1、Designation: D 6479 02 (Reapproved 2007)Standard Test Method forDetermining the Edgecomb Resistance of Woven FabricsUsed in Inflatable Restraints1This standard is issued under the fixed designation D 6479; the number immediately following the designation indicates the year oforiginal adoption or, in
2、 the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the procedures for determiningthe resistance to edgecombin
3、g of a woven fabric used 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 either SI units or inch
4、-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.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibil
5、ity 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:2D 1776 Practice for Conditioning and Testing TextilesD 123 Terminology Relating to TextilesD 2904
6、Practice for Interlaboratory Testing of a Textile TestMethod that Produces Normally Distributed DataD 2906 Practice for Statements on Precision and Bias forTextilesD 5035 Test Method for Breaking Force and Elongation ofTextile Fabrics (Strip Method)D 5822 Test Method for Determining Seam Strength in
7、Inflatable Restraint CushionsD 6799 Terminology Relating to Inflatable RestraintsE 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 Definitions:3.2 For definitions of other terms used in this standard, referto Terminology D 123 and Term
8、inology D 6799.4. Summary of Test Method4.1 One end of a test specimen is clamped within one jaw ofa CRE tensile testing machine and a special fixture pierces arow of equally spaced needle holes through the opposite end ofthe specimen. In accordance with Test Method D 5035,atensile force is applied
9、to the specimen until rupture occurs.The measurement of the force required to cause rupture is themeasurement of edgecomb resistance.5. Significance 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
10、. The related concepts of yarn slippageand seam slippage are limited to sewn seams, whereas themeasurement of edgecomb resistance is made at the edge 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
11、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 airbags in which seam stress is amajor concern.5.3 This method may be used as a complement to TestMethod D 5822.6. Apparatus6.1 Tensile Testing MachineA con
12、stant-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 (86 0.5 in./min),that has a force range selected such that the anticipated breakoccurs between 10 and 90 % of full scale load, and that hasjaws and grip faces as agree
13、d upon by purchaser and supplier.1This 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 July 1, 2007. Published August 2007. Originallyapproved in 1999. Last previous edit
14、ion approved in 2002 as D 6479 02.2For 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.1Copyright ASTM Internation
15、al, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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
16、equally spaced 1 mm diameter pins, 8 mm in length andcorresponding 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. A 2000 N load cell isgenerally used for inflatable restraint
17、s.6.5 For inflatable restraints, all test equipment used 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 standardsla
18、boratory. The test parameters of the equipment shall be 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 requir
19、ed.7.2 For acceptance testing the lot size is the number 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,
20、 select five test specimenseach from the warp and fill directions (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 t
21、est.8. Conditioning8.1 Specimens for edgecomb resistance testing shall beconditioned at the standard atmosphere for testing textiles forat least 4 h prior to test in accordance with Test MethodD 1776.9. Procedure9.1 Prepare the tensile testing machine in accordance withTest Method D 5035.9.2 Set the
22、 gage length between clamps at 200 61mm(460.1 in).9.3 Select the force 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 2006 10mm/min (8 6 0.5 in./min).9
23、.5 Ensure proper clamping as directed by Test MethodD 5035.9.6 Mount one end of the specimen into the bottom clampposition of the edgecomb fixture, ensuring that the end of theFIG. 1 FixtureD 6479 02 (2007)2specimen abuts flatly and evenly against the alignment block,parallel to and behind the pinho
24、les.9.7 Pierce the end of the specimen with the 12 1.0 mm pinsand secure the hinge.9.8 Mount the opposite end of the specimen securely in theopposite clamp of the testing machine in accordance with TestMethod D 5035. Ensure that the specimen is not pulled and theyarns displaced.9.9 Operate the machi
25、ne and break the specimen in accor-dance with Test Method D 5035.9.10 Record the breaking force 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 me
26、thod.10.2 If deviation from this test method occurred, anyreference to this standard shall state: “Testing was performed inaccordance with ASTM D 6479, with the following changes:”10.3 The purchaser and supplier shall determine the exactform of the test report. Unless otherwise specified, the formsh
27、all provide the following information:10.3.1 Lot identification,10.3.2 Date of report,10.3.3 Name 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.
28、3.8 Deviations from standard procedures and apparatus.11. Precision and Bias11.1 An interlaboratory test was conducted in accordancewith Practice D 2904 and Practice E 691 using TexPac.3Aprecision and bias statement based on the interlaboratory reportis being developed in accordance with Practice D
29、2906.12. Keywords12.1 airbag; break force; edgecomb resistance; inflatablerestraint3Available from ASTM International Headquarters. Order Adjunct No.ADJD2904.FIG. 2 Test SpecimensD 6479 02 (2007)3ASTM International takes no position respecting the validity of any patent rights asserted in connection
30、 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 responsible t
31、echnical 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 careful conside
32、ration 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 International, 100 Barr
33、 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).D 6479 02 (2007)4
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