MENG Fan-jing, LIU Hua-bo, HUA Shao-zhen. MECHANICAL MECHANISM OF INFLUENCE OF INTER-GRANULAR FRICTION ON GRANULAR LUBRICATION[J]. Engineering Mechanics, 2021, 38(4): 221-229, 246. DOI: 10.6052/j.issn.1000-4750.2020.05.0341
Citation: MENG Fan-jing, LIU Hua-bo, HUA Shao-zhen. MECHANICAL MECHANISM OF INFLUENCE OF INTER-GRANULAR FRICTION ON GRANULAR LUBRICATION[J]. Engineering Mechanics, 2021, 38(4): 221-229, 246. DOI: 10.6052/j.issn.1000-4750.2020.05.0341

MECHANICAL MECHANISM OF INFLUENCE OF INTER-GRANULAR FRICTION ON GRANULAR LUBRICATION

  • Granular lubrication is a new type of lubrication method which can be used in harsh working conditions. The law and characteristics of the effect of friction between particles on granular lubrication are the key scientific issues to clarify the theory of granular lubrication. On the other hand, it can also provide technical support for the design and parameter selection of granular lubricated bearing under extreme conditions. In order to analyze the influence of the friction between granules on the macro and micro characteristics of the granular lubrication system as well as the friction between the lower friction pair and the granular lubrication medium, a discrete element numerical model of the granular lubrication is constructed, and the above problems are analyzed and studied. The results show that the inter-granular friction has a significant effect on the antifriction lubrication characteristics of a granular lubrication system. The mean friction coefficient between the lower friction pair and the granules increases with the increased inter-granular friction coefficient. The coordination number and the sliding fraction in the granular lubrication system increase with the decrease of the inter-granular friction coefficient. The macroscopic flow behavior of the granular lubrication medium in the friction pair gap has obvious stratification characteristics, and the macroscopic flow velocity of granules decreases with the increase of the inter-granular friction coefficient. Further analysis results show that the fluctuation of granular lubrication medium is the key parameter directly reflecting the macroscopic flow speed of granules.
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