1.1 本试验方法用于开发试验数据，从中可以评估聚烯烃土工膜板材在恒定拉伸载荷条件和加速环境条件下对应力开裂的敏感性。 1.2 本试验方法测量给定试样在规定拉伸载荷水平下的失效时间。利用一系列负载水平的一系列此类测试的结果可用于在对数轴上构建应力-时间图。 1.3 以国际单位制表示的数值应视为标准。 括号中给出的英寸-磅单位仅供参考。 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、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（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 本试验方法无意解释产生的响应曲线。此类解释由参与调试和测试结果报告的各方负责。 5.2 本试验方法旨在作为指数试验，并可用于对聚烯烃土工膜板的应力开裂敏感性进行分级。 5.2.1 可能影响应力开裂的条件包括:加载水平、测试温度和环境、微观结构、聚合物添加剂包装、加工历史和热历史。 5.3 本试验方法适用于光滑、均匀的聚烯烃土工膜，其中两侧平行，以允许在由一侧土工膜表面和另一侧缺口底部分隔的明确表面上施加应力。 5.4 本试验适用于按中所述制备的纹理土工膜 8.3.2 . 5.5 该试验可适用于多组分土工膜（例如白色、导电或其他非均质片材），或仅限于在按照中所述制备时对基础聚合物的评估 8.3.3 . 5.6 该试验不适用于沥青、三元乙丙橡胶、增塑聚氯乙烯和其他非聚烯烃土工膜，因为这些材料不易缓慢裂纹扩展。 5.7 本试验方法不适用于未表现出明确屈服点的聚烯烃土工膜，例如一些VLDPE和LLDPE。

1.1 This test method is used to develop test data from which the susceptibility of polyolefin geomembrane sheet material to stress cracking under a constant tensile load condition and an accelerated environmental condition can be evaluated. 1.2 This test method measures the failure time associated with a given test specimen at a specified tensile load level. Results from a series of such tests utilizing a range of load levels can be used to construct a stress-time plot on a log-log axis. 1.3 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are provided 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, 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 This test method does not purport to interpret the resulting response curve. Such interpretation is left to the parties involved in the commissioning and reporting of the test results. 5.2 This test method is intended as an index test and may be used for grading polyolefin geomembrane sheets in regard to their stress-cracking sensitivity. 5.2.1 Conditions that can affect stress cracking include: level of loading, test temperature and environment, microstructure, polymer additive package, processing history, and thermal history. 5.3 The test method is applicable to smooth, homogeneous polyolefin geomembranes where the two sides are parallel to permit application of the stress on a well-defined surface delimited by the surface of the geomembrane on one side, and the bottom of the notch on the other side. 5.4 The test is applicable to textured geomembranes when prepared as described in 8.3.2 . 5.5 The test may be applicable to multi-component geomembranes (such as white, conductive, or other non-homogeneous sheets) or limited to the evaluation of the base polymer when prepared as described in 8.3.3 . 5.6 The test is not applicable to bituminous, EPDM, plasticized PVC, and other non-polyolefin geomembranes, as these materials are not susceptible to slow crack growth. 5.7 This test method may not be applied to polyolefin geomembranes that do not exhibit a well-defined yield point, such as some VLDPE and LLDPE.