ASTM_D_5822_-_13.pdf

Designation:D582213Standard Test Method forDetermining Seam Strength in Inflatable RestraintCushions1This standard is issued under the fixed designation D5822;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 measurement of seamefficiency and the maximum seam strength in inflatable re-straint cushions composed of woven fabrics when a force isapplied perpendicular to the seam,using a grab test.Forevaluating sewing thread,refer to Test Method D204.1.2 This test method is restricted to seams that are eitherobtained from an inflatable restraint cushion or preparedoff-line,specifically for testing,using fabric blanks,not ob-tained from a previously sewn cushion assembly.Seams mayinclude but are not limited to sewn,OPW,glued,sealed andsewn,or fused(chemically or thermally).This test method canbe used for either lot testing of production cushions,or forresearch and development purposes.1.3 This test method is used when the measurement of aresistance to a specified force,a breaking force,a minimumelongation,or a combination thereof are required to determinethe seam strength,or seam integrity of a particular fabric forinflatable restraint use.1.4 Procedures and apparatus other than those stated in thisstandard may be used by agreement between purchaser andsupplier with the specific deviations from the standard 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 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 TextilesD204 Test Methods for Sewing ThreadsD1776 Practice for Conditioning and Testing TextilesD6799 Terminology Relating to Inflatable Restraints3.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:seam efficiency,seam failure,seam strength.3.2 For all other terms related to textiles,see TerminologyD123.4.Summary of Test Method4.1 Specimens either taken from inflatable restraint cush-ions or made off-line using fabric blanks,specifically fortesting,are destructively tested in a tensile testing machineunder laboratory conditions to determine seam strength andseam efficiency and nature of the failure mode.5.Significance and Use5.1 Seam strength testing is used for design validation andfor lot acceptance.5.2 This test method constitutes the conditions,procedures,and equipment by which either seams taken from inflatablerestraint cushions,or seam types that can potentially be usedfor inflatable restraint cushions are tested for seam strength,seam efficiency,and failure mode.It is intended to be used asa guideline in establishing a written part specification or print.The specification or agreement of purchaser and supplier maydeviate from the procedures described herein when(based onexperience)considerations of equipment,cushion design,orother factors dictate otherwise.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.Current edition approved Jan.1,2013.Published February 2013.Originallyapproved in 1995.Last previous edition approved in 2008 as D5822 08.DOI:10.1520/D5822-13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 In cases of dispute arising from differences in reportedtest results when using this test method for acceptance testingof commercial shipments,the purchaser and the suppliershould perform comparative tests to determine if there is astatistical bias between their laboratories.Competent statisticalassistance is recommended for the investigation of bias.As aminimum,the two parties should take a group of test speci-mens from the same lot of fabric to be evaluated,which utilizea like seam assembly(or standard seam assembly)to achieveseam interaction.The test specimens should then be randomlyassigned in equal numbers to each laboratory for testing.If abias is found,either its cause must be determined andcorrected,or the purchaser an