1、Designation:D7506/D7506M17Standard 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 number in parentheses
2、 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.This can be utiliz
3、ed 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 is thetechnially
4、 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 be usedindependen
5、tly 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 and health practices and determine the applica-bility of regulato
6、ry 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 issued by the World Trade Organi
7、zation TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD5034 Test Method for Breaking Strength and Elongation ofTexti
8、le 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 whichthe central part of the width of the specim
9、en 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 used in this test method,refer to Terminology
10、 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.Apparatus5.1Constant-rate-of-extension(CRE)tensile testingmachine,as used in Test Method D5034,conformi
11、ng toSpecification D76.5.2 Clamps and jaws,rubber faced or other grippingsurfacejaw faces must measure 25 6 1 mm(1.0 6 0.02 in.)wide at least 25 mm(1.0 in.),perpendicular to the direction ofthe force,and not less than 25 nor more than 50 mm(1.0 normore than 2.0 in.).The back,or bottom,jaw face of ea
12、ch clampshall be at least as large as its mate.Use of a larger face for thesecond jaw reduces the problem of front and back jaw facemisalignment.6.Safety Precautions6.1 It is the users responsibility to use safe and propertechniques when handling or using any of the equipmentmentioned.6.2 Good labor
13、atory 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 edition approved July 15,2017.Published August 2017.Originall
14、yapproved in 2009.Last previous edition approved in 2012 as D7506/D7506M-12.DOI:10.1520/D7506_D7506M-17.2For 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 Doc
15、ument 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 principles on standardization established in the Decision on Princ
16、iples for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 7.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 3 specimens.If not,test an agreed upon numberof samples.8.Preparation of Apparatus8.1 Tensile Testing Machine:8.1.1 Prepare the machine according to the manufacturersinstructi
