1.1 本试验方法包括通过圆形弯曲程序测定织物的刚度。 1.2 本试验方法通常适用于所有类型的织物，包括任何纤维含量的机织物、针织物和非织造布。 注1: 有关刚度的其他测试方法，请参阅测试方法 D1388 . 1.3 以国际单位制表示的数值应视为标准值；以英寸-磅为单位的数值仅供参考。 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1 试验方法 D4032号 对于测试织物的刚度，质量控制测试是令人满意的。由于该测试方法已广泛用于贸易领域，因此也可用于商业装运的验收测试。如果买方和卖方使用测试方法报告的数值存在差异 D4032号 对于验收测试，买方和卖方实验室之间的统计偏差（如有）应根据从被评估类型的大量材料中均匀采集的样本测试进行每次比较。样本应以相同数量随机分配给每个实验室。 5.2 圆形弯曲程序给出了与织物刚度相关的力值，同时平均了所有方向的刚度。试验方法中的刚度试验 D1388 为单向型。 5.3 圆弯曲程序操作简单，可用于针织物、机织物或非织造布，前提是计量能力与测试的织物范围一致。

1.1 This test method covers the determination of the stiffness of fabrics by the circular bend procedure. 1.2 This test method is generally applicable to all types of fabrics, including woven, knitted and nonwovens, of any fiber content. Note 1: For other methods of testing for stiffness, refer to Test Methods D1388 . 1.3 The values stated in SI units are to be considered as standard; the values in inch-pound units are included for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 5.1 Test Method D4032 for testing stiffness of fabrics is considered satisfactory for quality control testing. It may also be used for acceptance testing of commercial shipments since the test method has been used extensively in the trade field. In cases of differences in values reported by purchaser and seller using Test Method D4032 for acceptance testing, the statistical bias, if any, between the laboratories of the purchaser and the seller should be determined with each comparison being based on the testing of specimens taken homogeneously from a lot of material of the type being evaluated. Specimens should be randomly assigned in equal numbers to each of the laboratories. 5.2 The circular bend procedure gives a force value related to fabric stiffness, simultaneously averaging stiffness in all directions. The stiffness tests in Test Methods D1388 are of the single directional type. 5.3 The circular bend procedure is simple to perform and may be used for knitted, woven, or nonwoven fabrics, provided gage capacity is in keeping with fabric range tested.