ASTM_D_2256_-_D_2256M_-_21.pdf

Designation:D2256/D2256M21Standard Test Method forTensile Properties of Yarns by the Single-Strand Method1This standard is issued under the fixed designation D2256/D2256M;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 indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of tensileproperties of monofilament,multifilament,and spun yarns,either single,plied,or cabled with the exception of yarns thatstretch more than 5.0%when tension is increased from 0.05 to1.0 cN/tex 0.5 to 1.0 gf/tex.1.2 This test method covers the measurement of breakingforce and elongation of yarns and includes directions for thecalculation of breaking tenacity,initial modulus,chordmodulus,and breaking toughness.1.2.1 Options are included for the testing of specimens in:(A)straight,(B)knotted,and(C)looped form.1.2.2 Conditions of test are included for the testing ofspecimens that are:(1)conditioned air,(2)wet,not immersed,(3)wet,immersed,(4)oven-dried,(5)exposed to elevatedtemperature,or(6)exposed to low temperature.NOTE1Special methods for testing yarns made from specific fibers;namely,glass,flax,hemp,ramie,and kraft paper and for specific products;namely,tire cords and rope,have been published:Test Methods D885,andSpecification D578.NOTE2For directions covering the determination of breaking force ofyarn by the skein method refer to Test Method D1578.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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 Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D76/D76M Specification for Tensile Testing Machines forTextilesD123 Terminology Relating to TextilesD578 Specification for Glass Fiber StrandsD885 Test Methods for Tire Cords,Tire Cord Fabrics,andIndustrial Filament Yarns Made from ManufacturedOrganic-Base FibersD1578 Test Method for Breaking Strength of Yarn in SkeinFormD1776 Practice for Conditioning and Testing TextilesD2258 Practice for Sampling Yarn for TestingD2904 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)3D4848 Terminology Related to Force,Deformation andRelated Properties of TextilesD4849 Terminology Related to Yarns and FibersE178 Practice for Dealing With Outlying Observations3.Terminology3.1 Definitions:3.1.1 Refer to Terminology D4848 for definitions of thefollowing terms used in this standard:breaking force,breakingstrength,breaking tenacity,breaking toughness,chordmodulus,elongation,elongation at break,elongation at rupture,initial modulus,knot-breaking force,knot breaking strength,linear density,loop breaking force,loop-breaking strength,single-strand breaking force,single-strand breaking strength,strength and tenacity.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1,2021.Published August 2021.Originallyapproved in 1964.Last previous edition approved in 2015 as D2256 10(2015).DOI:10.1520/D2256_D2256M-21.2For 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 StatesThis international standard was developed in accordance with internationally recognized principles 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.13.1.2 Refer to Terminology D123 and Term