1.1 本试验方法包括测定羊毛纤维作为平束的断裂韧性 1. / 8. 在里面（3.2 mm）夹具分离。 1.2 本试验方法特别适用于规定的纤维束夹具和强度测试仪器，但当配备合适的适配器以适应规定的夹具时，可在其他拉伸试验机上使用。 1.3 本试验方法适用于任何形式的羊毛，这些羊毛可以手工梳理成平行纤维的小束。 注1: 测量纤维束断裂韧性的其他试验方法包括试验方法 D1294号 , D1445 和 D540 . 1.4 以英寸表示的值- 磅单位应视为标准单位。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 试验方法 D2524 当使用参考羊毛的参与实验室证明实验室间精度可以接受时，对于测试羊毛纤维的韧性而言，验收测试是令人满意的。建议在任何验收测试计划之前，在买方实验室和卖方实验室对待评估材料的复制样品进行实验室间检查。在有争议的情况下，买方和卖方实验室之间的统计偏差（如有）应根据所评估类型材料的一个样本中的随机样本进行测试进行确定。 5.2 从平束韧性获得的值与从单纤维测试获得的值具有良好的相关性，所需时间更少。 5.3 试验方法中描述的程序之间的基本差异 D2524 以及试验方法中描述的 D1294号 以夹紧束的方式放置，并使用较短的标距。这种方法中使用的特殊夹具可以更快、更容易地准备束；然而，对于试验方法 D1294号 不需要特殊夹具。通过测试方法，也获得了与单纤维强度更接近的一致性 D2524 使用试验方法中的程序时 D1294号 . 5.4 由于观察到的纤维韧性部分取决于所用拉伸试验机的类型和断裂试样所需的时间，因此使用该方法中可能使用的不同类型的机器获得的结果不一定一致。 专门设计用于捆绑测试的机器是CRL测试仪，其加载速率为1 kgf/s，因此在可变时间达到5 s左右的破断力。CRE和CRT型机器预计会产生一些不同的结果，这不仅是因为操作中的固有差异，而且是因为CRE和CRT型机器的操作速率为在20秒内达到破断负荷。

1.1 This test method covers the determination of the breaking tenacity of wool fibers as a flat bundle with a 1 / 8 in. (3.2 mm) clamp separation. 1.2 This test method is especially adapted to the fiber bundle clamps and strength testing instruments specified, but may be used on other tensile testing machines when equipped with appropriate adapters to accommodate the prescribed clamps. 1.3 This test method is applicable to wool in any form which can be hand-combed into small bundles of parallelized fibers. Note 1: Other test methods for measuring breaking tenacity of fiber bundles include Test Methods D1294 , D1445 , and D540 . 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Test Method D2524 for testing wool fibers for tenacity is considered satisfactory for acceptance testing when the participating laboratories, using a reference wool, have shown acceptable between-laboratory precision. It is recommended that any program of acceptance testing be preceded by an interlaboratory check in the laboratory of the purchaser and the laboratory of the seller on replicate specimens of samples of the material to be evaluated. In cases of dispute, the statistical bias, if any, between the laboratory of the purchaser and the seller should be determined with each comparison being based on testing randomized specimens from one sample of material of the type being evaluated. 5.2 Values obtained from flat bundle tenacity show a good correlation with values obtained from single fiber tests and require much less time. 5.3 The basic differences between the procedures described in Test Method D2524 and those described in Test Method D1294 lie in the manner of clamping the bundles and the shorter gage length employed. The special clamps used in this method allow quicker and easier bundle preparation; however, for Test Method D1294 no special clamps are required. Closer agreement with single fiber tenacity is also obtained with Test Method D2524 than when using the procedure in Test Method D1294 . 5.4 As the observed tenacity of fibers depends in part on the type of tensile testing machine used and the time required to break the specimen, results obtained with the different types of machines which may be used in this method will not necessarily agree. The machines specifically designed for bundle testing are CRL testers which operate at a loading rate of 1 kgf/s and therefore reach the breaking force at variable times in the order of 5 s. CRE and CRT type machines would be expected to produce somewhat different results not only because of the inherent difference in operation but because CRE and CRT type machines are to be operated at a rate to achieve the breaking load in 20 s.