The thermal mixed lubrication model of finite-length line contacts is established, which takes account of the elasto-plastic deformation of the asperities and boundary-film tribo-chemistry properties.The model is verified by comparing the infinite-length theoretical model, the elastohydrodynamic lubrication (EHL) test rig and double-disk experimental data.Then the effect of surface roughness and the lubricant properties on the lubrication and friction are preliminarily discussed. The results show that reducing the surfuce roughness can effectively improve the scuffing resistance under the current operating conditions.
WANG Zhijian,CHEN Xiaoyang,SHEN Xuejin
. A Mixed EHL Model of Finite-Length Line Contact Considering Asperity
Elasto-Plastic Deformation and the Lubricant Properties[J]. Journal of Shanghai Jiaotong University, 2018
, 52(5)
: 525
-532
.
DOI: 10.16183/j.cnki.jsjtu.2018.05.004
［1］JOHNSON K L, GREENWOOD J A, POON S Y. A simple theory of asperity contact in elasto-hydrodynamic lubrication［J］. Wear, 1972, 19(1): 91-108.
［2］GREENWOOD J A, WILLIAMSON J B P. Contact of nominally flat surfaces［J］. Proceedings of the Royal Society A, 1966, 295(1442): 300-319.
［3］PATIR N, CHENG H S. An average flow model for determining effects of three-dimensional roughness on partial hydrodynamic lubrication［J］. Journal of Lubrication Technology, 1978, 100(1): 12-17.
［4］ZHAO Y, MAIETTA D M, CHANG L. An asperity micro-contact model incorporating the transition from elastic deformation to fully plastic flow［J］. Journal of Tribology, 2000, 122(1): 86-93.
［5］MASJEDI M, KHONSARI M M. Film thickness and asperity load formulas for line-contact elasto-hydrodynamic lubrication with provision for surface roughness［J］. Journal of Tribology, 2012, 134(1): 011503-1-10.
［6］BOWDEN F P, TABOR D, PALMER F. The friction and lubrication of solids［M］. Oxford: Clarendon Press, 1954.
［7］ROELANDS C J A. Correlation aspects of the viscosity-temperature-pressure relationship of lubricating oils［D］. Delft, Netherlands: Technische Hogeschool Delft, 1966.
［8］DOWSON D, HIGGINSON G R. Elasto-hydrodynamic lubrication［M］. Oxford: Pergamon Press, 1977.
［9］MCCOOL J I. Relating profile instrument measurements to the functional performance of rough surfaces［J］. Journal of Tribology, 1987, 109(2): 264-270.
［10］HIRST W, HOLLANDER A E. Surface finish and damage in sliding［J］. Proceedings of the Royal Society A, 1974, 337(1610): 379-394.
［11］CHANG L, JENG Y R. A mathematical model for the mixed lubrication of non-conformable contacts with asperity friction, plastic deformation, flash temperature, and tribo-chemistry［J］. Journal of Tribology, 2014, 136(2): 022301-1-9.
［12］TIAN X F, KENNEDY F E. Maximum and average flash temperatures in sliding contacts［J］. Journal of Tribology, 1994, 116(1): 167-174.
［13］CHIPPA S P, SARANGI M. Study of surface roughness effects in elastohydrodynamic lubrication of a finite line contact using probabilistic model［C］∥Proceedings of the 1st International and 16th National Conference on Machines and Mechanisms. Roorkee, India: Indian Institute of Technology, 2013: 857-863.
［14］JACKSON A, WEBSTER M N, ENTHOVEN J C. The effect of lubricant traction on scuffing［J］. Tribology Transactions, 1994, 37(2): 387-395.
