1、Designation: D 5807 08Standard Practice forEvaluating the Overpressurization Characteristics ofInflatable Restraint Cushions1This standard is issued under the fixed designation D 5807; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, 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 covers the procedures and conditions usedto evaluate the physical performance of inflatabl
3、e restraintcushions during and after overpressurization testing at elevatedpressures capable of causing cushion bursting using air pres-surization equipment.1.2 The physical performance characteristics that may beobtained in conjunction with this practice are internal cushionpressures determined by
4、instrumentation and material integrity,determined by visual inspection.1.3 This practice is applicable to all inflatable restraintcushions.1.4 Procedures and apparatus other than those stated in thispractice may be used by agreement between purchaser andsupplier with the specific deviations from thi
5、s practice ac-knowledged 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 independently of the other.1.6 This standard does not purport to
6、 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. See Section 8 forspecific hazard information.2. Ref
7、erenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 6799 Terminology Relating to Inflatable Restraints3. Terminology3.1 Definitions:3.2 For all terminology relating to D13.20, Inflatable Re-straints, refer to Terminology D 6799.3.2.1 The following terms are relevant to this
8、standard:cushion, cushion overpressurization, deployment, inflatablerestraint, module, standard atmosphere for testing textiles.3.3 For all other terms related to textiles, see TerminologyD 123.4. Summary of Practice4.1 Inflatable restraint cushions are tested under laboratoryconditions to evaluate
9、cushion integrity when exposed tointernal cushion pressures greater than deployment pressures.If cushion rupture occurs, the rupture pressure, time to rupture,and mode of rupture are recorded.4.2 Inflatable restraint cushions are mounted into a teststand that allows for inflations under conditions t
10、hat exceeddeployment pressures. Instrumentation within the test standcharts inflation pressures versus time and may allow forphotographic review of the overpressurization sequence.4.3 Cushion overpressurization results are reviewed forpressure and time relationships, and post-inflation materialanaly
11、sis.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. Cushion overpressurizationtesting may be used for design and production validation, formanufacturing process control
12、, for lot acceptance, or for acombination thereof.5.2 This practice constitutes the conditions, apparatus, andprocedures by which inflatable restraints are commonly testedfor cushion overpressurization. It is intended to be used as aguideline in establishing a cushion specification or equivalentdocu
13、ment. The practices in the specification may deviate fromthe practices described herein when (based on experience)considerations of equipment, cushion design, or other factorsdictate otherwise.1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility o
14、f Subcommittee D13.20 on Inflatable Restraints.Current edition approved July 1, 2008. Published July 2008. Originally approvedin 1995. Last previous edition approved in 2007 as D 5807 02 (2007).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at s
15、erviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3 There exists a large variety in cushion configur
16、ationsand equipment designs, obviating a standard test method forcushion overpressurization. Therefore, a cushion specificationshould incorporate the practices stated herein when describinga test method for testing a specific cushion geometry andapparatus design. To ensure accuracy and repeatability
17、, thespecification should also address precision and bias in amanner consistent with ASTM prescribed procedures andconsistent with the particular cushion geometry, equipment inuse, and test procedures.5.3.1 Sources of variation in cushion overpressurizationtesting procedures include orifice size, at
18、tachment fixture,sensor location, method of attachment, presence or absence ofinternal bladder, accumulator size and pressure, transducertype and location, the presence or absence of tethers, presenceor absence of vent plugs, and the accuracy of timing devicesand pressure sensors. All sources of equ
19、ipment and proceduralvariation should be addressed in the applicable specification.5.4 In accordance with the applicable specification, cush-ions may be pressurized without bursting to determine theirresistance to a fixed level of high internal pressure, or they maybe subjected to increasing pressur
20、es to determine their ultimatebursting strength.6. Apparatus6.1 Plastic Liner Bags, with a combined bursting strength of3.5 kPa (0.5 psi) or less for use as optional bladders to aid inthe bursting of cushions whose fabric permeability is too highto permit ultimate bursting strength testing without t
21、hem.6.2 Patches or Plugs, to seal cushion vents, if cushionbursting is required and cushion overpressurization testingequipment does not provide the required air volume forbursting.6.3 Pressure Vessel, capable of being charged pneumaticallyfrom 0 to no less than 865 kPa (0 to no less than 125 psi) w
22、itha tolerance of 63 %, of sufficient volume to adequatelychallenge the volume of the cushion being tested, and equippedwith intake and outlet air lines and a quick-release solenoidvalve.6.4 Mounting Fixture, capable of retaining the cushionassembly by its attachment points without damaging thecushi
23、on material, in an orientation for free expansion of thecushion geometry, and with sufficient shielding for operatorprotection if the cushion overpressurization testing unit is notphysically isolated in a separate room from the operator duringactuation.6.5 Pressure Transducer and Pickup Tube, suitab
