1.1 该测试方法包括与含有消费后回收HDPE（PCR-HDPE）的HDPE材料一起使用的无缺口恒定韧带应力（UCLS）测试。PCR-HDPE中的污染物可以在高温下引发应力裂纹，该测试方法评估这些材料对恒定施加应力的响应。 1.2 该测试方法主要针对含有PCR-HDPE的HDPE波纹管，但也可用于使用PCR-HDPE时的其他应用。 1.3 该试验使用与NCTL试验相同的装置（试验方法 第5397页 )和NCLS测试（测试方法 第2136页 )，但试验是用不同的试样进行的，并使用水代替表面活性剂溶液。试样比标准NCLS和NCTL试样大，以增加试样中可能产生裂纹的污染物颗粒的数量。 1.4 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 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。 1.6 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====== 4.1 该试验方法是评估含PCR-HDPE的HDPE产品（主要是波纹管）中发现的污染物颗粒影响的一种方法。大量、大小和形状的颗粒会降低产品的缓慢裂纹扩展阻力。该试验在水中进行，没有诸如缺口之类的受控缺陷。由于没有凹口，所以没有必要在水浴中使用表面活性剂。这是一个恒载测试。 4.2 该测试可用于评估回收材料和原始材料的各种混合物。例如，具有高应力抗裂性和少量污染物的材料可以与抗裂性较低的材料混合，以提高混合物的整体应力抗裂性能。 4.3 试验可以在各种温度和应力条件下进行。如果评估了至少三（3）种不同的温度/应力条件，则可以使用双向移动或速率过程方法来预测材料的使用寿命估计值。 4.4 该测试也可以在单个施加的负载和单个温度下进行，以创建用于比较目的和质量控制的单点测试。

1.1 This test method covers an un-notched constant ligament stress (UCLS) test for use with HDPE materials that contain post-consumer recycled HDPE (PCR-HDPE). Contaminants in the PCR-HDPE can initiate stress cracks at elevated temperatures, and this test method evaluates the response of these materials to a constant applied stress. 1.2 The test method is focused on HDPE corrugated pipe containing PCR-HDPE, but can be used in other applications where PCR-HDPE is used. 1.3 The test utilizes the same devices used to perform the NCTL test (Test Method D5397 ) and the NCLS test (Test Method F2136 ), but the test is conducted with different specimens and with the use of water instead of a surfactant solution. The test specimen is larger than standard NCLS and NCTL specimens to increase the number of contaminant particles in the specimen that might grow cracks. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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 ====== 4.1 This test method is a way to evaluate the effects of contaminant particles found in HDPE products containing PCR-HDPE, primarily corrugated pipe. Particles of significant number, size and shape can reduce the slow crack growth resistance of the products. This test is performed in water without a controlled defect such as a notch. Since there is no notch, it is not necessary to use a surfactant in the water bath. It is a constant load test. 4.2 This test may be used to evaluate various blends of recycled and virgin materials. For example, a material with high stress crack resistance and few contaminants can be blended with materials that are less resistant to cracking to enhance the overall stress crack resistance of the blend. 4.3 The test can be conducted at various temperature and stress conditions. If at least three (3) different temperature/stress conditions are evaluated, an estimate of the service lifetime of the material can be predicted with the use of bi-directional shifting or the rate process method. 4.4 The test can also be performed under a single applied load and a single temperature to create a single point test useful for comparative purposes as well as for quality control.