1.1 本试验方法涵盖了具有高弹性和低张力良好恢复性的织物的测量。当施加已知载荷时，测量织物拉伸。在应用已知延伸并随后移除后，评估织物生长。 1.2 织物拉伸和织物生长的程序可以一起使用，也可以单独使用。 1.3 虽然本试验方法可用于针织物，但使用其他试验方法可以更好地评估用于支撑或其他应用的织物: D3107 , D4964 , D6614 . 1.4 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。 1.5 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。 1.6 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 织物拉伸和织物生长有助于选择需要拉伸的织物，但也可以恢复其原始形状。 5.1.1 在服装中，织物的弹性可由多种因素引起。当织物需要适应运动时，例如运动服和其他宽松服装（也称为舒适弹力服装）或外部应力（例如抓取和拉扯），会产生瞬时应力。 此外，舒适的服装可能会承受长时间的压力，例如拉伸以适应坐姿等位置。另一个延长应力的例子是，当织物需要拉伸以适应身体的形状时，例如泳衣、固定式宽松裤和其他合身服装（也称为半支撑服装）。 5.1.2 织物的生长也可以对各种应力作出反应。该方法评估了由于暴露在长期应力下而导致的织物生长。在合身服装中，织物生长可以应用于长时间穿着或在长时间的压力下（如坐着）穿着的服装。去除衣服或压力后，可以看到并评估其生长。 5.2 不建议将此试验方法用于商业装运的验收试验，因为已知实验室间精度较差。 5.2.1 如果两个实验室（或更多实验室）的报告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，并使用适当的统计协助。 至少应确保使用的测试样品尽可能均匀，从获得不同测试结果的材料中提取，并以相同数量随机分配给每个实验室进行测试。应使用未配对数据的统计测试，在测试系列之前选择的概率水平上，比较两个实验室的测试结果。如果发现偏差，必须找到并纠正其原因，或者考虑到已知偏差，必须调整该材料的未来测试结果。

1.1 This test method covers the measurement of fabrics that exhibit high stretch and good recovery from low tension. Fabric stretch is measured when a known load is applied. Fabric growth is evaluated after a known extension is applied and subsequently removed. 1.2 The procedures for fabric stretch and fabric growth can be used together, or individually. 1.3 While this test method can be used for a knit fabric, fabrics intended for support or other applications are better evaluated using other test methods: D3107 , D4964 , D6614 . 1.4 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. 1.5 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. 1.6 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 Fabric stretch and fabric growth are useful in selection of fabrics that are required to stretch, but also recover to their original shape. 5.1.1 In apparel, fabric stretch can be caused by a variety of factors. A momentary stress occurs when a fabric is required to accommodate movement, such as sportswear and other loose-fitting apparel (also known as comfort stretch apparel) or external stress such as grabbing and pulling. Additionally, comfort apparel can be subjected to prolonged stress, such as stretching to accommodate positions such as sitting. Another example of prolonged stress occurs when a fabric is required to stretch to accommodate fitting the form of the body, such as swimwear, anchored slacks, and other form-fitting apparel (also known as semi-support apparel). 5.1.2 Fabric growth can also be in response to a variety of stresses. This method evaluates fabric growth due to exposure to prolonged stresses. In form-fitting apparel, fabric growth can apply as garments are worn for a prolonged period of time or under long periods of stress such as sitting. Upon removal of garments or stress, its growth can be seen and evaluated. 5.2 This test method is not recommended for acceptance testing of commercial shipment because the between-laboratory precision is known to be poor. 5.2.1 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, ensure the test samples to be used are as homogeneous as possible, are drawn from the material from which the disparate test results are obtained, and are assigned randomly in equal numbers to each laboratory for testing. 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 for that material must be adjusted in consideration of the known bias.