关键词: 固定结合面, 切向接触刚度, 通用性模型, 分形理论

Abstract: To reflect the dynamic features of fixed joint interfaces,a universal model of tangential contact stiffness for joint interfaces was put forward by using fractal theory,which was assumed by a flat rigid surface and a deformed rough counter-surface and in contact with the elastic half-space.The numerical simulation results indicated that the fixed joint interfaces tangential contact stiffness was increased with normal load increasing.The nonlinear and linear relationships were existed between the fixed joint interfaces tangential contact stiffness and normal load when 1<D<1.5 and 1.5≤D<2 respectively.The fixed joint interfaces tangential contact stiffness was increased with fractal dimension increasing when 1<D≤1.7.However,the fixed joint interfaces tangential contact stiffness was decreased with fractal dimension increasing when 1.7<D<2.When the fractal dimension was constant (1<D<2),the fixed joint interfaces tangential contact stiffness was increased with fractal roughness parameter decreasing.

Key words: fixed joint interfaces, tangential contact stiffness, universal model, fractal theory