1.1 本试验方法包括测定断裂力（或载荷）和估算1英寸直径的羊毛纤维束的抗拉强度和韧性。（25.4 mm）标距。包括纤维束的制备程序。 1.2 以英寸-磅为单位的数值应视为标准值。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。由于仪器以英寸-磅单位校准，因此首先显示英寸-磅单位，与委员会D13政策相反。 注1: 有关测量纤维束断裂韧性的其他方法，请参阅测试方法 D1445 和 D2524 . 注2: 本试验方法可用于适合相同制备的其他纤维，但在计算拉伸强度时必须考虑密度差异。 计算断裂韧性时，无需知道或校正纤维密度。 1.3 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。 1.4 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 D1294号 拉伸强度的测定可用于羊毛商业装运的验收测试，但建议谨慎，因为技术人员可能无法在结果之间达成良好一致。按照中的指示进行比较测试 5.1.1 可能是可取的。 5.1.1 如果两个实验室（或更多实验室）的报告测试结果之间存在实际意义上的差异，则应进行比较测试，以确定它们之间是否存在统计偏差，并使用主管的统计协助。作为最低要求，使用尽可能同质的样品进行比较试验，从与初始试验期间产生不同结果的样品相同批次的材料中提取，并随机等份分配给每个实验室。 应使用未配对数据的统计测试对相关实验室的测试结果进行比较，这是在测试系列之前选择的概率水平。如果发现偏差，必须找到并纠正其原因，或者考虑到已知偏差，必须调整该材料的未来测试结果。 5.2 该测试方法有助于研究纤维强度与产品质量之间的关系；应将结果视为比较结果，而不是基本结果，因为由于张力略有差异，发现的强度将低于存在的单个纤维的强度总和。 5.3 也可以获得伸长率，但伸长率测量的准确性有限，因此，其测定不包括在本试验方法的正式部分中。 5.4 本试验方法中使用的程序与试验方法中使用的程序之间的基本差异 D2524 在使用的标距和夹紧方法中。试验方法中 D2524 ，需要特定夹具，而在试验方法中 D1294号 ，可以使用任何传统夹具。通过试验方法确定的断裂载荷结果 D2524 平均30 % 高于通过试验方法获得的值 D1294号 .

1.1 This test method covers the determination of the breaking force (or load) and estimation of the tensile strength and tenacity of wool fiber bundles with a 1-in. (25.4 mm) gage length. A procedure for preparation of the fiber bundle is included. 1.2 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. Because the instrument is calibrated in inch-pound units, inch-pound units are shown first, contrary to Committee D13 policy. Note 1: For other methods of measuring breaking tenacity of fiber bundles, refer to Test Methods D1445 and D2524 . Note 2: This test method can be used for other fibers that lend themselves to the same kind of preparation but the difference in density must be taken into account when calculating the tensile strength. It is not necessary to know or correct for the density of a fiber when calculating breaking tenacity. 1.3 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. 1.4 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 D1294 for the determination of tensile strength may be used for the acceptance testing of commercial shipments of wool, but caution is advised since technicians may fail to get good agreement between results. Comparative tests as directed in 5.1.1 may be advisable. 5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative test should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use the samples for such a comparative test that are as homogenous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, a probability level chosen prior to the testing series. If bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias. 5.2 This test method is useful in studying the relationship between fiber strength and product quality; results should be considered comparative rather than fundamental since the strength found will be lower than the sum of the strengths of the individual fibers present due to slight differences in tensioning. 5.3 Elongation may be obtained also but the accuracy of elongation measurements is limited and their determination is, therefore, not included as a formal part of this test method. 5.4 The basic differences between the procedures employed in this test method and those of Test Method D2524 are in the gage lengths employed and the methods of clamping. In Test Method D2524 , specific clamps are required whereas in Test Method D1294 , any conventional clamps may be used. Results for breaking load determined by Test Method D2524 average 30 % higher than those obtained by Test Method D1294 .