1.1 本试验方法包括测定( 1. )使用标称零标距长度的棉纤维作为扁平束的抗拉强度或断裂韧性，或( 2. )棉纤维作为扁平束的抗拉强度或断裂韧性以及断裂负荷下的伸长率 1. / 8. -在中。[3.2-mm]夹具间距。本试验方法适用于未经处理的棉花的松脱皮棉纤维，无论是在加工前获得的还是从纺织产品中获得的。 1.2 本试验方法主要设计用于特殊纤维束夹和特殊强度试验仪器，但当配备合适的适配器以容纳纤维夹时，可用于其他抗拉强度和伸长率试验机。 注1: 测量纤维束断裂韧性的其他方法包括试验方法 D1294号 ，羊毛纤维束断裂强度测试-1标距长度； 2. 和 D5867 ，用大容量仪器测量棉纤维物理性能的试验方法。 1.3 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.4 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。 1.5 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 当实验室水平通过使用相同的参考标准棉样品进行控制时，该试验方法被视为符合验收试验的要求，因为在这些条件下，实验室间精度的当前估计值是可接受的。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，并使用适当的统计协助。 至少应确保使用的测试样品尽可能均匀，从获得不同测试结果的材料中提取，并以相同数量随机分配给每个实验室进行测试。两个实验室的测试应使用未配对数据的统计测试，在测试序列之前选择的概率水平上进行比较。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确定品种、环境和加工对纤维强度和伸长率的影响；在研究这些纤维性能、加工性能和末端质量之间的关系时- 产品 5.3 获得的平束韧性和伸长率值与单纤维测量值高度相关，所需时间和技能更少。 5.4 研究表明，使用不同类型的仪器获得的强度测量值高度相关，但结果处于不同的水平。 3. 5.5 通过使用从已知或既定测试值的标准校准样品上进行的测试中计算出的校正系数，可以将在指定标距长度下使用不同类型仪器获得的结果调整到可比水平。由于棉花的正常变化，无法从不同标距的测试中可靠估计一个标距的强度测试结果。 5.6 拉伸强度和断裂韧性这两个术语有时可以互换使用。 它们是相关的，但不是等价的（参见 12.1.1 和 12.1.2 ). 韧性通常表示为厘牛顿/tex（cN/tex）、克力/旦（gf/den）或磅力/旦（lbf/den）。韧性（单位:厘牛顿/特）在数值上等于韧性（单位:克力/特）乘以0.981。

1.1 This test method covers the determination of ( 1 ) the tensile strength or breaking tenacity of cotton fibers as a flat bundle using a nominal zero gauge length, or ( 2 ) the tensile strength or breaking tenacity and the elongation at the breaking load of cotton fibers as a flat bundle with 1 / 8 -in. [3.2-mm] clamp spacing. This test method is applicable to loose ginned cotton fibers of untreated cottons whether taken before processing or obtained from a textile product. 1.2 This test method is designed primarily for use with special fiber bundle clamps and special strength testing instruments but may be used with other tensile strength and elongation testing machines when equipped with appropriate adapters to accommodate the fiber clamps. Note 1: Other methods for measuring the breaking tenacity of fiber bundles include Test Method D1294 , Test for Breaking Strength of Wool Fiber Bundles—1 in gauge Length; 2 and D5867 , Test Method for Measurement of Physical Properties of Cotton Fibers by High Volume Instruments. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.4 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. 1.5 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 This test method is considered satisfactory for acceptance testing when the levels of the laboratories are controlled by the use of the same reference standard cotton samples because the current estimates of between-laboratory precision are acceptable under these conditions. If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, ensure the test samples to be used are as homogeneous as possible, are drawn from the material from which the disparate test results were obtained, and are randomly assigned in equal numbers to each laboratory for testing. The test from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If a 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 research studies to determine the influence of variety, environment, and processing on fiber strength and elongation; and in studies of the relationships between these fiber properties, processing performance, and quality of end-product. 5.3 Values obtained for flat bundle tenacity and elongation show a high correlation with values measured on single fibers and require much less time and skill. 5.4 Studies have shown that strength measurements obtained with different types of instruments are highly correlated, but the results are on different levels. 3 5.5 By use of correction factors calculated from tests made on standard calibration samples of known or established test values, the results obtained with different types of instruments at a specified gauge length can be adjusted to comparable levels. Due to the normal variation in cottons, strength test results for one gauge length cannot be reliably estimated from tests made at a different gauge length. 5.6 The terms tensile strength and breaking tenacity are sometimes used interchangeably. They are relational but are not equivalent (see 12.1.1 and 12.1.2 ). Tenacity is commonly expressed as centinewtons per tex (cN/tex), grams-force per denier (gf/den) or pounds-force per denier (lbf/den). Tenacity in centinewtons/tex is numerically equal to tenacity in grams-force/tex times 0.981.