Mixed rheologies in elastohydrodynamic lubrication

Industrial Lubrication and Tribology - 2004
Y.Zhang1
1Shanxi Institute of Technology, Taiyuan, Shanxi Province, People’s Republic of China

Tóm tắt

This paper studies elastohydrodynamic lubrication (EHL) of line contacts for the slide‐roll ratios 0‐2 based on the assumptions of interfacial shear strength and interfacial slip. It is shown that the viscoelastic, viscoplastic and non‐continuum fluids distribute from the inlet zone to the Hertzian contact zone in order for a given operating condition when the load and rolling speed exceed critical values. For the rolling speed below the critical, the distributing fluids from the inlet zone to the Hertzian contact zone in order are viscoelastic and non‐continuum when the load exceeds a critical value. These show a multirheological behavior EHL film, formed in a contact, which may represent a mode of mixed lubrication. For this mode of lubrication, the fluid model should handle both inlet and Hertzian contact zones where the fluids are, respectively, continuum and non‐continuum. A new EHL analysis and theory, therefore needs to be established.

Từ khóa


Tài liệu tham khảo

Bailey, M.W. and Cameron, A. (1973), “The effects of temperature and metal pairs on scuffing”, ASLE Trans., Vol. 16, p. 121.

Conry, T.F., Wang, S. and Cusano, C. (1987), “A Reynolds‐Eyring equation for elasto hydrodynamic lubrication in line contacts”, ASME J. of Trib., Vol. 109, pp. 648‐58.

Czichos, H. (1974), “Failure modes of sliding lubricated concentrated contacts”, Wear, Vol. 28, pp. 95‐101.

Czichos, H. and Kirschke, K. (1972), “Investigations into film failure (transition point) of lubricated concentrated contacts”, Wear, Vol. 22, pp. 321‐36.

Dowson, D. and Higginson, G.R. (1977), Elastohydrodynamic Lubrication, Pergamon Press, Oxford.

Ehret, P., Dowson, D. and Taylor, C.M. (1998), “On lubricant transport conditions in elastohydrodynamic conjunctions”, Proc. Roy. Soc. Lond., Vol. A454, pp. 763‐87.

Israelachvili, J. (1991), Intermolecular & Surface Forces, 2nd ed., Academic Press, Dublin.

Kaneta, M. and Nishikawa, H. (1992), “Effects of elastic moduli of contact surfaces in elastohydrodynamic lubrication”, ASME J. of Trib., Vol. 114, pp. 75‐80.

Kannel, J.W. and Bell, J.C. (1971), “Interpretations of the thickness of lubricant films in rolling contact: part I – examination of measurements obtained by X‐Rays”, ASME J. of Lubri. Tech., pp. 478‐84.

Murch, L. and Wilson, W.R.D. (1975), “A thermal elastohydrodynamic inlet zone analysis”, ASME J. of Lubri. Tech., pp. 212‐6.

Rozeanu, L. (1980), “Slippage phenomena at the interface between the absorbed layer and the bulk of the lubricant: theory and experiment”, Wear, Vol. 64, pp. 245‐57.

Rozeanu, L. and Snarsky, L. (1978), “Effect of solid surface lubricant interaction on the load carrying capacity of sliding bearings”, ASME J. of Lubri. Tech., Vol. 100, pp. 167‐75.

Salomon, G. (1976), “Failure criteria in thin film lubrication‐ the IRG program”, Wear, Vol. 36, pp. 1‐6.

Sharma, J. and Cameron, A. (1973), “Surface roughness and load in boundary lubrication”, ASLE Trans., Vol. 16 No. 4, pp. 258‐66.

Zhang, Y. (n.d), “Prevention of film slippage in pure rolling line contact elastohydrodynamic lubrication at heavy loads”, Proc. Instn. Mech. Engrs., Part J‐ Engineering Tribology.

Zhang, Y. and Wen, S. (2000), “EHL performance of the lubricant with shear strength: part i – boundary slippage and film failure”, Trib. Trans., Vol. 43, pp. 700‐10.

Zhang, Y. and Wen, S. (2001a), “A lubrication deviation from the classical EHL theory by the lubricant viscoplasticity: part I – film thickness dependence”, Trib. Trans., Vol. 44, pp. 224‐32.

Zhang, Y. and Wen, S. (2001b), “A lubrication deviation from the classical EHL theory by the lubricant viscoplasticity: part II – boundary of lubrication regimes”, Trib. Trans., Vol. 44, pp. 305‐9.

Zhang, Y. and Wen, S. (2002a), “An analysis of elastohydrodynamic lubrication with limiting shear stress: part I – theory and solutions”, Trib. Trans., Vol. 45, pp. 135‐44.

Zhang, Y. and Wen, S. (2002b), “An analysis of elastohydrodynamic lubrication with limiting shear stress: part II – load influence”, Trib. Trans., Vol. 45, pp. 211‐6.

Zhang, Y. and Wen, S. (2002c), “EHL film thickness limitation theory under a limiting shear stress”, Trib. Trans., Vol. 45, pp. 531‐9.

Zhang, Y., Wen, S. and Wei, D.P. (2001), “About the load‐carrying capacity of elastohydrodynamic lubrication film”, Trib. Trans., Vol. 44, pp. 1‐10.

Thông tin
Thông tin xuất bản

Industrial Lubrication and Tribology

Thông tin tác giả