ASTM_D_6775_-_13.pdf

Designation:D677513Standard Test Method forBreaking Strength and Elongation of Textile Webbing,Tapeand Braided Material1This standard is issued under the fixed designation D6775;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 determination of the break-ing strength and elongation of textile webbing,tape andbraided materials using a split-drum type specimen clamp.1.2 This test method is limited to materials with a maximumwidth of 90 mm(3.5 in.)and a maximum breaking strength ofno more than 89000 N(20000 lb).1.3 The values stated in either SI units or U.S.Customaryunits are to be regarded separately as standard.Within the text,the U.S.Customary units are given in parentheses.The valuesstated in each system are not exact equivalents;therefore,eachsystem shall be used independently of the other.1.4 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 TextilesD1776 Practice for Conditioning and Testing TextilesD4848 Terminology Related to Force,Deformation andRelated Properties of TextilesD4850 Terminology Relating to Fabrics and Fabric TestMethods3.Terminology3.1 For definitions of terms related to force and deformationused in this test method,refer to Terminology D4848.Fordefinitions of other terms related to textiles used in thisstandard,refer to Terminology D123,and D4850.4.Summary of Test Method4.1 A specimen is clamped in a tensile testing machine andextended to rupture.The breaking force is determined from aforce-elongation curve or with an interfaced computer.Elon-gation is determined by calculating the difference betweenbench marks before the application of a force and at a specifiedforce.5.Significance and Use5.1 This test method can be used for acceptance testing ofcommercial shipments but comparisons should be made withcaution because estimates of between-laboratory precision areincomplete.5.1.1 If there are differences of practical significance be-tween reported test results for two laboratories(or more),comparative tests should be performed to determine if there isa statistical bias between them,using competent statisticalassistance.As a minimum,use samples for such comparativetests that are as homogeneous as possible,drawn from the samelot of material as the samples that resulted in disparate resultsduring initial testing,and randomly assigned in equal numbersto each laboratory.The test results from the laboratoriesinvolved should be compared using a statistical test forunpaired data,at a probability level chosen prior to the testingseries.If bias is found,either its cause must be found andcorrected,or future test results for that material must beadjusted in consideration of the known bias.5.2 Elongation is an indication of the ability of a fiber toabsorb energy.The elongation of textile materials must be greatenough to withstand strains experienced in processing and enduse,and to absorb the energies of applied forces repeatedly.6.Apparatus36.1 Tensile Testing Machine,CRE-type,conforming toSpecification D76 with respect to force indication,working1This 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 1,2013.Published August 2013.Originallyapproved in 2002.Last previous edition approved in 2011 as D6775 02(2011).DOI:10.1520/D6775-13.2For 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.3Apparatus and clamps are commercially available.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 FIG.1 Side View of Clamping AssemblyFIG.2 Example of Clamping AssemblyD6775 132 range,capacity and verification of recorded elongation,anddesigned for operation at a pulling speed of 75 6 25 mm/min(3 6 1 in./min).6.2 Clamping Assembly,consisting of an upper and lowerclamp,each a split-drum type,as shown in Fig.1 and Fig.2.6.3 Computer or Microprocessor,interfaced,with automaticdata gathering system,including photo or electronic instru-ments to measure elongation.(Optional.)7.Sampling,Test Specimens,and Test Units7.1 Lot SampleTake a lot sample as directed in theapplicable material specification.In absence of such a specif