ASTM D2524-2013 Standard Test Method for Breaking Tenacity of Wool Fibers Flat Bundle Method 18-in (3 2-mm) Gage Length《毛纤维抗断裂强度的标准试验方法 平列纤维束法 1 8 in(3 2 mm)标距长度》.pdf
《ASTM D2524-2013 Standard Test Method for Breaking Tenacity of Wool Fibers Flat Bundle Method 18-in (3 2-mm) Gage Length《毛纤维抗断裂强度的标准试验方法 平列纤维束法 1 8 in(3 2 mm)标距长度》.pdf》由会员分享,可在线阅读,更多相关《ASTM D2524-2013 Standard Test Method for Breaking Tenacity of Wool Fibers Flat Bundle Method 18-in (3 2-mm) Gage Length《毛纤维抗断裂强度的标准试验方法 平列纤维束法 1 8 in(3 2 mm)标距长度》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D2524 13Standard Test Method forBreaking Tenacity of Wool Fibers, Flat Bundle Method18-in. (3.2-mm) Gage Length1This standard is issued under the fixed designation D2524; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 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 tenacity of wool fibers as a flat bundle with
3、a18-in.(3.2-mm) clamp separation.1.2 This test method is especially adapted to the fiber bundleclamps and strength testing instruments specified, but may beused on other tensile testing machines when equipped withappropriate adapters to accommodate the prescribed clamps.1.3 This test method is appli
4、cable to wool in any formwhich can be hand-combed into small bundles of parallelizedfibers.NOTE 1Other test methods for measuring breaking tenacity of fiberbundles include Test Methods D1294, D1445, and D540.1.4 The values stated in inch-pound units are to be regardedas standard. The values given in
5、 parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 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
6、-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD540 Methods of Testing Man-Made Staple Fibers; Re-placed by D 3660 (Withdrawn 1973)3D1294 Test Method for Tensi
7、le Strength and Breaking Te-nacity of Wool Fiber Bundles 1-in. (25.4-mm) GageLengthD1445 Test Method for Breaking Strength and Elongation ofCotton Fibers (Flat Bundle Method)D1776 Practice for Conditioning and Testing TextilesD4845 Terminology Relating to WoolD2525 Practice for Sampling Wool for Moi
8、sture3. Terminology3.1 For all terminology related to D13.13, Wool and Felt,see Terminology D4845.3.1.1 The following terms are relevant to this standard:breaking tenacity, constant-rate-of-extension (CRE) type ten-sile testing machine, constant-rate-of-loading (CRL) type ten-sile testing machine, c
9、onstant-rate-of-traverse (CRT) type ten-sile testing machine, gage length, tenacity, wool.3.2 For definitions of all other textile terms see TerminologyD123.4. Summary of Test Method4.1 A bundle of fibers is combed until parallel, placed undera uniform tension sufficient to remove as much crimp aspo
10、ssible without stretching the fibers, and secured in specialclamps. The fibers are then cut to a known length, broken in thetensile testing machine, removed from the clamps, andweighed. Breaking tenacity is calculated from the ratio ofbreaking force to bundle linear density. The length measuredunder
11、 the applied tension is the basis for computing lineardensity from bundle mass.5. Significance and Uses5.1 Test Method D2524 for testing wool fibers for tenacityis considered satisfactory for acceptance testing when theparticipating laboratories, using a reference wool, have shownacceptable between-
12、laboratory precision. It is recommendedthat any program of acceptance testing be preceded by aninterlaboratory check in the laboratory of the purchaser and thelaboratory of the seller on replicate specimens of samples ofthe material to be evaluated. In cases of dispute, the statisticalbias, if any,
13、between the laboratory of the purchaser and theseller should be determined with each comparison being basedon testing randomized specimens from one sample of materialof the type being evaluated.1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibil
14、ity of Subcommittee D13.13 on Wool and Felt.Current edition approved July 1, 2013. Published August 2013. Originallyapproved in 1966. Last previous edition approved in 2008 as D2524 95 (2008).DOI: 10.1520/D2524-13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM C
15、ustomer 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 C70
16、0, West Conshohocken, PA 19428-2959. United States15.2 Values obtained from flat bundle tenacity show a goodcorrelation with values obtained from single fiber tests andrequire much less time.5.3 The basic differences between the procedures describedin Test Method D2524 and those described in Test Me
17、thodD1294 lie in the manner of clamping the bundles and theshorter gage length employed. The special clamps used in thismethod allow quicker and easier bundle preparation; however,for Test Method D1294 no special clamps are required. Closeragreement with single fiber tenacity is also obtained with T
18、estMethod D2524 than when using the procedure in Test MethodD1294.5.4 As the observed tenacity of fibers depends in part on thetype of tensile testing machine used and the time required tobreak the specimen, results obtained with the different types ofmachines which may be used in this method will n
19、ot neces-sarily agree. The machines specifically designed for bundletesting are CRL testers which operate at a loading rate of 1kgf/s and therefore reach the breaking force at variable times inthe order of 5 s. CRE and CRT type machines would beexpected to produce somewhat different results not only
20、because of the inherent difference in operation but becauseCRE and CRT type machines are to be operated at a rate toachieve the breaking load in 20 s.6. Apparatus and Materials6.1 Tensile Testing Machine, having a capacity of at least 7kgf (70 N), equipped to accommodate the specified flat bundlecla
21、mps. For CRL testing machines,4the rate of loading isspecified as 1 kgf/s (10 N/s). For CRE and CRT machines,select a rate of operation which will reach the breaking force inan average time of 20 6 3s.6.1.1 In case the CRE or CRT testing machine is not capableof operating as specified in 6.1, select
22、 a rate so as to reach thebreaking force in an average time as close to 20 s as possibleand report the average time to break.NOTE 2There may be no overall correlation between the resultsobtained with the CRE, CRT or CRL type testing machines. Consequently,these three machines cannot be used intercha
23、ngeably.6.2 Balance, suitable for weighing 2 to 6 mg with asensitivity of 0.02 mg.6.3 Flat Bundle Clamps and Accessories, including thefollowing components:NOTE 3Pressley clamps and accessories have been found satisfactoryfor this purpose.5Adapters to fit the clamps to various tensile testinginstrum
24、ents are also available or can be fabricated.6.3.1 Clamps, having a total thickness of 0.465 6 0.001 in.(11.8 6 0.03 mm) and a 0.125 6 0.001-in. (3.2 6 0.03-mm)spacer.6.3.2 Clamp Vise, with a device to indicate approximately 8lbfin. (0.9 Nm) torque.6.3.3 Clamp Wrench.6.4 Coarse Comb, approximately 8
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD25242013STANDARDTESTMETHODFORBREAKINGTENACITYOFWOOLFIBERSFLATBUNDLEMETHOD18IN32MMGAGELENGTH 纤维 断裂强度
链接地址:http://www.mydoc123.com/p-513040.html