportions,orboth,ofapartmaynottotallyrepresentthestrengthanddeformationpropertiesoftheentire,full-sizeendproductoritsin-servicebehaviorindifferentenvironments.Forqualitycontrolpurposes,resultsderivedfromstandardizedtensiletestspecimenscanbeconsideredtobeindicativeoftheresponseofthematerialfromwhichtheyweretakenforgivenprimaryprocessingconditionsandpost-processingheattreatments.Thetensilestrengthofaceramicmaterialisdependentonbothitsinherentresistancetofractureandthepresenceofflaws.Analysisoffracturesurfacesandfractography,thoughbeyondthescopeofthistestmethod,ishighlyrecommendedforallpurposes,especiallyfordesigndata.1.1Thistestmethodcoversthedeterminationoftensilestrengthunderuniaxialloadingofmonolithicadvancedceramicsatambienttemperatures.Thistestmethodaddresses,butisnotrestrictedto,varioussuggestedtestspecimengeometriesaslistedintheappendix.Inaddition,testspecimenfabricationmethods,testingmodes(force,displacement,orstraincontrol),testingrates(forcerate,stressrate,displacementrate,ors......
【中国标准分类号】:
【国际标准分类号】:81_060_99
【页数】:18P.;A4
【正文语种】:
基本信息
| 标准名称： | 低噪声行波管冷衰减量的测试方法 |
| 英文名称： | Methods of measurement for cold loss of low noise travelling wave tubes |
| 中标分类： |
综合 >>
标准化管理与一般规定 >>
技术管理 |
| 发布日期： | 1973-02-26 |
| 实施日期： | 1973-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 2页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 综合 标准化管理与一般规定 技术管理