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Product Code:SAE J2405
Title:Low-Permeation Fuel Fill and Vent Tube
Issuing Committee:Non-Hydraulic Hose Committee
Scope:This SAE Standard covers the minimum requirements for a low-permeation tubing (100 g/m2 day or less) for use as a low pressure (14.5 kPa) liquid- or vapor-carrying component for use in gasoline or diesel fuel filler, vent, and vapor systems. The construction shall be designed to be functional over a temperature range of --40 C to 100 C for the T1 designation, or --40 C to 125 C for the T2 designation.【英文标准名称】:StandardPracticeforConstructionofaSteppedBlockandItsUsetoEstimateErrorsProducedbySpeed-of-SoundMeasurementSystemsforUseonSolids
【原文标准名称】:阶梯形砌块的结构和固体用声速测量系统对砌块进行检验产生的评估错误
【标准号】:ASTME1544-1999(2004)e1
【标准状态】:现行
【国别】:
【发布日期】:1999
【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】:E28.13
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:超声检验;无损检验;玻璃;试验
【英文主题词】:acousticvelocity;elasticmoduli;materialscharacterization;referencestandard;residualstress;speedofsound;stressmeasurement;ultrasonics
【摘要】:Theuseofsoundspeedvaluestodeterminechangesintheelasticconstantsduetoappliedorresidualstressrequiresthatsuchmeasurementsbeofhighprecisionandlowbias.Forthatreason,specialevaluationteststodeterminearepresentativeprecisionandbiasforthespecifictechnique,method,andequipmentsetupusedaregiven.Speedofsoundisameasurethatdependsontheaccuratemeasurementsoflengthofpathoftravelandtransittimeorotherrelatedparameterssuchasfrequency,etc.Bothmeasurementsaresubjecttocertaininterpretationsandassumptionsandarehighlydependentonlaboratoryexpertise.Thispracticeprovidesameansofcheckingoveralltechnique.Thispracticeshallbeusedwhenitisnecessarytoassessthesystematicandrandomerrorsassociatedwithaparticularspeedofsoundmeasurementinasolidmedium.Itcanbeusedtocheckbothequipmentperformanceandmeasurementtechniquefortheseerrors.Itcanalsobeusedtostudyinherenterrorsinaparticularmethod.ItcanalsobeusedtoassessproposedcorrectionstosoundspeedmeasurementssuchasthephasecorrectionsofPapadakis(3,4).Theresultantprecisionandbiasdeterminedbytheuseofthedescribedblockrepresentsamoreidealsituationthanthesamemeasurementperformedinpractice,inthefield.Thus,theerrorforthespecificfieldmeasurementmaybelargerthanindicatedbythistest.Thistestrepresentsthebesterrorconditionforagiventechniqueandpractice.1.1Thispracticeprovidesameansforevaluatingbothsystematicandrandomerrorsforultrasonicspeed-of-soundmeasurementsystemswhichareusedforevaluatingmaterialcharacteristicsassociatedwithresidualstressandwhichmayalsobeusedfornondestructivemeasurementsofthedynamicelasticmoduliofmaterials.Importantfeaturesandconstructiondetailsofareferenceblockcrucialtotheseerrorevaluationsaredescribed.Thispracticecanbeusedwhenevertheprecisionandbiasofsoundspeedvaluesareinquestion.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q17
【国际标准分类号】:
【页数】:6P.;A4
【正文语种】: