基本信息
| 标准名称： | 鱿鱼干 |
| 英文名称： | Dried squids |
| 中标分类： |
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食品加工与制品 >>
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| 替代情况： | 原标准号GB 8585-1988;被SC/T 3208-2001代替 |
| 发布日期： | 1987-08-20 |
| 实施日期： | 1988-10-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 3页 |
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所属分类： 食品 食品加工与制品 水产品加工与制品
【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(2010)
【标准状态】:现行
【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;泊松比;共振;剪切模量;杨氏模量
【英文主题词】:glass;Poisson'sratio;resonance;shearmodulus;Young'smodulus
【摘要】:Thistestsystemhasadvantagesincertainrespectsovertheuseofstaticloadingsystemsinthemeasurementofglassandglass-ceramics:Onlyminutestressesareappliedtothespecimen,thusminimizingthepossibilityoffracture.Theperiodoftimeduringwhichstressisappliedandremovedisoftheorderofhundredsofmicroseconds,makingitfeasibletoperformmeasurementsattemperatureswheredelayedelasticandcreepeffectsproceedonamuch-shortenedtimescale,asinthetransformationrangeofglass,forinstance.Thetestissuitablefordetectingwhetheramaterialmeetsspecifications,ifcognizanceisgiventooneimportantfact:glassandglass-ceramicmaterialsaresensitivetothermalhistory.Thereforethethermalhistoryofatestspecimenmustbeknownbeforethemodulicanbeconsideredintermsofspecifiedvalues.Materialspecificationsshouldincludeaspecificthermaltreatmentforalltestspecimens.1.1Thistestmethodcoversthedeterminationoftheelasticpropertiesofglassandglass-ceramicmaterials.Specimensofthesematerialspossessspecificmechanicalresonancefrequencieswhicharedefinedbytheelasticmoduli,density,andgeometryofthetestspecimen.Thereforetheelasticpropertiesofamaterialcanbecomputedifthegeometry,density,andmechanicalresonancefrequenciesofasuitabletestspecimenofthatmaterialcanbemeasured.Young''smodulusisdeterminedusingtheresonancefrequencyintheflexuralmodeofvibration.Theshearmodulus,ormodulusofrigidity,isfoundusingtorsionalresonancevibrations.Young''smodulusandshearmodulusareusedtocomputePoisson''sratio,thefactoroflateralcontraction.1.2Allglassandglass-ceramicmaterialsthatareelastic,homogeneous,andisotropicmaybetestedbythistestmethod.Thetestmethodisnotsatisfactoryforspecimensthathavecracksorvoidsthatrepresentinhomogeneitiesinthematerial;neitherisitsatisfactorywhenthesematerialscannotbepreparedinasuitablegeometry.Note18212;Elasticheremeansthatanapplicationofstresswithintheelasticlimitofthatmaterialmakingupthebodybeingstressedwillcauseaninstantaneousanduniformdeformation,whichwillceaseuponremovalofthestress,withthebodyreturninginstantlytoitsoriginalsizeandshapewithoutanenergyloss.Glassandglass-ceramicmaterialsconformtothisdefinitionwellenoughthatthistestismeaningful.Note28212;Isotropicmeansthattheelasticpropertiesarethesameinalldirectionsinthematerial.Glassisisotropicandglass-ceramicsareusuallysoonamacroscopicscale,becauseofrandomdistributionandorientationofcrystallites.1.3Acryogeniccabinetandhigh-temperaturefurnacearedescribedformeasuringtheelasticmoduliasafunctionoftemperaturefromx2212;195x00B0;Cto1200x00B0;C.1.4Modificationofthetestforuseinqualitycontrolispossible.Arangeofacceptableresonancefrequenciesisdeterminedforapiecewithaparticulargeometryanddensity.Anyspecimenwithafrequencyresponsefallingoutsidethisfrequencyrangeisrejected.Theactualmodulusofeachpieceneednotbedeterminedaslongasthelimitsoftheselectedfrequencyrangeareknowntoincludetheresonancefrequencythatthepiecemustpossessifitsgeometryanddensityarewithinspecifiedtolerances.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddress......
【中国标准分类号】:
【国际标准分类号】:81_040_30;81_060_01
【页数】:7P.;A4
【正文语种】: