No. 4129 lubricating oil, a kind of synthetic oil, was widely applied in area of space machinery, while its traction behavior has not been realized. In this work, the elastohydrodynamic properties of No. 4129 have been investigated by subjecting it to our self-made test rig at various experiment conditions. The results revealed that the effect of the load on the traction coefficient is greater when the load exceeds 69 N at a fixed rolling velocity. In addition, the rolling speed exerts a smaller influence on the traction coefficient when rolling speed exceeds 11 m/s at a fixed load. Therefore, this lubricating oil exhibits elastic–plastic rheological properties under the prevailing experimental conditions. Based on the obtained experiment data, we have established a new formulae for calculating the traction coefficients of the lubricating oil. In contrast, the calculated traction coefficients by the formulae were fairly well agreed with the measured data. The resulted theoretical formulae will provide a better direction for No. 4129 used as lubricating oil under a severe working condition in space.
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This research is supported by the National Science Foundation of China (Nos. 51475143, 51105131) and Tianjin Natural Science Foundation (No. 16JCYBJC18900).
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