Effects of Adsorption Film on Thermal Mixed Lubrication Performance

被引：0
|
作者：
Zhang X. [1 ]
Liu X. [1 ]
Sun W. [1 ]
Guo F. [1 ]
机构：
[1] School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong, Qingdao
来源：
Mocaxue Xuebao/Tribology | 2023年 / 43卷 / 05期
基金：
中国国家自然科学基金;
关键词：
adsorption film; average flow model; film thickness ratio; friction coefficient; load ratio; thermal mixed lubrication;
D O I：
10.16078/j.tribology.2021311
中图分类号：
学科分类号：
摘要：
To study the influence of the adsorption film on the performance of thermal mixed lubrication, based on the average flow model, a non-Newtonian thermal mixed lubrication model of circular contact with adsorption film was built, and effects of the adsorption film on thermal mixed lubrication performance was analyzed. Results showed that, the results of the mixed lubrication model presented in this paper were compared with those of the point contact mixed lubrication model in the literature, and the correctness of the program was verified. Compared with the results without considering the adsorption film, the maximum temperature of oil film increased after considering the adsorption film. With the increase of the adsorption film thickness, the maximum temperature of the oil film and the surface of the adsorption film gradually increased, and the thicker the adsorption film, the more obvious the temperature increase. The main parameters of the thermal failure mechanism of the adsorption film were the temperature of the mid layer oil film and the surface temperature of the adsorption film 2. The adsorption film had little effect on the pressure distribution, but decreased the film thickness. There was a suitable adsorption film thickness, the optimal value of the adsorption film thickness was 100 nm. The variation trend of the adsorption film 2 thickness was opposite to that of the adsorption film 2 surface temperature. The established thermal mixed lubrication model could describe the state of boundary lubrication, mixed lubrication and full film lubrication with the influence of adsorption film completely. When the entrainment speed was small, the contact pair was in boundary lubrication, the contact pressure of rough peak was large, the secondary pressure peak was not obvious, the oil film thickness was small, and the oil film necking in the outlet area had not yet formed. With the increase of the entrainment speed, the contact pair was in mixed lubrication, the contact pressure of the rough peak decreased, the secondary pressure peak began to appear, the thickness of oil film increased, and the oil film necking became obvious gradually. When the entrainment speed continued to increase, the contact pair was in full film lubrication, the film thickness presented a typical horseshoe shape feature, and the contact pressure of rough peak approached 0. At this time, the total pressure was completely provided by the oil film pressure, the secondary pressure peak was obvious, the oil film thickness continued to increase, and the oil film necking further increased. With the adsorption film, the film thickness ratio decreased and the load ratio increased, in addition, the thicker the adsorption film, the smaller the film thickness ratio and the larger the load ratio, the lubrication state translated from mixed lubrication to boundary lubrication. It indicated that the presence of the adsorption film would increase the severity of contact, reduce the friction coefficient and has good anti-friction performance. © 2023 Science Press. All rights reserved.
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页码：561 / 571
页数：10
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