1.1 本试验方法包括织物刚度特性的测量。测量弯曲长度并计算弯曲刚度。提供了两个程序。 1.1.1 选项A-- 悬臂测试，采用织物在自身质量下的悬臂弯曲原理。 1.1.2 选项B-- 心环测试，采用织物条上形成的环并垂直悬挂的原理。 1.2 该测试方法适用于大多数织物，包括机织织物、安全气囊织物、毛毯、尿布织物、针织织物、分层织物、绒毛织物。 织物可以是未处理的、大尺寸的、涂覆的、树脂处理的或以其他方式处理的。 1.2.1 该方法可用于测定非织造材料（例如，水刺、干铺、针刺、树脂粘合、热铺和湿铺）的硬度，或参考试验方法 D5732 .要测定医用纺织品（例如，外科网状物、薄膜和薄膜）的硬度，请参考试验方法 F3260 。 注1: 弯曲刚度的计算公式 D5732 -95（2001）是不正确的，不应使用。 使用试验方法11.5中给出的公式 D1388 。 1.3 单位-- 以国际单位制表示的数值应视为标准。SI单位后括号中给出的值仅供参考，不视为标准值。 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）。本标准的使用者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》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 一般来说，这些程序比针织物更适合测试机织物。 5.2 该测试方法中的两种测试方案都被认为是符合商业装运验收测试要求的，因为目前估计介于- 实验室精度是可接受的，该方法在验收测试行业中广泛使用。 5.2.1 如果在使用该测试方法对商业货物进行验收测试时，由于报告的测试结果存在差异而产生争议，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适当的统计协助。作为最低要求，双方应采取一组尽可能均匀的试样，这些试样来自大量相关类型的材料。 然后，应将试样以相等数量随机分配到每个实验室进行测试。在测试开始前，应使用适当的统计分析和双方选择的可接受概率水平对两个实验室的平均结果进行比较。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在考虑已知偏差的情况下解释未来的测试结果。 5.3 织物的硬度可能会随着储存而变化。 5.4 没有发现任何证据表明弯曲长度取决于试样的宽度。由于试样边缘的刚性，试样卷曲或扭曲的趋势将影响结果。因此，条带越宽，边缘效应就越不重要。对于只有轻微卷曲倾向的织物，发现2.5厘米宽的条带是令人满意的。随着卷曲趋势的增加，该宽度可能会增加（参见 附注10 )。 5.5 此方法与测试方法不同 F3260 其需要跟踪样品表面取向，并用于评估可吸收和部分可吸收的医用纺织品。

1.1 This test method covers the measurement of stiffness properties of fabrics. Bending length is measured and flexural rigidity is calculated. Two procedures are provided. 1.1.1 Option A— Cantilever Test, employing the principle of cantilever bending of the fabric under its own mass. 1.1.2 Option B— Heart Loop Test, employing the principle of a loop formed in a fabric strip and hung vertically. 1.2 This test method applies to most fabrics including woven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics, layered fabrics, pile fabrics. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated. 1.2.1 This method may be used to determine the stiffness of nonwoven materials (for example, hydroentangled, dry laid, needlepunch, resin bonded, thermal, and wet laid) or refer to Test Method D5732 . To determine the stiffness of medical textiles (for example, surgical mesh, films, and membranes), refer to Test Method F3260 . Note 1: The formula to calculate flexural rigidity in D5732 -95 (2001) is incorrect and should not be used. Utilize the formula presented in 11.5 of Test Method D1388 . 1.3 Units— The values stated in SI units are to be regarded as the standard. The values given in parentheses after SI units are provided for information only and are not considered 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 In general, these procedures are more suitable for testing woven fabrics than knit fabrics. 5.2 Both test options in this test method are considered satisfactory for acceptance testing of commercial shipments since current estimates of between-laboratory precision are acceptable and the method is used extensively in the trade for acceptance testing. 5.2.1 In case of a dispute arising from differences in reported test results 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 that are as homogeneous as possible and that are from a lot of material of the type in question. 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 the appropriate statistical analysis 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 with consideration to the known bias. 5.3 The stiffness of a fabric may change with storage. 5.4 No evidence has been found showing that bending length is dependent on the width of the test specimen. The tendency for specimens to curl or twist will affect the result, because of the rigidity provided at the edge of the specimen. Consequently, the wider the strip, the less important is the edge effect. For fabrics having only a slight tendency to curl, a 2.5 cm wide strip has been found to be satisfactory. As the tendency to curl increases, this width may be increased (see Note 10 ). 5.5 This method differs from Test Method F3260 which requires tracking of sample surface orientation, and is used to evaluate absorbable and partially absorbable medical textiles.