1. College of Mechanical and Material Engineering, China Three Gorges University, Yichang 443002, China;2. Hubei Key Laboratory of Hydroelectric Machinery Design and Maintenance, China Three Gorges University, Yichang 443002, China
Abstract：The fractal geometric theory was modified. The improved fractal models for normal load, maximal static friction force and static friction coefficient were established using improved fractal geometric theory. According to the middle unknown variable of real contact area, the prediction model of static tribological performance for metallic material joint surface was given. The calculation and analysis above indicate that static friction coefficient micro concavely increases as normal load or material property increases, while it micro concavely decreases with increasing fractal roughness. When fractal dimension is smaller, the static friction coefficient increases as fractal dimension increases; however, when fractal dimension becomes larger, the static friction coefficient decreases as fractal dimension increases. The maximum static friction force mostly is linearly proportional to the normal load on a common logarithm reference frame. The fractal geometric theory could be applied under small normal load condition.
2013, Vol. 32 
