标准资料网-标准资料免费资源平台

【英文标准名称】:StandardPracticeforInfraredFlashThermographyofCompositePanelsandRepairPatchesUsedinAerospaceApplications
【原文标准名称】:航空航天用合成板条和检修片红外闪热成像法的标准实施规程
【标准号】:ASTME2582-2007
【标准状态】:现行
【国别】:
【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】:E07.10
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:航空工程;航空航天运输;元部件;红外线;板条;检修;航天技术;温度记录
【英文主题词】:composite;flash;IR;nondestructive;thermography
【摘要】:FTistypicallyusedtoidentifyflawsthatoccurinthemanufactureofcompositestructures,ortotrackflawdevelopmentduringservice.FlawsdetectedwithFTincludedelamination,disbonds,voids,inclusions,foreignobjectdebris,porosityorthepresenceofwaterthatisincontactwiththebacksurface.Withdedicatedsignalprocessingandtheuseofrepresentativetestsamples,characterizationofflawdepthandsize,ormeasurementofcomponentthicknessandthermaldiffusivitymaybeperformed.SinceFTisbasedonthediffusionofthermalenergyfromtheinspectionsurfaceofthespecimentotheopposingsurface(orthedepthplaneofinterest),thepracticerequiresthatdataacquisitionallowssufficienttimeforthisprocesstooccur,andthatatthecompletionoftheacquisitionprocess,theradiatedsurfacetemperaturesignalcollectedbytheIRcameraisstrongenoughtobedistinguishedfromspuriousIRcontributionsfrombackgroundsourcesorsystemnoise.ThismethodisbasedonaccuratedetectionofchangesintheemittedIRenergyemanatingfromtheinspectionsurfaceduringthecoolingprocess.Astheemissivityoftheinspectionsurfacedeviatesfromidealblackbodybehavior(emissivity=1),thesignaldetectedbytheIRcameramayincludecomponentsthatarereflectedfromtheinspectionsurface.Mostcompositematerialscanbeexaminedwithoutspecialsurfacepreparation.However,itmaybenecessarytocoatlow-emissivity,opticallytranslucentinspectionsurfaceswithanopticallyopaque,high-emissivitywater-washablepaint.Thispracticeappliestothedetectionofflawswithaspectratiogreaterthanone.Thispracticeisbasedonthethermalresponseofaspecimentoalightpulsethatisuniformlydistributedovertheplaneoftheinspectionsurface.Toensurethat1-dimensionalheatflowfromthesurfaceintothesampleistheprimarycoolingmechanismduringthedataacquisitionperiod,theheightandwidthdimensionsoftheheatedareashouldbesignificantlygreaterthanthethicknessofthespecimen,orthedepthplaneofinterest.Thispracticeappliestoflatpanels,ortocurvedpanelswherethelocalsurfacenormalislessthan30degreesfromtheIRcameraopticalaxis1.1ThispracticedescribesaprocedurefordetectingsubsurfaceflawsincompositepanelsandrepairpatchesusingFlashThermography(FT),inwhichaninfrared(IR)cameraisusedtodetectanomalouscoolingbehaviorofasamplesurfaceafterithasbeenheatedwithaspatiallyuniformlightpulsefromaflashlamparray.1.2ThispracticedescribesestablishedFTtestmethodsthatarecurrentlyusedbyindustry,andhavedemonstratedutilityinqualityassuranceofcompositestructuresduringpost-manufacturingandin-serviceexaminations.1.3Thispracticehasutilityfortestingofpolymercompositepanelsandrepairpatchescontaining,butnotlimitedto,bismaleimide,epoxy,phenolic,poly(amideimide),polybenzimidazole,polyester(thermosettingandthermoplastic),poly(etheretherketone),poly(etherimide),polyimide(thermosettingandthermoplastic),poly(phenylenesulfide),orpolysulfonematrices;andalumina,aramid,boron,carbon,glass,quartz,orsiliconcarbidefibers.Typicalas-fabricatedgeometriesincludeuniaxial,crossplyandangleplylaminates;aswellashoneycombcoresandwichcorematerials.1.4Thispracticehasutilityfortestingofceramicmatrixcompositepanelscontaining,butnotlimitedto,siliconcarbide,siliconnitrideandcarbonmatrixandfibers.1.5Thispracticeappliestopolymerorceramicmatrixcompositestructureswithinspectionsurfacesthataresufficientlyopticallyopaquetoabsorbincidentlight,andthathavesufficientemissivitytoallowmonitoringofthesurfacetemperaturewithanIRcamera.Excessivelythick......
【中国标准分类号】:V22
【国际标准分类号】:49_035
【页数】:6P.;A4
【正文语种】:


Product Code:SAE J195
Title:Automatic Vehicle Speed Control-Motor Vehicles
Issuing Committee:Controls And Displays Standards Committee
Scope:The purpose of this SAE Recommended Practice is to provide a series of engineering guidelines for the design of an automatic vehicle speed control, and to define the minimum control performance which a device must provide in order to be classified an automatic vehicle speed control. An automatic vehicle speed control is a device capable of maintaining selected vehicle speeds in the presence of changing road load conditions. This SAE Recommended Practice is intended to apply only to the design of an automatic vehicle speed control. It is not intended to encourage or discourage the installation of automatic vehicle speed controls on any class of vehicles, nor is it intended to influence the requirements of engine speed governors.