标准名称：	封闭轨积放式悬挂输送机 产品质量分等
替代情况：	JB/ZQ8034-89
发布部门：	北京起重所
发布日期：	1900-01-01
实施日期：	1900-01-01
首发日期：	1900-01-01
作废日期：	1900-01-01
出版日期：	1900-01-01

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【英文标准名称】:StandardTestMethodforThermalDiffusivitybytheFlashMethod
【原文标准名称】:用闪光法测定热扩散率的标准试验方法
【标准号】:ASTME1461-2007
【标准状态】:现行
【国别】:美国
【发布日期】:2007
【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】:E37.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:flashmethod;infrareddetectors;intrinsicthermocouples;specificheatcapacity;thermalconductivity;thermaldiffusivity;transienttemperaturemeasurements;Carbon;Flash/noflashmethod;Graphite;Infrared(IR)analysis;Intrinsicthermocouple
【摘要】:Thermaldiffusivityisanimportantproperty,requiredforsuchpurposesundertransientheatflowconditions,suchasdesignapplications,determinationofsafeoperatingtemperature,processcontrol,andqualityassurance.Theflashmethodisusedtomeasurevaluesofthermaldiffusivity,x03B1;,ofawiderangeofsolidmaterials.Itisparticularlyadvantageousbecauseofsimplespecimengeometry,smallspecimensizerequirements,rapidityofmeasurementandeaseofhandling..Undercertainstrictconditions,specificheatcapacityofahomogeneousisotropicopaquesolidsamplecanbedeterminedwhenthemethodisusedinaquantitativefashion(seeAppendixX2).Thermaldiffusivityresults,togetherwithrelatedvaluesofspecificheatcapacity(Cp)anddensity(x03C1;)values,canbeusedinmanycasestoderivethermalconductivity(x03BB;),accordingtotherelationship:1.1Thistestmethodcoversthedeterminationofthethermaldiffusivityofprimarilyhomogeneousisotropicsolidmaterials.Thermaldiffusivityvaluesrangingfrom10-7to10-3m2/saremeasurablebythistestmethodfromabout75to2800K.1.2ThistestmethodisamoredetailedformofTestMethodC714,havingapplicabilitytomuchwiderrangesofmaterials,applications,andtemperatures,withimprovedaccuracyofmeasurements.1.3Thistestmethodisintendedtoallowawidevarietyofapparatusdesigns.Itisnotpracticalinatestmethodofthistypetoestablishdetailsofconstructionandprocedurestocoverallcontingenciesthatmightofferdifficultiestoapersonwithoutpertinenttechnicalknowledge,ortostoporrestrictresearchanddevelopmentforimprovementsinthebasictechnique.1.4Thistestmethodisapplicabletothemeasurementsperformedonessentiallyfullydense(preferably,butlowporositywouldbeacceptable),homogeneeous,andisotropicsolidmaterialsthatareopaquetothespecimenofappliedenergypulse.Experiencehasshown,however,thatsomedeviationfromthesestrictguidelinescanbeaccommodatedwithcareandproperexperimentaldesign,substantiallybroadeningtheusefulnessofthemethod.1.5Thistestmethodcanbeconsideredanabsolute(orprimary)methodofmeasurement,sincenoreferencestandardsarerequired.Itisadvisabletousereferencematerialstoverifytheperformanceoftheinstrumentused.1.6ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.7Forsystemsemployinglasersaspowersources,itisimperativethatthesafetyrequirementbefullymet..1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A42
【国际标准分类号】:17_200_10
【页数】:11P.;A4
【正文语种】:英语