A calculation model for the normal contact stiffness of rough surface in mixed lubrication

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (24) : 106-114.

XIAO Huifang1,2，SUN Yunyun1，XU Jinwu1，SHAO Yimin3

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Abstract

The normal contact stiffness is an essential parameter for describing the interface characteristics and exhibits significant influence on both the static and dynamic behavior of the mechanical system.In this work, a general contact stiffness model was proposed to study the mixed lubricated contact for rough surface contact.The total interfacial contact stiffness was composed of the dry rough surface contact stiffness and the liquid lubricant contact stiffness.The Greenwood-Williamson model was used for surface topography description and the whole dry rough contact stiffness was obtained.The liquid film stiffness was derived based on the film resonance model and the spring model spring model.Effects of surface roughness, property of lubricant layer and property of contact solid on the normal contact stiffness were analyzed.Results show that the acoustic impedance is the main factor determining the liquid film stiffness and the liquid film stiffness decreases with acoustic impedance.The surface topography and elastic modulus are the main factor determining the solid contact stiffness.The proposed calculation model for normal contact stiffness of rough surface in mixed lubrication provides foundation for stiffness calculation, performance predication and optimization of mechanical structure.

Key words

Mixed lubrication / Rough surface / Solid contact stiffness / Liquid film stiffness

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XIAO Huifang1,2，SUN Yunyun1，XU Jinwu1，SHAO Yimin3. A calculation model for the normal contact stiffness of rough surface in mixed lubrication[J]. Journal of Vibration and Shock, 2018, 37(24): 106-114

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