ASTM C848-1988(2006) 用共振法测定卫生陶瓷的杨氏模量、切变模量和泊松比的标准试验方法

作者:标准资料网 时间:2024-05-14 11:44:02  浏览:8720   来源:标准资料网

【英文标准名称】:StandardTestMethodforYoung''sModulus,ShearModulus,andPoisson''sRatioForCeramicWhitewaresbyResonance
【原文标准名称】:用共振法测定卫生陶瓷的杨氏模量、切变模量和泊松比的标准试验方法
【标准号】:ASTMC848-1988(2006)
【标准状态】:现行
【国别】:
【发布日期】:1988
【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】:C21.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:工业瓷器;弹性模量;泊松比;剪切模量;共振;陶瓷;试验
【英文主题词】:cermaicwhitewares;Poisson'sratio;resonance;shearmodulus;Young'smodulus
【摘要】:Thistestsystemhasadvantagesincertainrespectsovertheuseofstaticloadingsystemsinthemeasurementofceramicwhitewares.3.1.1Onlyminutestressesareappliedtothespecimen,thusminimizingthepossibilityoffracture.3.1.2Theperiodoftimeduringwhichstressisappliedandremovedisoftheorderofhundredsofmicroseconds,makingitfeasibletoperformmeasurementsattemperatureswheredelayedelasticandcreepeffectsproceedonamuch-shortenedtimescale.Thistestmethodissuitablefordetectingwhetheramaterialmeetsspecifications,ifcognizanceisgiventooneimportantfact:ceramicwhitewarematerialsaresensitivetothermalhistory.Therefore,thethermalhistoryofatestspecimenmustbeknownbeforethemodulicanbeconsideredintermsofspecifiedvalues.Materialspecificationsshouldincludeaspecificthermaltreatmentforalltestspecimens.1.1Thistestmethodcoversthedeterminationoftheelasticpropertiesofceramicwhitewarematerials.Specimensofthesematerialspossessspecificmechanicalresonancefrequencieswhicharedefinedbytheelasticmoduli,density,andgeometryofthetestspecimen.Thereforetheelasticpropertiesofamaterialcanbecomputedifthegeometry,density,andmechanicalresonancefrequenciesofasuitabletestspecimenofthatmaterialcanbemeasured.Young''smodulusisdeterminedusingtheresonancefrequencyintheflexuralmodeofvibration.Theshearmodulus,ormodulusofrigidity,isfoundusingtorsionalresonancevibrations.Young''smodulusandshearmodulusareusedtocomputePoisson''sratio,thefactoroflateralcontraction.1.2Allceramicwhitewarematerialsthatareelastic,homogeneous,andisotropicmaybetestedbythistestmethod.Thistestmethodisnotsatisfactoryforspecimensthathavecracksorvoidsthatrepresentinhomogeneitiesinthematerial;neitherisitsatisfactorywhenthesematerialscannotbepreparedinasuitablegeometry.Note1Elasticheremeansthatanapplicationofstresswithintheelasticlimitofthatmaterialmakingupthebodybeingstressedwillcauseaninstantaneousanduniformdeformation,whichwillceaseuponremovalofthestress,withthebodyreturninginstantlytoitsoriginalsizeandshapewithoutanenergyloss.Manyceramicwhitewarematerialsconformtothisdefinitionwellenoughthatthistestismeaningful.Note2Isotropicmeansthattheelasticpropertiesarethesameinalldirectionsinthematerial.1.3Acryogeniccabinetandhigh-temperaturefurnacearedescribedformeasuringtheelasticmoduliasafunctionoftemperaturefrom195to1200C.1.4Modificationofthetestforuseinqualitycontrolispossible.Arangeofacceptableresonancefrequenciesisdeterminedforapiecewithaparticulargeometryanddensity.Anyspecimenwithafrequencyresponsefallingoutsidethisfrequencyrangeisrejected.Theactualmodulusofeachpieceneednotbedeterminedaslongasthelimitsoftheselectedfrequencyrangeareknowntoincludetheresonancefrequencythatthepiecemustpossessifitsgeometryanddensityarewithinspecifiedtolerances.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q33
【国际标准分类号】:81_060_20
【页数】:7P.;A4
【正文语种】: