ASTM C623-1992(2005) 用共振现象对玻璃和玻璃陶瓷材料的杨氏模量、剪切模量及泊松比的标准试验方法

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【英文标准名称】:StandardTestMethodforYoung'sModulus,ShearModulus,andPoisson'sRatioforGlassandGlass-CeramicsbyResonance
【原文标准名称】:用共振现象对玻璃和玻璃陶瓷材料的杨氏模量、剪切模量及泊松比的标准试验方法
【标准号】:ASTMC623-1992(2005)
【标准状态】:作废
【国别】:
【发布日期】:1992
【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】:C14.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:玻璃;弹性模量;剪切模量;共振;泊松比;陶瓷;试验
【英文主题词】:glass;Poisson'sratio;resonance;shearmodulus;Young'smodulus
【摘要】:Thistestsystemhasadvantagesincertainrespectsovertheuseofstaticloadingsystemsinthemeasurementofglassandglass-ceramics:3.1.1Onlyminutestressesareappliedtothespecimen,thusminimizingthepossibilityoffracture.3.1.2Theperiodoftimeduringwhichstressisappliedandremovedisoftheorderofhundredsofmicroseconds,makingitfeasibletoperformmeasurementsattemperatureswheredelayedelasticandcreepeffectsproceedonamuch-shortenedtimescale,asinthetransformationrangeofglass,forinstance.Thetestissuitablefordetectingwhetheramaterialmeetsspecifications,ifcognizanceisgiventooneimportantfact:glassandglass-ceramicmaterialsaresensitivetothermalhistory.Thereforethethermalhistoryofatestspecimenmustbeknownbeforethemodulicanbeconsideredintermsofspecifiedvalues.Materialspecificationsshouldincludeaspecificthermaltreatmentforalltestspecimens.FIG.1BlockDiagramofApparatus1.1Thistestmethodcoversthedeterminationoftheelasticpropertiesofglassandglass-ceramicmaterials.Specimensofthesematerialspossessspecificmechanicalresonancefrequencieswhicharedefinedbytheelasticmoduli,density,andgeometryofthetestspecimen.Thereforetheelasticpropertiesofamaterialcanbecomputedifthegeometry,density,andmechanicalresonancefrequenciesofasuitabletestspecimenofthatmaterialcanbemeasured.Young'smodulusisdeterminedusingtheresonancefrequencyintheflexuralmodeofvibration.Theshearmodulus,ormodulusofrigidity,isfoundusingtorsionalresonancevibrations.Young'smodulusandshearmodulusareusedtocomputePoisson'sratio,thefactoroflateralcontraction.1.2Allglassandglass-ceramicmaterialsthatareelastic,homogeneous,andisotropicmaybetestedbythistestmethod.Thetestmethodisnotsatisfactoryforspecimensthathavecracksorvoidsthatrepresentinhomogeneitiesinthematerial;neitherisitsatisfactorywhenthesematerialscannotbepreparedinasuitablegeometry.Elasticheremeansthatanapplicationofstresswithintheelasticlimitofthatmaterialmakingupthebodybeingstressedwillcauseaninstantaneousanduniformdeformation,whichwillceaseuponremovalofthestress,withthebodyreturninginstantlytoitsoriginalsizeandshapewithoutanenergyloss.Glassandglass-ceramicmaterialsconformtothisdefinitionwellenoughthatthistestismeaningful.Note1Isotropicmeansthattheelasticpropertiesarethesameinalldirectionsinthematerial.Glassisisotropicandglass-ceramicsareusuallysoonamacroscopicscale,becauseofrandomdistributionandorientationofcrystallites.1.3Acryogeniccabinetandhigh-temperaturefurnacearedescribedformeasuringtheelasticmoduliasafunctionoftemperaturefrom195Cto1200C.1.4Modificationofthetestforuseinqualitycontrolispossible.Arangeofacceptableresonancefrequenciesisdeterminedforapiecewithaparticulargeometryanddensity.Anyspecimenwithafrequencyresponsefallingoutsidethisfrequencyrangeisrejected.Theactualmodulusofeachpieceneednotbedeterminedaslongasthelimitsoftheselectedfrequencyrangeareknowntoincludetheresonancefrequencythatthepiecemustpossessifitsgeometryanddensityarewithinspecifiedtolerances.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q30
【国际标准分类号】:81_040_30;81_060_01
【页数】:7P.;A4
【正文语种】: