ASTM F1752-1996(2006) Standard Test Method for Archery Bow Component-Cord Material《射箭弓弦用材料标准试验方法》.pdf

1、Designation: F 1752 96 (Reapproved 2006)An American National StandardStandard Test Method forArchery Bow ComponentCord Material1This standard is issued under the fixed designation F 1752; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis

2、ion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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

3、 the 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, i

4、f 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:2D 76 Specification for Tensile Testing Machine

5、s for TextilesD 123 Terminology Relating to TextilesD 204 Test Methods for Sewing ThreadsD 1776 Practice for Conditioning and Testing TextilesD 1907 Test Method for Linear Density of Yarn (YarnNumber) by the Skein MethodD 2256 Test Method for Tensile Properties of Yarns by theSingle-Strand Method3.

6、Terminology3.1 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 text

7、ile materials. 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 t

8、hickness 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 b

9、etween 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

10、the pre-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 Thi

11、s test 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 ci

12、rcum-stances 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 D 1776 for stan-dard condition requirements:70 6 2F 21 6 1C!,656 2 % relative humidity. (1)5.2 Denier, Tex

13、Refer to Test Method D 1907, Option 1:1This test method is under the jurisdiction of ASTM Committee F08 on SportsEquipment and Facilities and is the direct responsibility of Subcommittee F08.16 onArchery Products.Current edition approved May 1, 2006. Published May 2006. Originallyapproved in 1996. L

14、ast previous edition approved in 2001 as F 1752 96 (2001).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.1Co

15、pyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2.1 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.5.2.2 CalculationReport test results

16、as one test specimen/sample and average of three samples:C 3 W!/L 51! 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 D 204:0.375 6 0.001 in. (9.52 6 0.02 mm) anvil, wei

17、ghted to apply6 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 1200 mm in length. Toeach test specim

18、en 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 additionto 1-lb (4.448-N) prestress

19、 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 as “L4 48-h Stretch.”5.4.5 Remove s

20、pecified 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 two testspecimens/sample, average

21、of three samples, and specifiedweight used.5.4.6.1 Initial Stretch:L2 2 L1!/L1 3 100 5 % Initial Stretch (3)5.4.6.2 24-h Stretch:L3 2 L1!/L1 3 100 5 %242h Stretch (4)5.4.6.3 48-h Stretch:L4 2 L1!/L1 3 100 5 %482h Stretch (5)5.4.6.4 Stretch/Relaxation:L5 2 L1!/L1 3 100 5 % Stretch Relaxation (6)5.5 S

22、trength, ElongationFollow Test Method D 2256.5.5.1 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 point to tangentpoint) for capst

23、an 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.5.5.2 Elongation tests using ca

24、pstan 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 theindex marks after applying a load

25、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 are being determined.6.2 BiasSi

26、nce 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; stretchASTM International takes no position respecting the validity of any patent rights asserted i

27、n connection with any item mentionedin this standard. Users 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 r

28、esponsible technical committee and must be reviewed every 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 car

29、eful consideration at a meeting of theresponsible technical 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 Internation

30、al, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, 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).TABLE 1 Cord Material Strength RequirementsCord Material Strength, lbA1539 4064 6589 90114 115139 140164 165189Specified weight, lb 5 10 15 20 25 30 35AMultiply by 4.448 for conversion to newtons.F 1752 96 (2006)2