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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 19990914-17; Leeds(GB) >Determination of lubricant compressibility in EHL conjunctions using the Hybrid technique
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Determination of lubricant compressibility in EHL conjunctions using the Hybrid technique

机译：使用混合技术确定EHL连接处的润滑剂可压缩性

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摘要

Detailed two-dimensional EHL film thickness maps can be obtained experimentally by using a Ball&Disc Apparatus, optical interferometry and image analysis. It is possible to compute the deformation of the surfaces, from the measured film thickness map, since the undeformed contact geometry of the ball and disc is known. By assuming linear elastic deformation it is also possible to numerically determine the contact pressure distribution. This experimentalumerical approach has been called the Hybrid technique. The problem addressed here can be stated as follows: Can the very detailed film thickness map, and its corresponding pressure distribution, be used for the determination of lubricant parameters such as bulk modulus and density? The answer is yes but the quality of the results are very much dependent on the accuracy of the film thickness measurements and the corresponding pressure calculation. The refractive index have to be known everywhere in the EHL contact, i.e. the relationship between pressure and refractive index is required if refractive index cannot be measured directly. The method was applied on a PAO oil and the bulk modulus was determined over a pressure range of 250 MPa to 500 MPa. By using dilatometry results for the pressure range from zero to 100 Mpa it was also possible to determine the density in the pressure range from zero up to 500 MPa. The results are promising and if the accuracy can be improved further the method described can be a useful tool for determining lubricant pressure-deformation relationships.
机译：可以使用Ball＆Disc仪器，光学干涉仪和图像分析通过实验获得详细的二维EHL膜厚图。因为已知球和盘的未变形的接触几何形状，所以可以根据测得的膜厚图来计算表面的变形。通过假设线性弹性变形，也可以数值确定接触压力分布。这种实验/数字方法被称为混合技术。这里解决的问题可以说如下：非常详细的膜厚图及其对应的压力分布可以用于确定润滑剂参数，例如体积模量和密度吗？答案是肯定的，但是结果的质量在很大程度上取决于薄膜厚度测量的准确性和相应的压力计算。折射率必须在EHL触点的任何地方都是已知的，即，如果无法直接测量折射率，则需要压力和折射率之间的关系。将该方法应用于PAO油，并在250 MPa至500 MPa的压力范围内确定了体积模量。通过对从零到100 Mpa的压力范围使用膨胀法测量结果，也可以确定从零到500 MPa的压力范围内的密度。结果是有希望的，并且如果可以进一步提高精度，则所描述的方法可以是确定润滑剂压力-变形关系的有用工具。

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