1、Designation:D496496(Reapproved 2012)1Standard 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 ado
2、ption 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.1NOTEA reference in 9.2.1 and the explanation for variable E in 12.1.1 were corrected edi
3、torially in March 2013.1.Scope1.1 This test method covers the measurement of tension andelongation of wide or narrow 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 m
4、achine.NOTE1For determination of similar testing using the constant-rate-of-load(CRL)type tensile testing machine,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
5、.3 Laundering procedures require mutual agreement on theselection of temperature and number of washing cycles anddrying 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;theref
6、ore each systemmust be used independently of the other,without combiningvalues in any way.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
7、and determine the applica-bility of regulatory limitations prior to use.2.Referenced 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for TextilesD123 Terminology Relating to TextilesD1775 Test Method for Tension and Elongation of WideElastic Fabrics(Withdrawn 2000)3D1776
8、Practice for Conditioning and Testing TextilesD4850 Terminology Relating to Fabrics 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-ext
9、ension tensile testing machine(CRE),constant-rate-or-load tensile testing machine(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 se
10、e TerminologyD123.4.Summary of Test Method4.1 Loop Tension at Specified Elongation(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 rep
11、eated two more times to give a total ofthree cycles.During the test,extension-recovery curves may beplotted by an automatic recorder for all or only the third cycle.The tension at specified percent elongation(s)is calculatedfrom the graph of the third cycle or obtained from theinstrument.4.2 Elongat
12、ion 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.
13、During the test,tension-recovery curvesmay be plotted by an automatic recorder for all or only the third1This 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 1,2
14、012.Published August 2012.Originallyapproved in 1989.Last previous edition approved in 2008 as D4964 96(2008)2.DOI:10.1520/D4964-96R12E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume info
15、rmation,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 States1 cycle.The elongation at a specifie
16、d loop tension is calculatedfrom the graph of the third cycle or obtained from theinstrument.5.Significance and Use5.1 This test method for testing loop tension and elongationof elastic fabrics is considered satisfactory for acceptancetesting of commercial shipments of elastic fabrics because thetest method is used in the trade for acceptance testing.5.1.1 In case of a dispute arising from differences inreported test results when using this test method for acceptancetesting of commercial shipmen