ASTM_D_5587_-_15.pdf

Designation:D558715Standard Test Method forTearing Strength of Fabrics by Trapezoid Procedure1This standard is issued under the fixed designation D5587;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 measurement of the tearingstrength of textile fabrics by the trapezoid procedure using arecording constant-rate-of-extension-type(CRE)tensile testingmachine.1.1.1 The CRE-type tensile testing machine has become thepreferred test apparatus for determining trapezoid tearingstrength.It is recognized that some constant-rate-of-traverse-type(CRT)tensile testing machines continue to be used.Consequently,these test instruments may be used when agreedupon between the purchaser and the supplier.The conditionsfor use of the CRT-type tensile tester are included in AppendixX1.1.2 This test method applies to most fabrics includingwoven fabrics,air bag fabrics,blankets,napped fabrics,knittedfabrics,layered fabrics,pile,and nonwoven fabrics.Thefabrics may be untreated,heavily sized,coated,resin-treated,or otherwise treated.Instructions are provided for testingspecimens with or without wetting.1.3 Tearing strength,as measured in this test method,requires that the tear be initiated before testing.The reportedvalue obtained is not directly related to the force required toinitiate or start a tear.1.4 Two calculations for trapezoid tearing strength areprovided:the single-peak force and the average of five highestpeak forces.1.5 The values stated in SI units are to be regarded as thestandard.The values stated in inch-pound units may beapproximate.1.6 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:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD629 Test Methods for Quantitative Analysis of TextilesD1776 Practice for Conditioning and Testing TextilesD2904 Practice for Interlaboratory Testing of a Textile TestMethod that Produces Normally Distributed Data(With-drawn 2008)3D2906 Practice for Statements on Precision and Bias forTextiles(Withdrawn 2008)3D4850 Terminology Relating to Fabrics and Fabric TestMethods3.Terminology3.1 For all terminology relating to D13.59,Fabric Testmethods,General,refer to Terminology D4850.3.1.1 The following terms are relevant to this standard:fabric,in textiles;peak force,in tear testing of fabrics;tearingforce,in fabric;tearing strength,in fabrics;yarn distortion(seeFig.1).3.2 For all other terms related to textiles,refer to Terminol-ogy D123.4.Summary of Test Method4.1 An outline of an isosceles trapezoid is marked on arectangular specimen(see Fig.2).The specimen is slit at thecenter of the smallest base of the trapezoid to start the tear.Thenonparallel sides of the marked trapezoid are clamped inparallel clamps of a tensile testing machine.The separation ofthe clamps is increased continuously to apply a force topropagate the tear across the specimen.At the same time,theforce developed is recorded.The force to continue the tear iscalculated from autographic chart recorders or microprocessordata collection systems.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods,Specific.Current edition approved July 1,2015.Published September 2015.Originallyapproved in 1996.Last previous edition approved in 2014 as D5587 14.DOI:10.1520/D5587-15.2For 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.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 5.Significance and Use5.1 This test method is considered satisfactory for accep-tance testing of commercial shipments because current esti-mates of between-laboratory precision are acceptable,and thistest method is used extensively in the trade for acceptancetesting.5.2 If there are differences of practical significance betweentest results for two laboratories(or more),comparative testshould be performed to determine if there is a statistical biasbetween them,using competent statistical assistance.As aminimum,use the samples for such a comparative test that areas homogeneous as possible,drawn from the same lot ofmaterial as the samples that resulted in disparate