1.1 本试验方法包括使用记录恒定拉伸速率型（CRE）拉伸试验机通过梯形程序测量织物的撕裂强度。 1.1.1 CRE型拉伸试验机已成为测定梯形撕裂强度的首选试验装置。人们认识到，一些恒速横移式（CRT）拉伸试验机仍在继续使用。因此，当买方和供应商达成一致意见时，可以使用这些测试仪器。CRT型拉伸试验机的使用条件包括在 附录X1 . 1.2 该试验方法适用于大多数织物，包括机织物、安全气囊织物、毯子、尿布织物、针织物、分层织物、绒毛织物和非织造织物。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。 提供了润湿或不润湿试样的测试说明。 1.3 按照本试验方法测量的撕裂强度要求在试验前开始撕裂。所获得的报告值与引发或开始撕裂所需的力没有直接关系。 1.4 提供了梯形撕裂强度的两种计算方法:单峰值力和五个最高峰值力的平均值。 1.5 以国际单位制表示的数值应视为标准。以英寸-磅为单位的数值可能是近似值。 1.6 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。 1.7 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 这种测试方法被认为是令人满意的商业货物验收测试，因为目前对实验室间精度的估计是可以接受的，而且这种测试方法在验收测试行业中广泛使用。 5.2 如果两个实验室（或多个实验室）的测试结果之间存在实际意义上的差异，则应使用主管的统计协助进行比较测试，以确定它们之间是否存在统计偏差。作为最低要求，使用尽可能均匀的样品进行比较试验，这些样品取自与初始试验期间产生不同结果的样品相同的材料批次。将相等数量的样本随机分配给每个实验室。应使用未配对数据的统计测试，在测试系列之前选择概率水平，对相关实验室的测试结果进行比较。 如果发现偏差，必须找到并纠正其原因，或者必须在考虑已知偏差的情况下调整该材料的未来测试结果。 5.3 梯形撕裂沿着合理定义的过程产生张力，从而使撕裂在试样的宽度上传播。它可用于估计不同织物或同一织物中不同方向的相对抗撕裂性。 5.4 根据试样的性质，数据记录设备将以一个或多个峰值的形式显示撕裂力。最高峰似乎反映了纱线组分的强度，无论是单独的还是组合的，都需要阻止相同结构织物的撕裂。峰间记录的谷没有特别的意义。然而，最小撕裂力被指示为高于最低谷。 5.5 大多数纺织品都可以用这种测试方法进行测试。对于给定的织物，可能需要对夹紧技术进行一些修改，这取决于其结构。坚固的织物或玻璃纤维制成的织物需要进行特殊调整，以防止它们在夹具中滑动或因夹在夹具中而损坏。在某些情况下，由于织物结构的原因，单根纱线可能不会断裂，但在试样中会出现高峰和纱线变形。在可能的情况下，应防止这种情况发生。如果您已经尝试了所有这些步骤，但纱线仍然发生变形，则必须将其包含在报告中。 5.6 CRE型是首选的拉伸试验机。当买方和供应商达成一致时，该试验方法允许使用CRT型拉伸机。然而，使用CRT获得的结果之间可能没有总体相关性- 类型机器和CRE类型机器。因此，除非买方和供应商之间建立了定量相关性，否则这两种拉伸试验机不能互换使用。在任何情况下，应以CRE型机器为准。

1.1 This test method covers the measurement of the tearing strength of textile fabrics by the trapezoid procedure using a recording constant-rate-of-extension-type (CRE) tensile testing machine. 1.1.1 The CRE-type tensile testing machine has become the preferred test apparatus for determining trapezoid tearing strength. It is recognized that some constant-rate-of-traverse-type (CRT) tensile testing machines continue to be used. Consequently, these test instruments may be used when agreed upon between the purchaser and the supplier. The conditions for use of the CRT-type tensile tester are included in Appendix X1 . 1.2 This test method applies to most fabrics including woven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics, layered fabrics, pile, and nonwoven fabrics. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated. Instructions are provided for testing specimens with or without wetting. 1.3 Tearing strength, as measured in this test method, requires that the tear be initiated before testing. The reported value obtained is not directly related to the force required to initiate or start a tear. 1.4 Two calculations for trapezoid tearing strength are provided: the single-peak force and the average of five highest peak forces. 1.5 The values stated in SI units are to be regarded as the standard. The values stated in inch-pound units may be approximate. 1.6 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. 1.7 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 This test method is considered satisfactory for acceptance testing of commercial shipments because current estimates of between-laboratory precision are acceptable, and this test method is used extensively in the trade for acceptance testing. 5.2 If there are differences of practical significance between test results for two laboratories (or more), comparative test should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use the samples for such a comparative test that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing. Randomly assign the samples in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If 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. 5.3 The trapezoid tear produces tension along a reasonably defined course such that the tear propagates across the width of the specimen. It is useful for estimating the relative tear resistance of different fabrics or different directions in the same fabric. 5.4 Depending on the nature of the specimen, the data recording devices will show the tearing force in the form of a peak or peaks. The highest peaks appear to reflect the strength of the yarn components, individually or in combination, needed to stop a tear in fabrics of the same construction. The valleys recorded between the peaks have no specific significance. The minimum tearing force, however, is indicated to be above the lowest valleys. 5.5 Most textile fabrics can be tested by this test method. Some modification of clamping techniques may be necessary for a given fabric, depending upon its structure. Strong fabrics or fabrics made from glass fibers require special adaptation to prevent them from slipping in the clamps or being damaged as a result of being gripped in the clamps. In some cases, due to fabric constructions, individual yarns may not rupture but show a high peak and yarn distortion within the test specimen. Wherever possible, this shall be prevented. If you have tried all of these steps and yarn distortion still occurs, this must be included in the report. 5.6 The CRE-type is the preferred tensile testing machine. This test method allows the use of the CRT-type tensile machine when agreed upon between the purchaser and the supplier. There may be no overall correlation, however, between the results obtained with the CRT-type machine and the CRE-type machine. Consequently, these two tensile testers cannot be used interchangeably unless the degree of quantitative correlation has been established between the purchaser and the supplier. In any event, the CRE-type machine shall prevail.