ASTM D6793-2002(2007) 测定等温正割和正切体积弹性模量的标准试验方法

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【英文标准名称】:StandardTestMethodforDeterminationofIsothermalSecantandTangentBulkModulus
【原文标准名称】:测定等温正割和正切体积弹性模量的标准试验方法
【标准号】:ASTMD6793-2002(2007)
【标准状态】:现行
【国别】:
【发布日期】:2002
【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】:D02.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:density;dynamicbulkmodulus;isentropicbulkmodulus;isothermalbulkmodulus;isothermalsecantbulkmodulus;isothermaltangentbulkmodulus;pressure;staticbulkmodulus
【摘要】:Isothermalsecantbulkmodulus(staticbulkmodulus)isapropertythatmeasuresthecompressibilityofaliquid.Thegreaterthevalue,thelessthecompressibilityoftheliquid.Isothermalsecantbulkmodulusisemployedinthedesignofhighperformancehydraulicfluidandbrakingsystems.Highbulkmodulusisdesirableinthattheresponsetimeofasystemisfasterwhenappliedpressuremoredirectlyeffectstheactionofthesystemratherthaninthecompressionoftheworkingliquid.Ifisothermalsecantbulkmodulusisknownasafunctionofpressure,thedatamaybeusedtocalculateisothermaltangentbulkmodulusanddensityasafunctionofpressure.Thedatamaynot,however,beusedtodetermineisentropic(dynamic)bulkmodulus.ThatpropertyisusuallydeterminedfromvelocityofsoundmeasurementsanddiffersfromisothermalbulkmodulusbytheratioofCp/Cv=x03B3;(theratioofheatcapacityatconstantpressuretothatatconstantvolumeforthetestspecimen.1.1Thistestmethodcoversthedeterminationofisothermalsecantandtangentbulkmodulusofliquidswhicharestableandcompatiblewithstainlesssteelundertheconditionsoftest.1.2Thistestmethodisdesignedtobeusedoverthetemperaturerangefrom-40to200176;Candfromambientto68.95Mpa(10000psig).Note1Becauseofthedesignofthetestapparatus,theupperlimitofpressurewhichcanbeattainedislimitedbythebulkmodulusofthetestfluid.Pressuresashighas68.95Mpawillnotbeattainedforfluidsofrelativelylowbulkmodulusatthetesttemperature.1.3Thistestmethodassumesthattheuserisproficientintheassemblyanduseofmediumpressure(m/p)threadedandconedfittingswhichareintendedforuseatpressuresupto137.9Mpa(20000psig).Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note2Becausehydraulicpressureinthetestsystemisproducedbypurelymechanicalmeans,thetestmethodisnotsubjecttothehazardsassociatedwithsystemswhicharepressurizedpneumatically.Evensmallleakswillresultinimmediatedropinpressuretoambientwithoutproductionofahighpressureliquidstreamormist.
【中国标准分类号】:A42
【国际标准分类号】:75_160_20
【页数】:5P.;A4
【正文语种】: