1.1 本试验方法包括测定经历拉伸应变循环的橡胶化合物的疲劳寿命。在部分循环期间，应变松弛至零值。对试样进行测试时，没有故意产生的缺陷、切口或裂纹。试样完全破裂表明失效。 1.2 这些测试结果与服务之间没有给出或暗示确切的相关性。这是由于使用条件的不同性质造成的。这些试验程序确实产生了数据，可用于比较评估橡胶化合物抵抗（动态）拉伸循环疲劳的能力。 1.3 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考。 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 本试验方法涵盖了一个确定不同延伸率下疲劳寿命的程序。应变循环是规定试验装置类型的特征。疲劳试验的经验表明，疲劳寿命可能具有广泛的非正态分布，因此，具有较大的标准差，这取决于化合物。例如，天然橡胶的分布范围比许多合成橡胶要窄。因此，可能需要大量样本才能获得所需的精度。比较不同的橡胶化合物时，应适当考虑每种化合物的标准偏差（见 7.1 ). 5.2 本试验方法中产生的疲劳数据主要给出了硫化橡胶裂纹起始行为的估计值，并且仅给出了裂纹扩展速率的非常近似的测量值。获得的信息可能有助于预测现役化合物的弯曲寿命性能；然而，用户应注意，在实际使用中，产品会受到本试验方法中未测量的许多其他疲劳因素的影响。

1.1 This test method covers the determination of fatigue life of rubber compounds undergoing a tensile-strain cycle. During part of the cycle, the strain is relaxed to a zero value. The specimens are tested without intentionally initiated flaws, cuts, or cracks. Failure is indicated by a complete rupture of the test specimen. 1.2 No exact correlation between these test results and service is given or implied. This is due to the varied nature of service conditions. These test procedures do yield data that can be used for the comparative evaluation of rubber compounds for their ability to resist (dynamic) extension cycling fatigue. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are 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 covers one procedure for determining fatigue life at various extension-ratios. The strain cycle is characteristic of the type of test apparatus specified. Experience in fatigue testing shows that fatigue life may have a wide, non-normal distribution and, therefore, a large standard deviation that is compound dependent. Natural rubber, for example, has shown a narrower distribution than many synthetic rubbers. A large number of specimens may, therefore, be required to yield the desired precision. Comparison of different rubber compounds should be made with due consideration to the standard deviation for each (see 7.1 ). 5.2 Fatigue data, as generated in this test method, give primarily an estimate of the crack initation behavior of a rubber vulcanizate and only a very approximate measure of the crack propagation rate. The information obtained may be useful in predicting the flex-life performance of a compound in active service; however, the user should be aware that in actual use, products are subjected to many other fatigue factors not measured in this test method.