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首页> 外文会议>World Tribology Congress III vol.1; 20050912-16; Washington,DC(US) >A PARAMETRIC ANALYSIS OF THE THERMAL SHEAR LOCALIZATION IN EHL FILMS
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A PARAMETRIC ANALYSIS OF THE THERMAL SHEAR LOCALIZATION IN EHL FILMS

机译：EHL薄膜热剪切定位的参数分析

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摘要

Experiments and computer simulations have revealed some unusual results of elastohydrodynamic lubrication (EHL) associated with a high degree of thermally induced inhomogeneous shear across the lubricant film, or thermal shear localization. The results include the development of a sizable film dimple in the central EHL region and a dramatic reduction in EHL traction. In this study, a theoretical analysis is carried out to determine the conditions under which the thermal shear localization may develop in EHL films. For a Newtonian lubricant obeying the Barus law of viscosity, a dimensionless group-parameter is identified that fully governs the degree of the thermal inhomogeneous shear. Results are presented that show the critical range of values of this parameter corresponding to the onset of the shear localization. The analysis is also extended to lubricants with non-Newtonian behavior. Results suggest that the same dimensionless group-parameter may be used to measure the degree of the shear localization when the lubricant viscosity in the parameter is replaced by an effective viscosity that accounts for the non-Newtonian effect. Reference presents details of the theoretical formulation and results analysis.
机译：实验和计算机模拟已经揭示了弹性流体动力润滑（EHL）的一些不寻常结果，这些结果与在整个润滑膜上发生的高度热诱导的不均匀剪切或热剪切局部化有关。结果包括在EHL中央区域形成了相当大的薄膜凹坑，并大大降低了EHL牵引力。在这项研究中，进行了理论分析，以确定在EHL薄膜中可能出现热剪切局部化的条件。对于遵循粘度的巴鲁斯定律的牛顿润滑剂，确定了一个无量纲的组参数，该参数完全控制了热不均匀剪切的程度。结果表明，该参数的临界值范围对应于剪切局部化的开始。该分析还扩展到具有非牛顿特性的润滑剂。结果表明，当参数中的润滑剂粘度被解释为非牛顿效应的有效粘度代替时，相同的无量纲组参数可用于测量剪切局部化的程度。参考资料提供了理论公式和结果分析的详细信息。

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