ASTM E2191/E2191M-2010 声发射法检验充气长纤维缠绕复合材料压力容器的标准实施规程

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【英文标准名称】:StandardPracticeforExaminationofGas-FilledFilament-WoundCompositePressureVesselsUsingAcousticEmission
【原文标准名称】:声发射法检验充气长纤维缠绕复合材料压力容器的标准实施规程
【标准号】:ASTME2191/E2191M-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:E07.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:acousticemission;compositegascylinders;compositepressurevessel;flaws;gaspressurevessels;NGVtanks;Acousticemission(AE)testing--metals/metallicmaterials;Compositepressurevessels;Filament-woundpressurevessels;Gascylinders;Gas
【摘要】:Duetosafetyconsiderations,theCompressedGasAssociation(CGA)andothershaveproducedguidelineswhichaddressin-serviceinspectionofNGVfuelcontainers(see2.2-2.4).AEexaminationislistedasanalternativetotheminimumthree-yearvisualexaminationwhichgenerallyrequiresthatthecontainerberemovedfromthevehicletoexposetheentirecontainersurface.TheAEmethodallowsx201C;in-situx201D;examinationofthecontainer.Slow-fillpressurizationmustproceedatflowratesthatdonotproducebackgroundnoisefromflowofthepressurizingmedium.Acousticemissiondataarerecordedthroughoutapressurizationrange(thatis,50%to100%ofAEexaminationpressure).Fast-fillpressurizationcanbeusedifholdperiodsareprovided.Acousticemissiondataarerecordedonlyduringtheholdperiods.Note18212;Fast-fillpressurizationislessappropriateforcarbon(orgraphite)compositesduetothelowersensitivityofcarbonfiberstostressrupturecomparedtootherfibers.BackgroundnoiseabovethethresholdwillcontaminatetheAEdataandrenderthemuseless.Usersmustbeawareofthefollowingcommoncausesofbackgroundnoise:highfillrate(measurableflownoise);mechanicalcontactwiththevesselbyobjects;electromagneticinterference(EMI)andradiofrequencyinterference(RFI)fromnearbybroadcastingfacilitiesandfromothersources;leaksatpipeorhoseconnectionsandairborneparticles,insects,rainandsnow.Thispracticeshouldnotbeusedifbackgroundnoisecannotbeeliminatedorcontrolled.5.2Sensitivityisinfluencedbyfactorsthataffectelasticwavepropagation,sensorcouplingandsignalprocessorsettings.5.3ItispossibletomeasureAEfromAEsourcesthatcannotbeverifiedbyotherNDEmethods.1.1Thispracticeprovidesguidelinesforacousticemission(AE)examinationoffilament-woundcompositepressurevessels,forexample,thetypeusedforfueltanksinvehicleswhichusenaturalgasfuel.1.2Thispracticerequirespressurizationtoalevelequaltoorgreaterthanwhatisencounteredinnormaluse.Thetanks''pressurizationhistorymustbeknowninordertousethispractice.Pressurizationmediummaybegasorliquid.1.3Thispracticeislimitedtovesselsdesignedforlessthan690bar[10,000psi]maximumallowableworkingpressureandwatervolumelessthan1m3or1000L[35.4ft3].1.4AEmeasurementsareusedtodetectemissionsources.Othernondestructiveexamination(NDE)methodsmaybeusedtogainadditionalinsightintotheemissionsource.ProceduresforotherNDEmethodsarebeyondthescopeofthispractice.1.5Thispracticeappliestoexaminationofnewandin-servicefilament-woundcompositepressurevessels.1.6Thispracticeappliestoexaminationsconductedatambienttemperaturesabove20x00B0;C[70x00B0;F].Thispracticemaybeusedatambienttemperaturesbelow20x00B0;C[70x00B0;F]ifprovisionhasbeenmadetofilltothetank''sratedpressureat20x00B0;C[70x00B0;F].1.7Units8212;ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.8