ANSI/ASTM D4684-2006 测定低温发动机油屈服应力和表观粘度的试验方法

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                   【英文标准名称】:     Test Method for Determination of Yield Stress and Apparent Viscosity of Engine Oils at Low Temperature (05.03)            【原文标准名称】:     测定低温发动机油屈服应力和表观粘度的试验方法            【标准号】:     ANSI/ASTM D4684-2006            【标准状态】:     作废            【国别】:     美国            【发布日期】:     2006    【实施或试行日期】: 2006-11-21【发布单位】: 美国国家标准学会(US-ANSI)【起草单位】: ANSI【标准类型】: ()【标准水平】: ()【中文主题词】: 石油产品;试验;粘度;低温;润滑剂;屈服应力【英文主题词】: Low temperatures;Lubricantsetroleum products;Testing;Viscosity;Yield stress【摘要】: This test method covers the measurement of the yield stress and viscosity of engine oils after cooling at controlled rates over a period exceeding 45 h to a final test temperature between -10 and -40?C. The viscosity measurements are made at a shear stress of 525 Pa over a shear rate of 0.4 to 15 s. The viscosity as measured at this shear stress was found to produce the best correlation between the temperature at which the viscosity reached a critical value and borderline pumping failure temperature in engines.   Procedure A of this test method has precision stated for a yield range from less than 35 Pa to 210 Pa and apparent viscosity range from 4300 to 270 000 mPas. The test procedure can determine higher yield stress and viscosity levels.   This test method is applicable for unused oils, sometimes referred to as fresh oils, designed for both light duty and heavy duty engine applications. It also has been shown to be suitable for used diesel and gasoline engine oils. The applicability to petroleum products other than engine oils has not been determined.   This test method uses the milliPascal second (m?Pas) as the unit of viscosity. For information, the equivalent unit, centiPoise (cP), is shown in parentheses.   This test method contain two procedures: Procedure A incorporates several equipment and procedural modifications from Test Method D 4684-02 that have shown to improve the precision of the test, while Procedure B is unchanged from Test Method D 4684-02. Additionally, Procedure A applies to those instruments that utilize thermoelectric cooling technology and those that use indirect refrigeration technology of recent manufacture for instrument temperature control. Procedure B can use the same instruments used in Procedure A or those cooled by circulating methanol. 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 and health practices and determine the applicability of regulatory limitations prior to use.【中国标准分类号】: E34【国际标准分类号】: 75_100【页数】: 【正文语种】: 英语