1.1 这些试验方法涵盖了使用旋转粘度计测定油漆、油墨和相关液体材料屈服应力值的三种方法。第一种方法使用具有同轴圆柱、锥/板或板/板几何形状的旋转粘度计。第二种方法使用在具有类似几何形状的受控应力模式下运行的流变仪。第三种方法使用带有叶片主轴的粘度计。 1.2 落针粘度计（FNV）是一种非旋转技术，也可用于测量油漆、油墨和相关材料的屈服应力值。见测试方法 D5478 ，试验方法D，屈服应力测定详情。 1.3 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。 1.4 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 材料的屈服应力是对材料在管道中、通过泵或从喷嘴开始移动所需的力的测量。屈服应力还表征了材料保持颗粒悬浮的能力。除了粘度测量外，屈服应力测量还有助于确定流动问题（如过度桔皮和流挂）的根本原因，并解释对此类问题的阻力。 涂覆涂层后，流动和流平倾向于与屈服应力成反比，抗下垂倾向于与屈服应力成直接关系。汽车底漆保持铝和/或云母片取向的能力与屈服应力有关（直接关系）。

1.1 These test methods cover three approaches for determining yield stress values of paints, inks and related liquid materials using rotational viscometers. The first method uses a rotational viscometer with coaxial cylinder, cone/plate, or plate/plate geometry. The second method uses a rheometer operating in controlled stress mode with similar geometries. The third method uses a viscometer with a vane spindle. 1.2 A non-rotational technique, the falling needle viscometer (FNV), also can be used to measure yield stress values in paints, inks and related materials. See Test Methods D5478 , Test Method D, Yield Stress Determination for details. 1.3 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. 1.4 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 The yield stress of a material is a measure of the amount of force required to initiate movement of that material in a pipe, through a pump, or from nozzle. The yield stress also characterizes the ability of the material to maintain particles in suspension. Along with viscosity measurements, yield stress measurements have been useful in establishing root causes of flow problems such as excessive orange peel and sagging and in explaining resistance to such problems. After a coating has been applied, flow and leveling tends to be inversely related to yield stress and sag resistance tends to be directly related to yield stress. The ability of an automotive basecoat to keep aluminum and/or mica flakes oriented has been related to yield stress (direct relationship).