ASTM_D_5428_-_08_2013.pdf

Designation:D542808(Reapproved 2013)Standard Practice forEvaluating the Performance of Inflatable Restraint Modules1This standard is issued under the fixed designation D5428;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice describes the procedures and conditionsused to evaluate the physical performance of inflatable restraintmodules and module components during and after deployment.1.2 The physical performance characteristics that may beobtained by this practice are internal cushion pressures deter-mined by instrumentation,cushion geometries determined byhigh-speed photography,and material integrity determined byvisual inspection.1.3 This practice is applicable to driver and passenger sideinflatable restraint modules.1.4 Procedures and apparatus other than those stated in thispractice may be used by agreement between the purchaser andthe supplier with the specific deviations from the practiceacknowledged in the report.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not exact equivalents;therefore,each systemmust be used independent of the other.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD6799 Terminology Relating to Inflatable Restraints2.2 Federal Standard:3CFR 49 Code of Federal Regulations2.3 SAE Standard:4J211 Instrumentation for Impact Test3.Terminology3.1 Definitions:3.2 For all terminology relating to D13.20,InflatableRestraints,refer to Terminology D6799.3.2.1 The following terms are relevant to this standard:breakout pressure,cushion,deployment,inflatable restraint,inflator,maximum inflation pressure,module3.3 For all other terms related to textiles,see TerminologyD123.4.Summary of Practice4.1 Inflatable restraint modules are mounted into a test standthat allows for deployments under conditions that duplicate orclosely resemble the conditions in a vehicle.4.2 Instrumentation within the test stand charts inflationpressures versus time.High-speed photography visually cap-tures changing cushion geometries over time.4.3 Module deployments are reviewed for pressure and timerelationships,cushion geometries at one or more times duringthe cycle,and post-inflation material analysis.5.Significance and Use5.1 This practice is intended to be a general guideline forrepetitive testing,safe conduct of tests,and accurate datacollection for inflatable restraints.5.2 This practice may be used by the purchaser and thesupplier to establish the criteria by which inflatable restraintmodules will be tested by the supplier to determine whether alot of material is acceptable for shipment to the purchaser.5.3 Unless otherwise specified by agreement between thepurchaser and the supplier,this practice shall constitute the testconditions,procedures,and equipment by which inflatablerestraint modules are deployed for testing.It is intended to beused as a guideline in establishing a written material specifi-cation or equivalent agreement between the purchaser and thesupplier.The specification may deviate from the practices1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved July 1,2013.Published September 2013.Originallyapproved in 1993.Last previous edition approved in 2008 as D5428 08.DOI:10.1520/D5428-08R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from the Superintendent of Documents,U.S.Government PrintingOffice,Washington,DC 20525.4Available from the Society of Automotive Engineers,400 CommonwealthDrive,Warrendale,PA 15096-0001.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 described herein when(based on experience)considerations offabric properties,material handling equipment,or inflatablerestraint system design dictate otherwise.6.Interferences6.1 The pressure transducer and pickup tube must bemounted in a position which does not interfere with theunfolding cushion.6.2 The pressure versus time data is subject to recordinganomalies and electronic noise.The data should be digitallyfiltered to obtain the underlying smooth pressure curve prior todata analysis.7.Apparatus7.1 Mou