ASTM F1752-1996(2014) Standard Test Method for Archery Bow ComponentCord Material《射箭弓弦材料的标准试验方法》.pdf

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1、Designation: F1752 96 (Reapproved 2014) An American National StandardStandard Test Method forArchery Bow ComponentCord Material1This standard is issued under the fixed designation F1752; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi

2、on, 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 establishes the classification and test-ing of cord as a component material used in t

3、he fashioning ofbowstrings.1.2 This test method is not intended to provide informationbeyond any evaluation of the cord material that would deter-mine its fitness for use other than in the fabrication ofcompleted bowstrings.1.3 This standard does not purport to address all of thesafety concerns, if

4、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 f

5、or TextilesD123 Terminology Relating to TextilesD204 Test Methods for Sewing ThreadsD1776 Practice for Conditioning and Testing TextilesD1907 Test Method for Linear Density of Yarn (Yarn Num-ber) by the Skein MethodD2256 Test Method for Tensile Properties of Yarns by theSingle-Strand Method3. Termin

6、ology3.1 bowstring, ncompleted assembly constructed in partfrom multiple strands of cord material lashed at the center andloop ends with serving string materials and used to connect thelimbs of a bow by which to launch an arrow.3.2 cord material, napplied to a variety of natural ormanmade textile ma

7、terials. Cord material may be of monocord,twisted, cable, or braided construction.3.3 denier, tex, ndirect yarn numbering systems express-ing size of cord material in terms of mass (weight) of unitlength per 9000 m (9842 yd) for denier or 1000 m (1094 yd) fortex.3.4 diameter, nmeasure of the thickne

8、ss of the cordmaterial.3.5 EASL, nelongation at a set load.3.6 elongation, namount that a cord material stretchesmeasured as a percentage of the original length either at thepoint of rupture or at some other interval of applied load.3.7 free gage length, nlength of unsupported test speci-men between

9、 holding clamps and free from contact with anysnubbing or other sources that could result in nonuniform gagelength measurement.3.8 static load stretch/relaxation, nmeasure of the amounta cord material moves while under static load and with loadsubsequently removed, measured as a percentage of the pr

10、e-stressed original length.3.9 standard condition, ncondition reached by cord ma-terial when in moisture equilibrium with a standard atmosphereof a given temperature and relative humidity.3.10 strength, nmaximum force applied to a cord materialcausing it to break.4. Significance and Use4.1 This test

11、 method is intended to provide the user of cordmaterials for bowstrings the basic information for evaluationand procurement.4.2 This test method is not meant to be all inclusive sincespecial circumstances may occur that will dictate the use ofnonconforming procedures for evaluation. Special circum-s

12、tances and the requirements they establish cannot be antici-pated totally and, therefore, must be considered on an indi-vidual basis.5. Test Methods5.1 Standard ConditionRefer to Practice D1776 for stan-dard condition requirements:7062F 2161C!,6562 % relative humidity. (1)5.2 Denier, TexRefer to Tes

13、t Method D1907, Option 1:1This test method is under the jurisdiction of ASTM Committee F08 on SportsEquipment, Playing Surfaces, and Facilities and is the direct responsibility ofSubcommittee F08.16 on Archery Products.Current edition approved Sept. 1, 2014. Published November 2014. Originallyapprov

14、ed in 1996. Last previous edition approved in 2010 as F1752 96 (2010).DOI: 10.1520/F1752-96R14.2For 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 Documen

15、t Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2.1 Wind 12yd reeling using 1.5yd perimeter reel. Donot tie reeling ends; rather, cut at overlap of stated yardage.Weigh reeling to the nearest 1 mg.5

16、.2.2 CalculationReport test results as one test specimen/sample and average of three samples:C 3W!/L 5 1! Denier or 2! Tex (2)where:C = (1) 9842 (denier constant) or (2) 1094 (tex constant),W = weight of reeled yardage, g,L = length of reeled yardage.5.3 DiameterRefer to Test Methods D204: 0.375 6 0

17、.001in. (9.52 6 0.02 mm) anvil, weighted to apply 6 6 ozf(1.67 6 0.03 N)5.3.1 Report test results as average of five test specimenssample and average of three samples.5.4 Static Load Stretch/Relaxation:5.4.1 From a lot, select three samples. From each sample,take two test specimens, approximately 12

18、00 mm in length. Toeach test specimen hang 1-lb (4.448-N) prestress hook weightfor 15 min. Mark off index marks 800 mm apart on each testspecimen with a marker. Record as “L1 Original Length.”5.4.2 After marking the prestressed test specimen, addspecified weight (see Table 1) to each hook weight in

19、additionto 1-lb (4.448-N) prestress weight. Measure index markdistance to nearest 1 mm and record as “L2 Original Stretch.”5.4.3 After 24 h, measure the index mark distance to nearest1 mm and record as “L3 24-h Stretch.”5.4.4 After 48 h, measure the index mark distance to thenearest 1 mm and record

20、as “L4 48-h Stretch.”5.4.5 Remove specified weight from hook weight leaving1-lb (4.448-N) original prestress weight for 15 min. Measureindex mark distance after 15 min to nearest 1 mm and recordas “L5 Permanent Stretch/Relaxation.” Report as Stretch orRelaxation.5.4.6 CalculationReport as average of

21、 two testspecimens/sample, average of three samples, and specifiedweight used.5.4.6.1 Initial Stretch:L2 2 L1!/L1 3100 5 % Initial Stretch (3)5.4.6.2 24-h Stretch:L3 2 L1!/L1 3100 5 %242 h Stretch (4)5.4.6.3 48-h Stretch:L4 2 L1!/L1 3100 5 %482 h Stretch (5)5.4.6.4 Stretch/Relaxation:L5 2 L1!/L1 310

22、0 5 % Stretch Relaxation (6)5.5 Strength, ElongationFollow Test Method D2256.5.5.1 CRE-type testing machine set at 12 6 0.5 in. (305 610 mm)/min with a gage length of (1) 10 6 0.1 in. (250 6 3mm) from nip to nip for pneumatic flat faced jaws, or (2) 5 60.1-in. (125 6 3-mm) free gage length (tangent

23、point to tangentpoint) for capstan clamps. If the specimen breaks within18 in.(3.0 mm) of either pneumatic jaws or capstan clamp tangentpoints, disregard the result and test another specimen from thesame sample. Report test results as average of five testspecimens/sample and average of three samples

24、.5.5.2 Elongation tests using capstan clamps are measured at80 % of test specimen average breaking load using 100-mmindex marks arbitrarily marked along the free gage length dueto possible stretching of the test specimen length around thesurface of the capstans. Measure the change in length of thein

25、dex marks after applying a load to test specimen equal to80 % of sample average breaking strength. Report test resultsentitled EASL 80 % as the average of five test specimens/sample and the average of three samples.6. Precision and Bias6.1 PrecisionThe precision for the procedures in this testmethod

26、 are being determined.6.2 BiasSince there is no accepted reference material fordetermining the bias for the procedures used in this testmethod, no statement is being made.7. Keywords7.1 bowstring; cord material; denier; gage length; stretchTABLE 1 Cord Material Strength RequirementsCord Material Str

27、ength, lbA1539 4064 6589 90114 115139 140164 165189Specified weight, lb 5 10 15 20 25 30 35AMultiply by 4.448 for conversion to newtons.F1752 96 (2014)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Us

28、ers of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed ever

29、y five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible techni

30、cal committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocke

31、n, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 96 (2014)3