24、le formeasuring pressures inside the cushion from 0700 kPa (0100psi) with a tolerance of 63 %, mounted in a static or lowpressure area in the test fixture that does not interfere withcushion overpressurization.6.6 Data Acquisition System, suitable for recording theoutput of the pressure transducer v
25、ersus elapsed time ofoverpressurization (optional).6.6.1 Filter requirements, data sampling rate, transducerfrequency response, and amplifier frequency response shall besuch that minimal effect on accuracy of the data occurs.Overall accuracy of the data acquisition system shall be within63%.6.7 Elec
26、trical Firing Pulse Source, suitable for actuating theinflation and for communicating with the data acquisitionsystem dependent on an electrical signal.6.8 Film or Tape Video System, suitable for recording thecushion geometry or mode of rupture during overpressurizationat 1000 or more frames per sec
27、ond, and capable of beingsynchronized precisely with a firing pulse (optional).6.9 Lighting System, suitable for high resolution photogra-phy (optional).7. Interferences7.1 The pressure transducer and/or pickup tube within themounting fixture must be mounted in a position that does notinterfere with
28、 the unfolding cushion.7.2 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.8. Hazards8.1 Personnel conducting cushion overpressurization testingin the same r
29、oom as the testing unit must be equipped with theappropriate safety equipment and safety training. Examples ofthe necessary safety equipment include, but are not limited to,ear protection, equipment shielding, and safety glasses. Properwritten safety procedures shall be provided to all test personne
30、lfor compliance with standard industry practices. There shall becompliance to all applicable Occupational Safety and HealthAssociation (OSHA) standards.9. Sampling9.1 Cushion overpressurization testing is a destructive testand therefore necessitates sampling procedures if used inconjunction with lot
31、 acceptance.9.2 For acceptance testing, the lot size is the quantity ofcushions sewn on one production line in one production day.9.3 Lot SampleFor acceptance testing, take at random thenumber of cushions directed in an applicable cushion specifi-cation or other agreement between purchaser and suppl
32、ier.Consider cushions to be the primary sampling units.9.4 Each cushion in the lot sample is a test specimen.10. Equipment Calibration10.1 For inflatable restraints, all test equipment used inaccordance with this practice shall be certified for calibrationannually by an independent agency or equipme
33、nt manufacturerwhose results are traceable to the National Institute of Scienceand Technology (NIST) or other national standards laboratory.The test parameters of the equipment shall be tested within theoperating ranges covered in the cushion specification orequivalent document.11. Conditioning11.1
34、Conditioning of specimens for cushion overpressuriza-tion testing is conducted at the standard atmosphere for testingtextiles for at least 4 h prior to test.12. Procedures12.1 Select and condition cushion specimens in accordancewith Sections 11 and 9.D580708212.2 If cushion bursting is intended and
35、cushion overpres-surization testing equipment does not provide the required airvolume for bursting, seal the cushion vents with a plug or witha sewn fabric patch made of the same material as the cushion.12.3 Mount the cushion specimen on the test fixture, ensur-ing that the retention mechanism does
36、not damage the cushionmaterial, and that the pressure transducer and pickup tube donot interfere with the inflation of the cushion.12.4 Install a protective screen around the test fixture, ifneeded.12.5 Perform all system calibrations.12.6 Verify proper framing rate, camera settings, and light-ing i
37、ntensity levels, if needed.12.7 Enter the test serial number into recording portions ofthe data acquisition and video systems.12.8 Ensure the pressure vessel is pressurized sufficiently toevaluate the cushion under test.12.9 Turn on the warning light before arming the pressur-ization switch.12.10 In
38、itiate the starting sequence and note the response ofthe data acquisition system to verify successful pressurization.12.11 Pressurize the cushion until it reaches the pre-setinternal pressure or until it ruptures, as specified.12.12 Record test measurements such as maximum cushionpressure in kPa (ps
39、i), time to maximum cushion pressure inm/s, or the location and nature of the cushion rupture, asspecified.12.13 De-arm the starting switch and remove the cushionfrom the test stand.13. Report13.1 State that the tests were conducted in accordance withPractice D 5807 for evaluating the overpressuriza
40、tion charac-teristics of inflatable restraint cushions.13.1.1 If deviation from Practice D 5807 occurred, anyreference to this practice shall state: “Testing was performed inaccordance with Practice D 5807, with the following changes:13.2 The purchaser and supplier determine the exact form ofthe tes
41、t report. Unless otherwise specified, the form shallprovide the following information:13.2.1 Cushion designation(s),13.2.2 Lot identification,13.2.3 Date of report,13.2.4 Name of person certifying report,13.2.5 Relevant specification,13.2.6 Number of specimens used in each test,13.2.7 Tests performe
42、d and data obtained,13.2.8 Laboratory conditions if other than standard, and13.2.9 Deviations from standard procedures and apparatus.14. Keywords14.1 airbag; bag burst; cushion; inflatable restraint; ruptureASTM International takes no position respecting the validity of any patent rights asserted in
43、 connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the re
44、sponsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive care
45、ful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM Internationa
46、l, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D5807083
