1.1 本试验方法包括根据在声波振荡器中照射液压流体样品产生的最终粘度来评估液压流体的剪切稳定性。 1.2 有证据表明，由声波振荡引起的剪切退化与叶片泵试验程序中获得的剪切退化之间存在良好的相关性。 2. 1.3 此测试方法使用毫米平方每秒（mm 2. /s） ，国际单位制单位，作为粘度的单位。有关信息，括号中显示了等效单位cSt。 1.4 该方法的精度仅适用于辐照运动粘度在10之间的液压流体 毫米 2. /s和50 毫米 2. /s或粘度损失百分比在5之间 % 和45 %, 循环样本所覆盖的范围。 1.5 本标准并不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====== 5.1 此测试方法是使用测试方法开发的 D2603 – 91. 5.2 该试验方法允许在某些应用中可能存在的热和氧化因素干扰最小的情况下评估剪切稳定性。 已经发现它适用于含有易剪切和抗剪切聚合物的流体。在液压应用的情况下，已经建立了与性能的相关性。

1.1 This test method covers the evaluation of the shear stability of hydraulic fluids in terms of the final viscosity that results from irradiating a sample of the hydraulic fluid in a sonic oscillator. 1.2 Evidence has been presented that a good correlation exists between the shear degradation that results from sonic oscillation and that obtained in a vane pump test procedure. 2 1.3 This test method uses millimetres squared per second (mm 2 /s), an SI unit, as the unit of viscosity. For information, the equivalent unit, cSt, is shown in parentheses. 1.4 Precision of the method has only been determined for hydraulic fluids with irradiated kinematic viscosities between 10 mm 2 /s and 50 mm 2 /s or percent viscosity loss between 5 % and 45 %, the ranges covered by the round robin samples. 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 ====== 5.1 This test method was developed using Test Method D2603 – 91. 5.2 This test method permits the evaluation of shear stability with minimum interference from thermal and oxidative factors that may be present in some applications. It has been found applicable to fluids containing both readily sheared and shear-resistant polymers. Correlation with performance in the case of hydraulic applications has been established.