1、Designation:D496496(Reapproved 2020)Standard Test Method forTension and Elongation of Elastic Fabrics(Constant-Rate-of-Extension Type Tensile Testing Machine)1This standard is issued under the fixed designation D4964;the number immediately following the designation indicates the year oforiginal adop
2、tion 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 tension andelongation of wide or nar
3、row elastic fabrics made from naturalor man-made elastomers,either alone or in combination withother textile yarns,when tested with a constant-rate-of-extension(CRE)type tensile testing machine.NOTE1For determination of similar testing using the constant-rate-of-load(CRL)type tensile testing machine
4、,refer to Test Method D1775.1.2 The use of this test method requires the selection of,ormutual agreement upon,loop tension(s)and elongation(s)atwhich the test results will be determined.1.3 Laundering procedures require mutual agreement on theselection of temperature and number of washing cycles and
5、drying cycles to be used.1.4 The values stated in SI units or inch-pound units are tobe regarded separately as standard.The values stated in eachsystem may not be exact equivalents;therefore each systemmust be used independently of the other,without combiningvalues in any way.1.5 This standard does
6、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.1.6 This international stan
7、dard 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.Refer
8、enced Documents2.1 ASTM Standards:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD1775 Test Method for Tension and Elongation of WideElastic Fabrics(Withdrawn 2000)3D1776 Practice for Conditioning and Testing TextilesD4850 Terminology Relating to Fab
9、rics and Fabric TestMethods3.Terminology3.1 For all terminology related to Subcommittee D13.59 onFabric Test Methods,General,see Terminology D4850.3.2 The following terms are relevant to this standard:constant-rate-of-extension tensile testing machine(CRE),constant-rate-or-load tensile testing machi
10、ne(CRL),elasticfabric,elongation,extension,extension-recovery cycle,force,loop tension,narrow elastic fabric,tension,tension-recoverychart,tension test,wide elastic fabric.3.3 For definitions of all other textile terms see TerminologyD123.4.Summary of Test Method4.1 Loop Tension at Specified Elongat
11、ion(s)Aconditionedloop specimen is mounted in a CRE-type tensile testingmachine.The specimen is then extended at a specified rate toa specified loop tension,and returned at a specified rate to zerotension.The cycle is repeated two more times to give a total ofthree cycles.During the test,extension-r
12、ecovery curves may beplotted by an automatic recorder for all or only the third cycle.1This 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 1,2020.Published Augu
13、st 2020.Originallyapproved in 1989.Last previous edition approved in 2016 as D4964 96(2016).DOI:10.1520/D4964-96R20.2For 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 s
14、tandards 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 wi
15、th 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.1The tension at specified percent elongation
16、(s)is calculatedfrom the graph of the third cycle or obtained from theinstrument.4.2 Elongation at Specified Loop TensionA conditionedloop specimen is mounted in a CRE-type tensile testingmachine.The specimen is then loaded at a specified rate to aspecified loop tension,and unloaded at a specified rate to zeroloop tension.The cycle is repeated two more times to give atotal of three cycles.During the test,tension-recovery curvesmay be plotted by an automatic recorder for all or only the thirdcycl
