Fractal Prediction Model for Tangential Contact Damping of Joint Surface Considering Friction Factors and Its Simulation

In order to accurately consider the influence of micro-morphology on the joint surface,the "solid-gap-solid" contact model of joint surface is proposed.The fractal prediction model of the tangential contact damping of joint surface is established based on the "solid-gap-solid" contact model,contact fractal theory and the Hertz theory.And the influence of relevant parameters on the tangential contact damping is revealed with the research of numerical simulation.All the work provides the preparation for follow-up dynamic modeling and dynamic analysis of joint surface.Simulation results show that tangential contact damping of joint surface increases with the increase of real contact area,reduces with the increase of normal load of joint surface and tends to be constant with the increase of friction coefficient between the joint surfaces.Real contact area influences the location of the turning point of the cte*-μ(critical friction coefficient μc).With the increase of the real contact area,critical friction coefficient μc increases at the same time.Big differences exist between the contact behaviors with the different fractal dimension values,especially on both sides of the fractal dimension critical value(D=1.55).