ASTM D6476-2008 测定充气限制织物动态空气渗透性的标准试验方法

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【英文标准名称】:StandardTestMethodforDeterminingDynamicAirPermeabilityofInflatableRestraintFabrics
【原文标准名称】:测定充气限制织物动态空气渗透性的标准试验方法
【标准号】:ASTMD6476-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D13.20
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:airbag;inflatablerestraint;permeability;Dynamicairpermeability;Inflatablerestraints;Permeability;Restrainingmaterials/systems/tests
【摘要】:Formattersrelatingtolotacceptanceofcommercialshipmentsandconformitytospecificationorotherstandard,refertoSection13ofthistestmethod.Thistestmethodisusefulintheselectionanddesignvalidationofpermeable,uncoatablefabricsusedininflatablerestraintcushions.Thedynamicconditionsandhigherpressuredifferentialsofthistestmethodmaybettersimulatetheinflationanddeflationcycleofanairbagmoduleduringdeploymentthandothesteady-stateconditionsofTestMethodD737.5.2.1Onlyuncoated,permeablefabricsshouldbeused.Useofcoatedfabricsmayyieldinvalidresultsandpotentiallydamagethetestapparatus.WithinthelimitsofvarianceexpressedinSection12,thistestmethodisusefulfordesignvalidationandmaybesuitableforincorporationinamaterialspecificationorforlotacceptancetestingofcommercialshipments.Cautionisadvisedonverylowpermeabilityfabricsorwiththe200cm3.sizetestheatbecausebetween-laboratoryprecisionaspresentedinSection12maybeashighas21%.Thistestmethodmaybeusedformaterialsotherthaninflatablerestraintfabricswhichexperiencedynamicairpermeabilityinsuddenbursts.Insuchcases,thephysicalapparatusoritssoftwarealgorithmsmayrequiremodificationtoprovidesuitabilityforuse.Duetothesplit-secondtimeintervalfortesting,thepressureversustimedataissubjecttorecordinganomaliesandelectronicnoise.Thedatashouldbedigitallyfilteredtoobtaintheunderlyingsmoothpressurecurvepriortodataanalysis.Thesoftwareintheapparatusincludesareliablealgorithmbothtosmooththecurveandtodeterminetheexponentofairpermeability.Itisinherentinthedesignandoperationofthisequipmentthatmajorcomponentskeytothecalibrationandmeasurementsarespecifictotheindividualtesthead.Thesizeorpermeabilitymeasuringrangeofthetestheadistypicallychosentocorrespondtothefabricspecimentobetested.Theprecisionofthistestmethodishighlydependentonthesizeofthetesthead.Theprecisionofthedatacollectedusingonetestheadshouldbeusedtoestimatetheprecisionofdatacollectedusingadifferenttesthead,evenonthesameapparatus.Itismandatorythatfabricspecimensbeconditionedandtestedinstandardatmospherefortestingtextiles.1.1Thistestmethodcoverstheproceduresusedtodetermineunderdynamicairflowconditionsthehighpressurepermeabilityofpermeable,uncoatedfabricstypicallyusedforinflatablerestraints.Forthedeterminationofairpermeabilityofinflatablerestraintfabricsunderlowpressureconditionsatsteady-stateairflow,refertoTestMethodD737.1.2Proceduresandapparatusotherthanthosestatedinthistestmethodmaybeusedbyagreementofpurchaserandsupplierwiththespecificdeviationsfromthestandardacknowledgedinthereport.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:W59
【国际标准分类号】:59_080_30
【页数】:5P.;A4
【正文语种】:英语