1、Designation:D8054/D8054M16Standard Test Methods forTensile Testing of Para-Aramid Flat Yarns1This standard is issued under the fixed designation D8054/D8054M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A
2、 number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover the tensile testing of para-aramid flat yarns.1.1.1 This standard includes procedures used to measureforce at spe
3、cified elongation(FASE)of para-aramid flat yarns.1.1.2 This standard includes procedures used to measurelinear density of para-aramid flat yarns.1.1.3 This standard includes procedures to determine modu-lus of para-aramid flat yarns.1.2 The values stated in either SI units or inch-pound unitsare to
4、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.1.3 This standard does not purport to address all of thesa
5、fety 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 Test
6、ing Machines for TextilesD123 Terminology Relating to TextilesD1776/D1776M Practice for Conditioning and Testing Tex-tilesD1907/D1907M Test Method for Linear Density of Yarn(Yarn Number)by the Skein MethodD2258 Practice for Sampling Yarn for TestingD3800 Test Method for Density of High-Modulus Fiber
7、sD4848 Terminology Related to Force,Deformation andRelated Properties of TextilesD6477 Terminology Relating to Tire Cord,Bead Wire,HoseReinforcing Wire,and FabricsD6587 Test Method for Yarn Number Using AutomaticTesterD7269 Test Methods for Tensile Testing of Aramid YarnsE691 Practice for Conducting
8、 an Interlaboratory Study toDetermine the Precision of a Test MethodE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Terminology3.1 Definitions:3.1.1 flat yarn,ncontinuous filament yarns which,whenremoved from processing package are fully drawn,withouttwist and untextured.3
9、.1.1.1 DiscussionFlat yarn is either extruded in this formor it could be made as a slit cut structure with no additionalprocessing modifying the extension direction of the individualelements(for example,filaments)in the yarn.3.2 The following terms are relevant to this standard:modulus,elongation,fo
10、rce at specified elongation(FASE),force-elongation curve.3.3 For definitions of terms related to industrial fibers andmetallic reinforcements,see Terminology D6477.3.4 For definitions of terms related to force and deformationin textiles,refer to Terminology D4848.3.5 For definitions of other terms r
11、elated to textiles,refer toTerminology D123.4.Summary of Test Methods4.1 Using various test methods and protocols identified inthe procedures,this standard determines the tensile strength,force at specified elonation(FASE),linear density and modulusof para-aramid flat yarns.5.Significance and Use5.1
12、 For application areas such as optical fiber and cablereinforcements,aramid is usually used in a linear not twisted form.For designing constructions like this,it is essential touse data based on a specimen without twist applied.5.1.1 The modulus and FASE of twisted yarns demonstratereduced values wh
13、en compared to p-aramid flat yarns.5.1.2 Use Test Method D7269 for testing of twistedp-aramid yarns.1These test methods are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.19 on IndustrialFibers and Metallic Reinforcements.Current edition
14、 approved July 1,2016.Published November 2016.DOI:10.1520/D8054_D8054M-16.2For 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
15、website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 The levels of tensile properties obtained when testingaramid yarns are dependent on the age and history of thespecimen and on the specific conditions used during the test.Among t
16、hese conditions are rate of stretching,type of clamps,gauge length of specimen,temperature and humidity of theatmosphere,rate of airflow across the specimen,and tempera-ture and moisture content of the specimen.Testing conditionsaccordingly are specified precisely to obtain reproducible testresults on a specific sample.5.3 The FASE is used to describe the absolute resistance ofthe p-aramid flat yarn to an imposed deformation.5.4 The initial modulus of the yarn is the value mostcommonly used when