1.1 本试验方法涵盖了测定大多数纺织面料断裂强度和伸长率的抓取和改良抓取试验程序。规定了湿试验。 1.1.1 抓取试验程序适用于机织物、非织造布和毡织物，而改进的抓取试验程序主要用于机织物。 1.2 本试验方法不推荐用于玻璃织物，或针织物和其他具有高弹性（大于11 %). 注1: 关于使用缠绕条测试程序和切割条测试程序测定织物的断裂力和伸长率，请参阅测试方法 D5035 . 1.3 本试验方法提供了英寸-磅单位和国际单位制的数值。英寸磅单位是美国常用单位的技术正确名称。国际单位制（SI units）是公制单位（即国际单位制）在技术上的正确名称。以可接受的公制单位或其他单位表示的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，每个系统必须相互独立使用，不得以任何方式组合。 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 本试验方法中用于测定断裂力和伸长率的抓取试验程序适用于大多数机织物或非织造织物的商业装运验收试验，修改后的抓取试验程序适用于大多数机织物的商业装运验收试验，因为该程序已在验收测试行业中广泛使用。 5.1.1 如果在使用本测试方法进行商业装运验收测试时，由于报告测试值的差异而产生分歧，买方和供应商应进行比较测试，以确定其实验室之间是否存在统计偏差。建议为调查偏差提供称职的统计协助。作为最低要求，双方应尽可能均匀地从大量相关类型的材料中选取一组试样。然后，应将试样以相同数量随机分配给每个实验室进行测试。 两个实验室的平均结果应使用学生的 t -测试未配对数据和双方在测试开始前选择的可接受概率水平。如果发现偏差，必须找到并纠正其原因，或者买方和供应商必须同意根据已知偏差解释未来的测试结果。 5.2 由于针织物具有较高的弹性，因此不建议使用本试验方法。 5.3 对于强度超过200牛顿/厘米（1140磅/英寸）的任何织物，可能需要对技术进行一些修改宽度必要时，提供特殊的预防措施，以用于坚固的织物。 5.4 所有程序均适用于测试经过处理或潮湿的织物。 5.5 不建议比较在不同原理下运行的拉伸试验机的结果。当使用不同类型的机器进行比较测试时，以20±3秒的恒定断裂时间是生成数据的既定方法。即使如此，数据也可能存在显著差异。 5.6 尽管在这些程序中首选恒定的延长速度，但在发生争议的情况下，除非买方和供应商之间有相反的协议，否则应使用恒定的破裂时间（20±3 s）。 5.7 抓取试验程序适用于确定 有效强度 织物；也就是说，特定宽度内纱线的强度以及相邻纱线对织物的辅助作用。通过抓取程序确定的断裂力不是实际夹持在夹具之间的纱线强度的反映，不能用于与纱线强度测定直接比较。抓取试样需要更少的准备时间，尽管每个试样需要更多的织物。抓取测试和条带测试之间没有简单的关系，因为织物辅助量取决于织物类型和结构变量。 5. 8. 改进的抓取试验程序适用于测定织物的断裂力，在这种结构中，拉伸应力作用于松弛的条状试样会产生进一步的解离。本试验方法特别适用于高强度织物。

1.1 This test method covers the grab and modified grab test procedures for determining the breaking strength and elongation of most textile fabrics. Provisions are made for wet testing. 1.1.1 The grab test procedure is applicable to woven, nonwoven, and felted fabrics, while the modified grab test procedure is used primarily for woven fabrics. 1.2 This test method is not recommended for glass fabrics, or for knitted fabrics and other textile fabrics which have high stretch (more than 11 %). Note 1: For the determination of the breaking force and elongation of textile fabrics using the raveled strip test procedure and the cut strip test procedure, refer to Test Method D5035 . 1.3 This test method provides the values in both inch-pound units and SI units. Inch-pound units is the technically correct name for the customary units used in the United States. SI units is the technically correct name for the system of metric units known as the International System of Units. The values stated in either acceptable metric units or in other units shall be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining in any way. 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 The grab test procedure in this test method for the determination of breaking force and elongation is considered satisfactory for acceptance testing of commercial shipments of most woven or nonwoven textile fabrics, and the modified grab test procedure is considered satisfactory for acceptance testing of commercial shipments of most woven textile fabrics, since the procedures have been used extensively in the trade for acceptance testing. 5.1.1 In case of disagreement arising from differences in reported test values when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens which are as homogeneous as possible and which are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student's t -test for unpaired data and an acceptable probability level chosen by the two parties before testing is begun. If a bias is found, either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future test results in light of the known bias. 5.2 This test method is not recommended for knitted fabrics because of their high stretch. 5.3 Some modification of technique may be necessary for any fabric having a strength in excess of 200-N/cm (1140-lb/in.) width. Special precautionary measures are provided for use when necessary for strong fabrics. 5.4 All of the procedures are applicable for testing fabrics either conditioned or wet. 5.5 Comparison of results from tensile testing machines operating on different principles is not recommended. When different types of machines are used for comparison testing, constant-time-to-break at 20 ± 3 s is the established way of producing data. Even then the data may differ significantly. 5.6 Although a constant-rate-of-extension is preferred in these procedures, in cases of dispute, unless there is agreement to the contrary between the purchaser and the supplier, a constant-time-to-break (20 ± 3 s) is to be used. 5.7 The grab test procedure is applicable to the determination of the effective strength of the fabric; that is, the strength of the yarns in a specific width together with the fabric assistance from the adjacent yarns. The breaking force determined by the grab procedure is not a reflection of the strength of the yarns actually gripped between clamps and cannot be used for direct comparison with yarn strength determinations. Grab test specimens require much less time to prepare although they require more fabric per specimen. There is no simple relationship between grab tests and strip tests since the amount of fabric assistance depends on the type of fabric and construction variables. 5.8 The modified grab test procedure is applicable to the determination of the breaking force of fabrics with constructions in which the application of tensile stress on raveled strip specimens produces further unraveling. This test method is particularly applicable to high-strength fabrics.