1、Designation: D6479 11Standard Test Method forDetermining the Edgecomb Resistance of Woven FabricsUsed in Inflatable Restraints1This standard is issued under the fixed designation D6479; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, 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 test method covers the procedures for determiningthe resistance to edgecombing of a woven fabric u
3、sed ininflatable restraints.1.2 Procedures and apparatus other than those stated in thisstandard may be used by agreement of purchaser and supplierwith the specific deviations from the standard practice ac-knowledged in the report.1.3 The values stated in SI units are to be regarded asstandard. No o
4、ther units of measurement are included in thisstandard.1.4 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
5、 of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1776 Practice for Conditioning and Testing TextilesD123 Terminology Relating to TextilesD2904 Practice for Interlaboratory Testing of a Textile TestMethod that Produces Normally Distributed DataD2906 Practice for Sta
6、tements on Precision and Bias forTextiles3D5035 Test Method for Breaking Force and Elongation ofTextile Fabrics (Strip Method)D5822 Test Method for Determining Seam Strength inInflatable Restraint CushionsD6799 Terminology Relating to Inflatable RestraintsE691 Practice for Conducting an Interlaborat
7、ory Study toDetermine the Precision of a Test Method3. Terminology3.1 For all terminology relating to D13.20, Inflatable re-straints, refer to Terminology D6799.3.1.1 The following terms are relevant to this standard:edgecombing, inflatable restraint, seam slippage, yarn slippage3.2 For all other te
8、rms related to textiles, see TerminologyD123.3.3 Definitions:3.4 For definitions of other terms used in this standard, referto Terminology D123 and Terminology D6799.4. Summary of Test Method4.1 One end of a test specimen is clamped within one jaw ofa CRE tensile testing machine and a special fixtur
9、e pierces arow of equally spaced needle holes through the opposite end ofthe specimen. In accordance with Test Method D5035, a tensileforce is applied to the specimen until rupture occurs. Themeasurement of the force required to cause rupture is themeasurement of edgecomb resistance.5. Significance
10、and Use5.1 A measurement of a fabrics edgecomb resistance indi-cates the relative tendency of a fabric to pull apart under seamstress or similar action. The related concepts of yarn slippageand seam slippage are limited to sewn seams, whereas themeasurement of edgecomb resistance is made at the edge
11、 of acut part in the absence of a sewn seam. The absence of a sewnseam in this test method eliminates the effect that a particularstitch might have on the tendency of a yarn to slip near an edgeof a cut part5.2 This test method is useful for material design evalua-tions in such applications as airba
12、gs in which seam stress is amajor concern.5.3 This method may be used as a complement to TestMethod D5822.6. Apparatus6.1 Tensile Testing MachineA constant-rate-of-extension(CRE) type, that is designed for the tensile forces anticipated,that is operated at a rate of 200 6 10 mm/min, that has a force
13、range selected such that the anticipated break occurs between1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand are the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved May 1, 2011. Published May 2011. Originallyapproved in
14、1999. Last previous edition approved in 2008 as D6479 08. DOI:10.1520/D6479-11.2For 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 o
15、nthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.10 and 90 % of full scale load, and that has jaws and grip facesas agree
16、d upon by purchaser and supplier.6.2 Clamps, jaws with smooth, flat, parallel faces a mini-mum of 60 mm wide by 25 mm tall. The jaws may be paddedor coated under the jaw face area.6.3 Fixture, compatible with tensile tester, equipped withtwelve equally spaced 1 mm diameter pins, 8 mm in length andco
17、rresponding 1.5 mm diameter holes with a stop located 5 mmfrom the center of the holes (Fig. 1).6.4 Load Cell, whose rated capacity is between 110 and1000 % of expected stripping load. A2000 N load cell isgenerally used for inflatable restraints.6.5 For inflatable restraints, all test equipment used
18、 inaccordance with this test method shall be certified for calibra-tion annually by an independent agency or equipment manu-facturer whose results are traceable to National Institute ofScience and Technology (NIST) or other national standardslaboratory. The test parameters of the equipment shall be
19、testedwithin the operating ranges covered in the cushion specifica-tion or equivalent document.7. Sampling and Specimen Preparation7.1 Edgecomb resistance testing is a destructive test. If usedin conjunction with lot testing, sampling is required.7.2 For acceptance testing the lot size is the number
20、 of rollsof fabric produced in one production day, or as specified in theapplicable material specification.7.3 From the end of each roll of fabric taken from the lotsample, cuta1mlong, full width sample of fabric.7.4 From the laboratory sample, select five test specimenseach from the warp and fill d
21、irections (Fig. 2).7.5 Without sealing or unraveling the edges, cut eachspecimen 50 6 1 mm wide and 300 6 5 mm long, with thelong dimension parallel to the warp yarns for a warp-orientedtest, and parallel to the fill yarns for a fill-oriented test.8. Conditioning8.1 Specimens for edgecomb resistance
22、 testing shall beconditioned at the standard atmosphere for testing textiles forat least 4 h prior to test in accordance with Test Method D1776.9. Procedure9.1 Prepare the tensile testing machine in accordance withTest Method D5035.9.2 Set the gage length between clamps at 200 61 mm.9.3 Select the f
23、orce range of the testing machine for thebreak to occur between 10 and 90 % of full-scale force.Calibrate or verify the testing machine for this range.9.4 Set the testing machine for a loading rate of 200 6 10mm/min.9.5 Ensure proper clamping as directed by Test MethodD5035.9.6 Mount one end of the
24、specimen into the bottom clampposition of the edgecomb fixture, ensuring that the end of theFIG. 1 FixtureD6479 112specimen abuts flatly and evenly against the alignment block,parallel to and behind the pinholes.9.7 Pierce the end of the specimen with the 12 1.0 mm pinsand secure the hinge.9.8 Mount
25、 the opposite end of the specimen securely in theopposite clamp of the testing machine in accordance with TestMethod D5035. Ensure that the specimen is not pulled and theyarns displaced.9.9 Operate the machine and break the specimen in accor-dance with Test Method D5035.9.10 Record the breaking forc
26、e separately for both the warpand fill directions. Determine the median of the break forcesobserved for all specimens tested.10. Report10.1 State that the tests were conducted in accordance withthis test method.10.2 If deviation from this test method occurred, anyreference to this standard shall sta
27、te: “Testing was performed inaccordance with ASTM D6479, with the following changes:”10.3 The purchaser and supplier shall determine the exactform of the test report. Unless otherwise specified, the formshall provide the following information:10.3.1 Lot identification,10.3.2 Date of report,10.3.3 Na
28、me of person certifying report,10.3.4 Relevant specification,10.3.5 Number of specimens used in each test10.3.6 Tests performed and data obtained,10.3.7 Laboratory conditions if other than standard, and10.3.8 Deviations from standard procedures and apparatus.11. Precision and Bias11.1 An interlabora
29、tory test was conducted in accordancewith Practice D2904 and Practice E691. A precision and biasstatement based on the interlaboratory report is being devel-oped in accordance with Practice D2906.12. Keywords12.1 airbag; break force; edgecomb resistance; inflatablerestraintFIG. 2 Test SpecimensD6479
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33、mittee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D6479 114
