ASTM_D_6479_-_15_2020.pdf

Designation:D647915(Reapproved 2020)Standard 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 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 test method covers the procedures for determiningthe resistance to edgecombing 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 SI units are to be regarded asstandard.No other 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.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Produces Normally Distributed Data(With-drawn 2008)3D2906 Practice for Statements on Precision and Bias forTextiles(Withdrawn 2008)3D5035 Test Method for Breaking Force and Elongation ofTextile Fabrics(Strip Method)D5822 Test Method for Determining Seam Strength inInflatable Restraint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 Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 For all terminology relating to D13.20,Inflatablerestraints,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 terms 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 fixture 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 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 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 airbags in which seam stress is amajor concern.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand are the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved Feb.15,2020.Published March 2020.Originallyapproved in 1999.Last previous edition approved in 2015 as D6479 15.DOI:10.1520/D6479-15R20.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.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