1、Designation:D7506/D7506M17(Reapproved 2021)Standard Test Method forPocket Reinforcement1This standard is issued under the fixed designation D7506/D7506M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A numb
2、er in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method utilizes the grab procedures to deter-mine localized weakness due to bar-tacking in the pocket areasof all types of garments.T
3、his can be utilized to test bar-tackingin the pockets of shirts,as well as side or back pockets oftrousers,pants,or jeans.1.2 This test method provides the values in both inch-poundand SI units.Inch-pound units is the technically correct namefor the customary units used in the United States.SI units
4、 is thetechnically correct name for the system of metric units know asthe International System of Units.The values stated in eitheracceptable metric units or in other units shall be regardedseparately as standard.The values stated in each system maynot be exact equivalents;therefore,each system must
5、 be usedindependently of the other,without combining in any way.1.3 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-mi
6、ne the applicability of regulatory limitations prior to use.1.4 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
7、issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D76/D76M Specification for Tensile Testing Machines forTextilesD123 Terminology Relating to TextilesD1776/D1776M Practice for Conditioning and Testing Tex-tilesD5034 Test Method
8、for Breaking Strength and Elongation ofTextile Fabrics(Grab Test)3.Terminology3.1 Definitions3.1.1 constant-rate-of-extension tensile testing machine(CRE),na testing machine in which the rate of increase ofspecimen length is uniform with time.3.1.2 grab test,nin fabric testing,a tensile test in whic
9、hthe central part of the width of the specimen is gripped in theclamps.3.1.3 tensile test,nin textiles,a test in which a textilematerial is stretched in one direction to determine the loadelongation characteristics,in the breaking load,or the breakingelongation.3.1.4 For definitions of other terms u
10、sed in this test method,refer to Terminology D123.4.Summary of Test Method4.1 A specimen of the pocket area with the bar-tacking ismounted centrally in clamps of the tensile strength machineand a force is applied until the specimen breaks.5.Apparatus5.1 Constant-rate-of-extension(CRE)tensiletestingm
11、achine,as used in Test Method D5034,conforming toSpecification D76/D76M.5.2 Clamps and jaws,rubber faced or other grippingsurfacejaw faces must measure 25 mm 6 1 mm 1.0 in.60.02 in.wide at least 25 mm 1.0 in.,perpendicular to thedirection of the force,and not less than 25 mm nor more than50 mm 1.0 i
12、n.nor more than 2.0 in.The back,or bottom,jawface of each clamp shall be at least as large as its mate.Use ofa larger face for the second jaw reduces the problem of frontand back jaw face misalignment.6.Safety Precautions6.1 It is the users responsibility to use safe and propertechniques when handli
13、ng or using any of the equipmentmentioned.6.2 Good laboratory practice should be followed.Wearsafety glasses in all laboratory test rooms.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.54 on Subassemblies.Current editi
14、on approved July 1,2021.Published August 2021.Originallyapproved in 2009.Last previous edition approved in 2017 as D7506/D7506M-17.DOI:10.1520/D7506_D7506M-17R21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of A
15、STMStandards 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 StatesThis international standard was developed in accordance with internationally recognized principl
16、es 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.17.Sampling,Test Specimens,and Test Units7.1 Cut the garment or the side pockets as shown in Figs.1-4.If multiple samples are available,cut,if possible,aminimum of three specimens.If not,test an agreed uponnumber of samples.8.Preparation of Apparatus8.1 Tensile Testing Machine:8.1.
