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【英文标准名称】:Advancedtechnicalceramics-Thermomechanicalpropertiesofmonolithicceramics-Part5:Determinationofelasticmoduliatelevatedtemperatures;EnglishversionofDINEN820-5:2009-10
【原文标准名称】:高级工业陶瓷.单片陶瓷热机械性能.第5部分:高温下弹性模量的测定.英文版本DINEN820-5-2009-10
【标准号】:DINEN820-5-2009
【标准状态】:现行
【国别】:德国
【发布日期】:2009-10
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:高级工业陶瓷;弯曲试验;陶瓷;定义(术语);弯曲模量;高温试验;材料;材料测试;测量;测量技术;机械测试;模数;弹性模量;单片的;整体材料;物理性能;泊松比;特性;基准方法;剪切模量;应变;温度;测试;导热性;热扩散系数;热试验;热力学的
【英文主题词】:Advancedtechnicalceramics;Bendtesting;Ceramics;Definitions;Flexuralmodulus;High-temperaturetesting;Materials;Materialstesting;Measurement;Measuringtechniques;Mechanicaltesting;Modules;Modulusofelasticity;Monolithic;Monolithicmaterials;Physicalproperties;Poisson'sratio;Properties;Referencemethods;Shearmodulus;Strain;Temperature;Testing;Thermalconductivity;Thermaldiffusivity;Thermaltesting;Thermomechanical
【摘要】:ThispartofEN820describesmethodsfordeterminingtheelasticmoduli,specificallyYoung'smodulus,shearmodulusandPoisson'sratio,ofadvancedmonolithictechnicalceramicsattemperaturesaboveroomtemperature.Thestandardprescribesthreealternativemethodsfordeterminingsomeorallofthesethreeparameters:AthedeterminationofYoung'smodulusbystaticflexureofathinbeaminthree-orfour-pointbending.BthedeterminationofYoung'smodulusbyforcedlongitudinalresonance,orYoung'smodulus,shearmodulusandPoisson'sratiobyforcedflexuralandtorsionalresonance,ofathinbeam.CthedeterminationofYoung'smodulusfromthefundamentalnaturalfrequencyofastruckbar(impulseexcitationmethod).ThispartofEN820extendstheabove-definedroom-temperaturemethodsdescribedinEN843-2toelevatedtemperatures.Allthetestmethodsassumetheuseofhomogeneoustestpiecesoflinearelasticmaterials.Thetestassumesthatthetestpiecehasisotropicelasticproperties.Athighporositylevelsallofthemethodscanbecomeinappropriate.Themaximumgrainsize(seeEN623-3),excludingdeliberatelyaddedwhiskers,shouldbelessthan10%oftheminimumdimensionofthetestpiece.NOTE1MethodCinEN843-2basedonultrasonictimeofflightmeasurementhasnotbeenincorporatedintothispartofEN820Althoughthemethodisfeasibletoapply,itisspecialised,andoutsidethecapabilitiesofmostlaboratoriesTherearealsosevererestrictionsontestpiecegeometriesandmethodsofachievingpulsetransmission.ForthesereasonsthismethodhasnotbeenincludedinEN820-5.NOTE2Theuppertemperaturelimitforthistestdependsonthepropertiesofthetestpieces,andcanbelimitedbysofteningwithinthetimescaleofthetest.Inaddition,formethodAtherecanbelimitsdefinedbythechoiceoftestjigconstructionmaterials.NOTE3MethodsBandCmaynotbeappropriateformaterialswithsignificantlevelsofporosity(i.e.>15%)whichcausedampingandaninabilitytodetectresonancesornaturalfrequencies,respectively.NOTE4Thismethoddoesnotprovidefortheeffectsofthermalexpansion,i.e.themeasurementsarebasedonroomtemperaturedimensions.Dependingupontheusetowhichthedataareput.itcanbenecessarytomakeafurthercorrectionbymultiplyingeachdimensionalfactorintherelevantequationsbyafactor(1+α-ΔT)whereαisthemeanlinearexpansioncoefficientoverthetemperatureintervalΔTfromroomtemperature.
【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