1.1 这些试验方法包括测量从卷曲或未卷曲的长丝、短纤维或丝束纤维中提取的人造纺织纤维的断裂韧性，并在双环或形成单个上卷结的股线中进行试验。 1.2 包括环和结形式的经处理和湿（浸入）纤维断裂韧性的测量方法。 1.3 环或结试验中的伸长率没有已知意义，通常不会记录。 1.4 这些试验方法中描述的程序与试验方法中包含的程序之间的基本区别 D2101 是样本的配置，即作为双环或单个上手结的配置。 1.5 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不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.6 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。 1.7 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 根据在本文规定的条件下测量的断裂力和纤维的线密度计算出的环断裂强度和结断裂强度都是用于确定纤维限制的基本特性- 处理和最终使用应用程序。断裂力和伸长率测试未明确定义的物理特性，如脆性，可根据在环或结测试中或两者中测量的断裂韧性与通过测试方法测量的正常韧性的比率进行估计 D3822 假设两种方法使用相同的标距和应变率。 5.2 在缺乏实验室间精度的可靠信息的情况下，不建议将本测试方法用于商业装运的验收测试（见 附注3 ). 在某些情况下，买方和供应商可能必须采用最佳可用方法测试一种或多种特定材料的商业装运，即使该方法未被推荐用于商业装运的验收测试。 在这种情况下，如果在使用本测试方法进行验收测试时，由于买方和供应商报告的值的差异而产生分歧，统计偏差（如有），买方实验室和供应商实验室之间的比较应根据从被评估材料的一个样品中随机抽取的试样进行确定。

1.1 These test methods cover the measurement of the breaking tenacity of manufactured textile fibers taken from filament yarns, staple, or tow fiber, either crimped or uncrimped, and tested in either a double loop or as a strand formed into a single overhand knot. 1.2 Methods for measuring the breaking tenacity of conditioned and wet (immersed) fibers in loop and knot form are included. 1.3 Elongation in loop or knot tests has no known significance, and is usually not recorded. 1.4 The basic distinction between the procedures described in these test methods and those included in Test Methods D2101 is the configuration of the specimen, that is, either as a double loop or in the configuration of a single overhand knot. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.6 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. 1.7 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 Both the loop breaking tenacity and the knot breaking tenacity, calculated from the breaking force measured under the conditions specified herein and the linear density of the fiber, are fundamental properties that are used to establish limitations on fiber-processing and upon their end-use applications. Physical properties, such as brittleness, not well defined by tests for breaking force and elongation can be estimated from the ratio of breaking tenacity measured in loop or knot tests, or both, and the normal tenacity as measured by Test Method D3822 provided both methods use the same gauge length and strain rate. 5.2 This test method is not recommended for acceptance testing of commercial shipments in the absence of reliable information on between-laboratory precision (see Note 3 ). In some cases the purchaser and the supplier may have to test a commercial shipment of one or more specific materials by the best available method, even though the method has not been recommended for acceptance testing of commercial shipments. In such a case, if there is a disagreement arising from differences in values reported by the purchaser and the supplier when using this test method for acceptance testing, the statistical bias, if any, between the laboratory of the purchaser and the laboratory of the supplier should be determined with each comparison being based on testing specimens randomly drawn from one sample of material of the type being evaluated.