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【英文标准名称】:StandardTestMethodforDynamicYoung''sModulus,ShearModulus,andPoisson''sRatiobyImpulseExcitationofVibration
【原文标准名称】:用振动脉冲激励法测定先进陶瓷动态杨氏模量,剪切模量和泊松比的试验方法
【标准号】:ASTME1876-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:E28.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:dynamic;elasticmodulus;elasticproperties;impulse;Poisson'sratio;shearmodulus;Young'smodulus;DynamicYoung'smodulus;Impulseexcitationofvibration;Modulusofelasticity;Poisson'sratio;Shearmodulus
【摘要】:Thistestmethodmaybeusedformaterialdevelopment,characterization,designdatageneration,andqualitycontrolpurposes.Thistestmethodisspecificallyappropriatefordeterminingthemodulusofmaterialsthatareelastic,homogeneous,andisotropic(1).Thistestmethodaddressestheroomtemperaturedeterminationofdynamicmoduliofelasticityofslenderbars(rectangularcrosssection)androds(cylindrical).Flatplatesanddisksmayalsobemeasuredsimilarly,buttherequiredequationsfordeterminingthemoduliarenotaddressedherein.Thisdynamictestmethodhasseveraladvantagesanddifferencesfromstaticloadingtechniquesandfromresonanttechniquesrequiringcontinuousexcitation.Thetestmethodisnondestructiveinnatureandcanbeusedforspecimenspreparedforothertests.Thespecimensaresubjectedtominutestrains;hence,themoduliaremeasuredatorneartheoriginofthestress-straincurve,withtheminimumpossibilityoffracture.Theimpulseexcitationtestusesanimpacttoolandsimplesupportsforthetestspecimen.Thereisnorequirementforcomplexsupportsystemsthatrequireelaboratesetuporalignment.Thistechniquecanbeusedtomeasureresonantfrequenciesaloneforthepurposesofqualitycontrolandacceptanceoftestspecimensofbothregularandcomplexshapes.Arangeofacceptableresonantfrequenciesisdeterminedforaspecimenwithaparticulargeometryandmass.Thetechniqueisparticularlysuitablefortestingspecimenswithcomplexgeometries(otherthanparallelepipeds,cylinders/rods,ordisks)thatwouldnotbesuitablefortestingbyotherprocedures.Anyspecimenwithafrequencyresponsefallingoutsidetheprescribedfrequencyrangeisrejected.Theactualmodulusofeachspecimenneednotbedeterminedaslongasthelimitsoftheselectedfrequencyrangeareknowntoincludetheresonantfrequencythatthespecimenmustpossessifitsgeometryandmassarewithinspecifiedtolerances.Ifathermaltreatmentoranenvironmentalexposureaffectstheelasticresponseofthetestspecimen,thistestmethodmaybesuitableforthedeterminationofspecificeffectsofthermalhistory,environmentexposure,andsoforth.Specimendescriptionsshouldincludeanyspecificthermaltreatmentsorenvironmentalexposuresthatthespecimenshavereceived.1.1Thistestmethodcoversdeterminationofthedynamicelasticpropertiesofelasticmaterialsatambienttemperatures.Specimensofthesematerialspossessspecificmechanicalresonantfrequenciesthataredeterminedbytheelasticmodulus,mass,andgeometryofthetestspecimen.Thedynamicelasticpropertiesofamaterialcanthereforebecomputedifthegeometry,mass,andmechanicalresonantfrequenciesofasuitable(rectangularorcylindricalgeometry)testspecimenofthatmaterialcanbemeasured.DynamicYoung''smodulusisdeterminedusingtheresonantfrequencyineithertheflexuralorlongitudinalmodeofvibration.Thedynamicshearmodulus,ormodulusofrigidity,isfoundusingtorsionalresonantvibrations.DynamicYoung''smodulusanddynamicshearmodulusareusedtocomputePoisson''sratio.1.2Althoughnotspecificallydescribedherein,thistestmethodcanalsobeperformedatcryogenicandhightemperatureswithsuitableequipmentmodificationsandappropriatemodificationstothecalculationstocompensateforthermalexpansion.1.3TherearematerialspecificASTMstandardsthatcoverthedeterminationofresonancefrequenciesandelasticpropertiesofspecificmaterialsbysonicresonanceorbyimpulseexcitationofvibration.TestMethodsC215,C623,C747,C848,C1198,andC1259