1.1 本试验方法包括根据在声波振荡器中辐照油样引起的永久粘度损失来评估含油聚合物的剪切稳定性。在基础油或聚合物没有变化的情况下，该测试方法可用于预测油中该特性的连续性。本试验方法并非用于预测在役含聚合物油的性能。 1.2 已有证据表明，通过声波振荡获得的剪切退化结果与在机械设备中获得的结果之间的相关性可能很差。汽车发动机尤其如此。进一步的证据表明，与机械装置相比，声波技术可能以不同的顺序对不同系列的聚合物进行评级。 2. , 3. 1.3 由于这些限制，本试验方法所属的委员会开发了使用柴油喷射器喷嘴的替代剪切试验方法，即试验方法 D5275 , D6278 和 D7109 . 虽然这些试验方法在曲轴箱油的评估中发现了一些实用性，但施加到样品上的应力不足以剪切飞机液压液中的抗剪切型聚合物。 1.4 本试验方法用于聚合物添加剂规格，尤其是在液压油市场。 1.5 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.6 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。 1.7 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====== 4.1 本试验方法允许在一些应用中可能存在的热因素和氧化因素的干扰最小的情况下评估剪切稳定性。在本试验方法范围内，它已成功应用于液压油、变速箱油、拖拉机油和其他类似应用的油液。已发现其适用于包含易剪切和抗剪切聚合物的流体。迄今为止，在汽车发动机应用的情况下，与性能的相关性尚未确定。

1.1 This test method covers the evaluation of the shear stability of an oil containing polymer in terms of the permanent loss in viscosity that results from irradiating a sample of the oil in a sonic oscillator. This test method can be useful in predicting the continuity of this property in an oil where no change is made in the base stock or the polymer. It is not intended that this test method serve to predict the performance of polymer-containing oils in service. 1.2 Evidence has been presented that correlation between the shear degradation results obtained by means of sonic oscillation and those obtained in mechanical devices can be poor. This is especially true in the case of automotive engines. Further evidence indicates that the sonic technique may rate different families of polymers in a different order than mechanical devices. 2 , 3 1.3 Because of these limitations, the committee under whose jurisdiction this test method falls has developed alternative shear test methods using a diesel injector nozzle, Test Methods D5275 , D6278 , and D7109 . While those test methods have found some utility in the evaluation of crankcase oils, the stress imparted to the sample has been found to be insufficient to shear polymers of the shear-resistant type found in aircraft hydraulic fluids. 1.4 This test method is used for polymeric additive specifications, especially in the hydraulic fluid market. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 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 ====== 4.1 This test method permits the evaluation of shear stability with minimum interference from thermal and oxidative factors which may be present in some applications. Within the limitations expressed in the scope of this test method, it has been successfully applied to hydraulic fluids, transmission fluids, tractor fluids, and other fluids of similar applications. It has been found applicable to fluids containing both readily sheared and shear-resistant polymers. Correlation with performance in the case of automotive engine applications has, to date, not been established.