1.1 本试验方法涵盖了在规定的预处理、温度和机器速度条件下试验时，标准哑铃形试样形式的非增强土工膜的拉伸性能的测定。 1.2 该测试方法可用于测试厚度在0.25 mm[0.010 in.]和6.3 mm[0.25 in.]之间的材料。 附注1: 该测试方法不旨在为设计目的精确测量土工膜的物理特性。这是一项旨在用于质量控制和质量标准一致性目的的“指标测试”。从理论角度来看，该测试的恒定十字头移动速率缺乏准确性，因为使用了与实际应变相反的十字头移动。在样品的特定区域中，十字头移动速率和应变速率之间可能存在很大的差异，因为样品不具有均匀的宽度或十字头。截面积。这可能会掩盖这些材料在塑性状态下的重要效果或特性。使用引伸计（不包括在本试验中）可以更准确地测量应变和应变率，但对于某些土工膜仍有局限性。此外，应认识到，如该测试方法所允许的，测试样本厚度的变化会产生此类样本的表面-体积比的变化，并且这些变化可能影响测试结果。因此，在需要直接比较结果的情况下，所有样品应具有相等的厚度。当需要更精确的物理数据时，应使用特殊的附加测试。试验方法 D4885 是适用于许多应用的性能测试。 1.3 以SI单位或英寸表示的值-英镑单位应单独视为标准单位。每个系统中陈述的值不一定完全等同；因此，为确保符合标准，每个系统应独立使用，两个系统的数值不得合并使用。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 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》中确立的国际公认的标准化原则制定的。======意义和用途====== 4.1 本试验方法旨在产生拉伸性能数据，用于控制和规范非增强聚乙烯和柔性非增强聚丙烯土工膜。这些数据对于定性表征和研究和开发也是有用的。根据材料质量标准的建议，可能需要修改本程序以用于测试某些材料。因此，在使用该测试方法之前，建议参考该材料的质量标准。表1分类 D4000 列出当前存在的ASTM材料标准。 4.2 拉伸性能可能随着样品制备、测试速度和测试环境而变化。因此，当需要精确的比较结果时，必须仔细监测和控制这些因素。4.2.1 应当认识到，如果不测试材料的制备方法，就无法测试该材料。因此，当需要对材料进行比较测试时，必须小心确保所有样品以完全相同的方式制备，除非测试包括样品制备的影响。类似地，为了参考目的或任何给定系列样本内的比较，必须注意确保制备、处理和处理细节的最大程度的一致性。

1.1 This test method covers the determination of the tensile properties of nonreinforced geomembranes in the form of standard dumbbell-shaped test specimens when tested under defined conditions of pretreatment, temperature, and machine speed. 1.2 This test method can be used for testing materials thickness between 0.25 mm [0.010 in.] and 6.3 mm [0.25 in.]. Note 1: This test method is not intended to precisely measure physical properties of a geomembrane for design purposes. This is an “index test” intended to be used for quality control and specification conformance purposes. The constant rate of crosshead movement of this test lacks accuracy from a theoretical standpoint, since crosshead movement as opposed to actual strain is used. A wide difference may exist between the rate of crosshead movement and the rate of strain in particular areas of the specimen since the specimen does not have a uniform width or cross-sectional area. This may disguise important effects or characteristics of these materials in the plastic state. Use of an extensometer, not included in this test, would more accurately measure strain and strain rate but would still have limitations for some geomembranes. Further, it is realized that variations in the thicknesses of test specimens, as permitted by this test method, produce variations in the surface-volume ratios of such specimens, and that these variations may influence the test results. Hence, where directly comparable results are desired, all samples should be of equal thickness. Special additional tests should be used where more precise physical data are needed. Test Method D4885 is a suitable performance test for many applications. 1.3 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. 1.4 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 ====== 4.1 This test method is designed to produce tensile property data for the control and specification of nonreinforced polyethylene and flexible nonreinforced polypropylene geomembranes. These data are also useful for qualitative characterization and for research and development. It may be necessary to modify this procedure for use in testing certain materials as recommended by the material specifications. Therefore, it is advisable to refer to that material's specification before using this test method. Table 1 in Classification D4000 lists the ASTM materials standards that currently exist. 4.2 Tensile properties may vary with specimen preparation, test speed, and environment of testing. Consequently, where precise comparative results are desired, these factors must be carefully monitored and controlled. 4.2.1 It is realized that a material cannot be tested without also testing the method of preparation of that material. Hence, when comparative tests of materials are desired, care must be exercised to ensure that all samples are prepared in exactly the same way, unless the test is to include the effects of sample preparation. Similarly, for referee purposes or comparisons within any given series of specimens, care must be taken to secure the maximum degree of uniformity in details of preparation, treatment, and handling.