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首页> 外文期刊>Tribology International >A non-averaging method of determining the rheological properties of traction fluids
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A non-averaging method of determining the rheological properties of traction fluids

机译：确定牵引液流变性的非平均方法

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Traction machines have been frequently used to study the rheological responses of lubricants in elastohydrodynamic lubrication (EHL) contacts. Fundamental properties are inferred from EHL traction measurements based on the average pressures and temperatures in the contact. This average approach leads to uncertainty in the accuracy of the results due to the highly nonlinear resonse of the fluid such as viscosity to both pressure and temperature. A non-averaging method is developed in this paper to study the elastic and plastic properties of traction fluids operating in EHL contacts at small slide-to-roll ratios. A precision line-contact traction rig is used to measure the EHL traction at a given oil temperature and Hertz pressure. By choosing a sensible pressure-property expression, the parameters of the expression can be determined through the initial slope and peak traction coefficient of the traction measurements. The elastic shear modulus and the limiting shear stress of the lubricant corresponding to a single pressure can then be calculated for a range of pressures and temperatures of practical interest. Two high-traction fluids are studied, and their elastic moduli and limiting shear stresses presented.
机译：牵引机已广泛用于研究弹性流体动力润滑（EHL）接触件中润滑剂的流变响应。根据接触中的平均压力和温度，从EHL牵引力测量中可以推断出基本性能。由于流体的高度非线性共振（例如对压力和温度的粘度），这种平均方法导致结果准确性的不确定性。本文开发了一种非平均方法来研究在小滚动比下在EHL接触中运行的牵引流体的弹性和塑性特性。在给定的油温和赫兹压力下，精密线接触式牵引装置用于测量EHL牵引力。通过选择一个合理的压力属性表达式，可以通过牵引力测量值的初始斜率和峰值牵引系数来确定该表达式的参数。然后可以针对实际需要的一系列压力和温度计算出对应于单个压力的润滑剂的弹性剪切模量和极限剪切应力。研究了两种高牵引力流体，并给出了它们的弹性模量和极限剪切应力。

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