ASTM C1366-2004(2009) 高温下单值高级陶瓷抗拉强度的标准试验方法

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【英文标准名称】:StandardTestMethodforTensileStrengthofMonolithicAdvancedCeramicsatElevatedTemperatures
【原文标准名称】:高温下单值高级陶瓷抗拉强度的标准试验方法
【标准号】:ASTMC1366-2004(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【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】:
【英文主题词】:advancedceramic;elevatedtemperatures;percentbending;tensilestrength;tensiletesting;Advancedceramics;Elevatedtemperaturetests;Monolithicadvancedceramics;Tensileproperties/testing--ceramics
【摘要】:Thistestmethodmaybeusedformaterialdevelopment,materialcomparison,qualityassurance,characterization,reliabilityassessment,anddesigndatageneration.Highstrength,monolithicadvancedceramicmaterialsaregenerallycharacterizedbysmallgrainsizes(x003C;50x03BC;m)andbulkdensitiesnearthetheoreticaldensity.Thesematerialsarecandidatesforload-bearingstructuralapplicationsrequiringhighdegreesofwearandcorrosionresistanceandelevated-temperaturestrength.Althoughflexuraltestmethodsarecommonlyusedtoevaluatestrengthofadvancedceramics,thenonuniformstressdistributionoftheflexurespecimenlimitsthevolumeofmaterialsubjectedtothemaximumappliedstressatfracture.Uniaxially-loadedtensilestrengthtestsprovideinformationonstrength-limitingflawsfromagreatervolumeofuniformlystressedmaterial.Becauseoftheprobabilisticstrengthdistributionsofbrittlematerialssuchasadvancedceramics,asufficientnumberoftestspecimensateachtestingconditionisrequiredforstatisticalanalysisandeventualdesignwithguidelinesforsufficientnumbersprovidedinthistestmethod.Size-scalingeffectsasdiscussedinpracticeC1239willaffectthestrengthvalues.Therefore,strengthsobtainedusingdifferentrecommendedtensiletestspecimengeometrieswithdifferentvolumesorsurfaceareasofmaterialinthegagesectionswillbedifferentduetothesesizedifferences.Resultingstrengthvaluescan,inprinciple,bescaledtoaneffectivevolumeoreffectivesurfaceareaofunityasdiscussedinPracticeC1239.Tensiletestsprovideinformationonthestrengthanddeformationofmaterialsunderuniaxialstresses.Uniformstressstatesarerequiredtoeffectivelyevaluateanynon-linearstress-strainbehaviorwhichmaydevelopastheresultoftestingmode,testingrate,processingoralloyingeffects,environmentalinfluences,orelevatedtemperatures.Theseeffectsmaybeconsequencesofstresscorrosionorsubcritical(slow)crackgrowthwhichcanbeminimizedbytestingatappropriatelyrapidratesasoutlinedinthistestmethod.Theresultsoftensiletestsofspecimensfabricatedtostandardizeddimensionsfromaparticularmaterialorselectedportionsofapart,orboth,maynottotallyrepresentthestrengthanddeformationpropertiesoftheentire,full-sizeendproductoritsin-servicebehaviorindifferentenvironments.Forqualitycontrolpurposes,resultsderivedfromstandardizedtensiletestspecimenscanbeconsideredtobeindicativeoftheresponseofthematerialfromwhichtheyweretakenforparticularprimaryprocessingconditionsandpost-processingheattreatments.Thetensilestrengthofaceramicmaterialisdependentonbothitsinherentresistancetofractureandthepresenceofflaws.AnalysisoffracturesurfacesandfractographyasdescribedinPracticeC1322andMIL-HDBK-790,thoughbeyondthescopeofthistestmethod,arerecommendedforallpurposes,especiallyfordesigndata.1.1Thistestmethodcoversthedeterminationoftensilestrengthunderuniaxialloadingofmonolithicadvancedceramicsatelevatedtemperatures.Thistestmethodaddresses,butisnotrestrictedto,varioussuggestedtestspecimengeometriesaslistedintheappendix.Inaddition,testspecimenfabricationmethods,testingmodes(force,displacement,orstraincontrol),testingrates(forcerate,stressrate,displacementrate,orstrainrate),allowablebending,anddatacollectionandreportingproceduresareaddressed.Tensilestrengthasusedinthistestmethodreferstothetensilestrengthobtainedunderuniaxialloading.1.2Thistestmethodappliesprimarilytoadvancedceramicswhichmacroscopicallyexhibiti......
【中国标准分类号】:Q32
【国际标准分类号】:81_060_30
【页数】:27P.;A4
【正文语种】:英语