Associated rules between microstructure characterization parameters and contact characteristic parameters of two cylinders

ZHOU Wei(周炜)^{1, 2}, TANG Jin-yuan(唐进元)^{1, 2}, HE Yan-fei(何艳飞)^{1, 2}, LIAO Dong-ri(廖东日)^{1, 2}

(1. State Key Laboratory of High Performance Complex Manufacturing (Central South University),
Changsha 410083, China;
2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China)

Abstract:The contact strength calculation of two curved rough surfaces is a forefront issue of Hertz contact theory and method. Associated rules between rough surface characterization parameters (correlation length, and root mean square deviation) and contact characteristic parameters (contact area, maximum contact pressure, contact number, and contact width) of two rough cylinders are mainly studied. The contact model of rough cylinders is deduced based on GW model. As there is no analytical solution for the pressure distribution equation, an approximate iterative solution method for the pressure distribution is adopted. Furthermore, the quantitative relationships among the correlation length, the root mean square deviation, the asperity radius of curvature and the asperity density are also obtained based on a numerical simulation method. The maximum contact pressure and the contact number decrease with the increase of correlation length, while the contact width and the contact area are on the contrary. The contact width increases with the increase of root mean square deviation while the maximum contact pressure, the contact area and the contact number decrease.

Key words:rough surface; cylinder; contact; correlation length; root mean square deviation