1.1 这些测试方法涵盖了对位芳纶扁平纱线的拉伸测试。这些方法仅包括测试程序，不包括规范或公差。 1.2 本标准包括以下试验方法: 部分 线性密度 10 规定伸长率下的力（FASE） 11 模量 11 1.3 以国际单位制或英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效值；因此，为了确保符合标准，每个系统应独立使用，两个系统的值不得组合。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、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 对于光纤和电缆加固等应用领域，芳族聚酰胺通常以线性而非扭曲的形式使用。对于此类结构的设计，必须使用基于未施加扭曲的试样的数据。 5.1.1 加捻纱的模量和FASE与对芳族聚酰胺扁纱相比显示出降低的值。 5.1.2 使用测试方法 D7269型 用于测试加捻的p-芳纶纱线。 5.2 测试芳纶纱线时获得的拉伸性能水平取决于样品的年龄和历史以及测试期间使用的特定条件。 这些条件包括拉伸速率、夹具类型、试样标距长度、大气温度和湿度、穿过试样的气流速率以及试样的温度和水分含量。因此，精确规定了测试条件，以在特定样品上获得可重复的测试结果。 5.3 FASE（规定伸长率下的力）描述了对芳族聚酰胺扁纱对强加伸长率的绝对阻力。 5.4 模量是纱线或帘线在施加力时对拉伸阻力的度量。它有助于估计织物增强结构对施加不同的力和拉伸速率的响应。尽管模量可以在任何指定的力下确定，但初始模量是最常用的值。 5.5 最终产品的形状、尺寸和内部结构会对产品性能产生显著影响。因此，不可能仅根据增强材料来评估最终产品的性能。 5.6 如果两个实验室（或多个实验室）报告的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，并使用合格的统计协助。作为最低要求，应使用尽可能均匀的测试样品，从获得不同测试结果的材料中提取样品，并以相同数量随机分配给每个实验室进行测试。可使用具有既定试验值的其他材料。 两个实验室的测试结果应使用未配对数据的统计测试进行比较，在测试系列之前选择的概率水平。如果发现偏差，则必须找到并纠正其原因，或者必须根据已知偏差调整未来的测试结果。

1.1 These test methods cover the tensile testing of para-aramid flat yarns. The methods include testing procedure only and include no specifications or tolerances. 1.2 This standard includes the following test methods: Section Linear Density 10 Force at Specified Elongation (FASE) 11 Modulus 11 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 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. 1.4 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 For application areas such as optical fiber and cable reinforcements, aramid is usually used in a linear – not twisted – form. For designing constructions like this, it is essential to use data based on a specimen without twist applied. 5.1.1 The modulus and FASE of twisted yarns demonstrate reduced values when compared to p-aramid flat yarns. 5.1.2 Use Test Method D7269 for testing of twisted p-aramid yarns. 5.2 The levels of tensile properties obtained when testing aramid yarns are dependent on the age and history of the specimen and on the specific conditions used during the test. Among these conditions are rate of stretching, type of clamps, gauge length of specimen, temperature and humidity of the atmosphere, rate of airflow across the specimen, and temperature and moisture content of the specimen. Testing conditions accordingly are specified precisely to obtain reproducible test results on a specific sample. 5.3 FASE (Force At Specified Elongation) describes the absolute resistance of the p-aramid flat yarn to an imposed elongation. 5.4 Modulus is a measure of resistance of yarn or cord to extension as a force is applied. It is useful for estimating the response of a textile reinforced structure to the application of varying forces and rates of stretching. Although modulus may be determined at any specified force, initial modulus is the value most commonly used. 5.5 Shape, size, and internal construction of the end-product can have appreciable effect on product performance. It is not possible, therefore, to evaluate the performance of end product in terms of the reinforcing material alone. 5.6 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, test samples should be used that are as homogeneous as possible, that are drawn from the material from which the disparate test results were obtained, and that are randomly assigned in equal numbers to each laboratory for testing. Other materials with established test values may be used for this purpose. The test results 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 must be adjusted in consideration of the known bias.