ASTM_D_6614_-_07_2015.pdf

Designation:D661407(Reapproved 2015)Standard Test Method forStretch Properties of Textile Fabrics CRE Method1This standard is issued under the fixed designation D6614;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 determination of the amountof fabric stretch and fabric growth after a specified extensionand held for a specified time.1.2 While this method can be used for any fabric,knitfabrics having high stretch are better measured by test methodD2594.1.3 This test method should not be used to measure thebreaking strength and elongation of woven fabrics,which iscovered in Test Methods D5034 and D5035.1.4 The values listed in either SI units or inch-pound unitsare to be regarded separately as the standard.Within the text,the inch-pound units are shown in parentheses.The valuesstated in each system are not exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith specification.1.5 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 TextilesD1776 Practice for Conditioning and Testing TextilesD2594 Test Method for Stretch Properties of Knitted FabricsHaving Low PowerD4849 Terminology Related to Yarns and FibersD4850 Terminology Relating to Fabrics and Fabric TestMethodsD5034 Test Method for Breaking Strength and Elongation ofTextile Fabrics(Grab Test)D5035 Test Method for Breaking Force and Elongation ofTextile Fabrics(Strip Method)3.Terminology3.1 For all terminology relating to D13.59,Fabric TestMethods,General,see Terminology D4850.3.2 For all terminology related to D13.58,Yarns and Fiber,see Terminology D4849.3.2.1 The following terms are relevant to this standard:fabric stretch,fabric growth,stretch yarn.3.3 For definitions of all other textile terms see TerminologyD123.4.Summary of Test Method4.1 Fabric Stretch and Fabric Growth A specified load isapplied to a fabric specimen,using a constant rate of extensiontensile tester at a prescribed rate of extension.After holding atthe specified load for a predetermined time,the length ismeasured.The load is removed from the specimen and allowedto relax for a specified time.A small amount of force,enoughto remove any wrinkles or folds,is applied and the specimenlength measured.The amount of fabric stretch is calculatedfrom the difference in length prior to load and under load.Fabric growth is calculated from the difference in length priorto loading and after relaxation.5.Significance and Use5.1 This method is used to determine the stretch and growthproperties which a garment made of the fabric may be expectedto exhibit during use.5.2 This is a new method and therefore the history of data isvery small,however the excellent agreement of between-laboratory data suggest this method may be considered foracceptance testing of commercial shipments.5.2.1 If there are differences of practical significance be-tween reported test results for two laboratories(or more),comparative test should be performed to determine if there is astatistical bias between them,using competent statistical assis-tance.As a minimum,samples used for such comparative testsshould be as homogeneous as possible,drawn from the samelot of material as the samples that resulted in disparate results1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.59 on Fabric Test Methods,General.Current edition approved July 1,2015.Published September 2015.Originallyapproved in 2000.Last previous edition approved in 2011 as D661407(2011).DOI:10.1520/D6614-07R15.2For 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 during initial testing,and randomly assigned in equal numbersto each laboratory.Other fabrics with established test valuesmay also be used for these comparative tests.The test resultsfrom the laboratories involved should be compared using astatistical test for unpaired data,at a probability level chosenprior to the testing series.If bias is found,either its cause mustbe found and corrected,or future test results must be adjustedin consideration of the known bias.6.Apparatus6.1 Tensile Test