ASTM C1239-2007 高级陶瓷用报告单轴强度数据和评估维泊尔分布参数的标准实施规程

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【英文标准名称】:StandardPracticeforReportingUniaxialStrengthDataandEstimatingWeibullDistributionParametersforAdvancedCeramics
【原文标准名称】:高级陶瓷用报告单轴强度数据和评估维泊尔分布参数的标准实施规程
【标准号】:ASTMC1239-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:(Practice)
【标准水平】:()
【中文主题词】:陶瓷;额定值;应力
【英文主题词】:advancedceramics;censoreddata;confidencebounds;fractography;fractureorigin;maximumlikelihood;strength;unbiasingfactors;Weibullcharacteristicstrength;Weibullmodulus;Weibullscaleparameter;Weibullstatistics
【摘要】:1.1ThispracticecoverstheevaluationandreportingofuniaxialstrengthdataandtheestimationofWeibullprobabilitydistributionparametersforadvancedceramicsthatfailinabrittlefashion(seeFig.1).TheestimatedWeibulldistributionparametersareusedforstatisticalcomparisonoftherelativequalityoftwoormoretestdatasetsandforthepredictionoftheprobabilityoffailure(or,alternatively,thefracturestrength)forastructureofinterest.Inaddition,thispracticeencouragestheintegrationofmechanicalpropertydataandfractographicanalysis.1.2Thefailurestrengthofadvancedceramicsistreatedasacontinuousrandomvariabledeterminedbytheflawpopulation.Typically,anumberoftestspecimenswithwell-definedgeometryarefailedunderisothermal,well-defineddisplacementand/orforce-applicationconditions.Theforceatwhicheachtestspecimenfailsisrecorded.TheresultingfailurestressdataareusedtoobtainWeibullparameterestimatesassociatedwiththeunderlyingflawpopulationdistribution.1.3Thispracticeisrestrictedtotheassumptionthatthedistributionunderlyingthefailurestrengthsisthetwo-parameterWeibulldistributionwithsizescaling.Furthermore,thispracticeisrestrictedtotestspecimens(tensile,flexural,pressurizedring,etc.)thatareprimarilysubjectedtouniaxialstressstates.Thepracticealsoassumesthattheflawpopulationisstablewithtimeandthatnoslowcrackgrowthisoccurring.1.4ThepracticeoutlinesmethodstocorrectforbiaserrorsintheestimatedWeibullparametersandtocalculateconfidenceboundsonthoseestimatesfromdatasetswhereallfailuresoriginatefromasingleflawpopulation(thatis,asinglefailuremode).Insampleswherefailuresoriginatefrommultipleindependentflawpopulations(forexample,competingfailuremodes),themethodsoutlinedinSection9forbiascorrectionandconfidenceboundsarenotapplicable.1.5Thispracticeincludesthefollowing:1.6ThevaluesstatedinSIunitsaretoberegardedasthestandardperIEEE/ASTMSI10.
【中国标准分类号】:Q32
【国际标准分类号】:81_060_99
【页数】:19P.;A4
【正文语种】: