Normal contact stiffness of machine joint surfaces under mixed lubrication state

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (3) : 16-23.

LI Ling, PEI Xiyong, SHI Xiaohui, LI Zhiqiang, CAI Anjiang

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Abstract

Aiming at the problem of contact characteristics of machine joint surfaces being affected by oil film under lubrication conditions, based on the idea of a joint surface’s contact stiffness consisting of oil film contact stiffness and solid surface contact stiffness, the joint surface’s normal contact stiffness model was established under mixed lubrication state.The 3-D Weierstrass-Mandelbrot function was used to obtain a rough surface with fractal feature to build a joint surface’s normal contact stiffness model under dry friction condition using the statistics method and considering a micro-convex body’s full elastic deformation process, elastoplastic one and full plastic one.Furthermore, the equivalent thickness of an oil film was solved and its contact stiffness model was built.The results showed that a joint surface’s contact stiffness increases with increase in normal load; a joint surface’s contact stiffness under mixed lubrication state is larger than that under dry friction condition; the proposed model avoids the problem of measuring oil film’s thickness being difficult and provides a help for predicting lubrication state of mechanical structures.

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machine joint surface / mixed lubrication / equivalent thickness / normal contact stiffness / fractal theory

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LI Ling, PEI Xiyong, SHI Xiaohui, LI Zhiqiang, CAI Anjiang. Normal contact stiffness of machine joint surfaces under mixed lubrication state[J]. Journal of Vibration and Shock, 2020, 39(3): 16-23

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