MIL-G-45653 (AMENDMENT 2)
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MIL-G-45653 (AMENDMENT 2), MILITARY SPECIFICATION, GAGE, CYLINDRICAL PLUG AND RING, PLAIN (8 JUN 1983).
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基本信息
| 标准名称： | 特殊阀门维护检修规程 |
| 中标分类： | 化工 >> 化工机械与设备 >> 化工设备 |
| 替代情况： | 被SHS 02019-2004代替 |
| 发布日期： | |
| 实施日期： | 1992-11-09 |
| 首发日期： | |
| 作废日期： | 2004-06-21 |
| 出版日期： | |
| 页数： | 44页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 化工 化工机械与设备 化工设备
【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】: