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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 20000905-08; Lyon(FR) >Modelling Friction in Elastohydrodynamic Lubricated Conjunctions
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Modelling Friction in Elastohydrodynamic Lubricated Conjunctions

机译：弹性流体动力润滑连接中的摩擦建模

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摘要

This paper presents a new formulation for predicting friction and temperature in EHL conjunctions. A major feature of the model is to propose two distinct rheological behaviours, solid-like and liquid, to account for the conditions where the lubricant is below or above its glass transition in the EHL conjunction. Additionally, a new approach is introduced to obtain friction in the solidified region. Here friction is regarded as an interfacial condition, associated with the characteristics of a thin shear-zone close to the bounding surfaces. To test the model, the surface temperature rise in the high pressure region was investigated. Similar analyses were also performed with various other thermal formulations, namely; (ⅰ) the full conventional thermal approach; (ⅱ) the parabolic temperature approximation across the film and; (ⅲ) the flash temperature concept. In particular, the analytical developments show that values of surface temperatures obtained under dry conditions do not converge towards those predicted with a thermal and lubricated conventional approach, even at extremely small film thicknesses. Findings also reveal that the parabolic temperature profile is unsuitable for analysing lubricated conjunctions under extremely small film thicknesses. In contrast, the new formulation enables an extremely good agreement to be obtained with the flash temperature values when a specific slip condition across the film is imposed. For other slip conditions, the study shows that temperatures at both surfaces take diverging values from those predicted under dry contact conditions as the slide/roll increases.
机译：本文提出了一种预测EHL接头中的摩擦和温度的新公式。该模型的主要特征是提出两种不同的流变行为（固体和液体），以说明在EHL连接中润滑剂低于或高于其玻璃化转变的条件。另外，引入了一种新方法来在固化区域中获得摩擦。这里，摩擦被认为是一种界面条件，与靠近边界表面的薄剪切区的特性有关。为了测试该模型，研究了高压区域的表面温度升高。还对各种其他热配方进行了类似的分析，即： （ⅰ）完整的常规热学方法； （ⅱ）整个薄膜的抛物线温度近似值；以及（ⅲ）闪光灯的温度概念。特别地，分析进展表明，即使在极小的膜厚度下，在干燥条件下获得的表面温度值也不会收敛于通过热和润滑常规方法预测的值。研究结果还表明，抛物线温度曲线不适用于在极小的薄膜厚度下分析润滑接头。相反，当在薄膜上施加特定的滑移条件时，新的配方可以实现与闪点温度值的极佳一致性。对于其他滑移条件，研究表明，随着滑动/滚动的增加，两个表面的温度与在干燥接触条件下预测的温度会有偏差。

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