To research the dynamic characteristics of the joint surfaces from the microperspective, the fractal prediction model of the normal contact damping of joint surfaces is established based on the "solid-gap-solid" contact model which was proposed by the author, tribology theory, and contact fractal theory. And the kinetic model of joint surfaces is improved to a certain extent. The influences of actual contacting area, friction coefficient, and the fractal dimension on the normal contact damping are revealed by the research of numerical simulation. Simulation results show that the normal contact damping of joint surfaces decreases to a constant value with the increase of actual contacting area, increases with the increase of friction coefficient, and decreases with the increase of fractal dimension. Actual contacting area influences the location of the turning point of the * -(critical friction coefficient), and the critical friction coefficient increases with the increase of actual contacting area. Normal damping coefficient of joint surfaces continuously decreases with the increase of fractal dimension and the difference of magnitude exists between normal contact damping coefficients with different fractal dimension values.
Dehua Sun (2015): Dynamic characteristics of cylinders' joint surfaces considering friction and elastic-plastic deformation based on fractal theory, Australian Journal of Mechanical Engineering To link to this article: http://dx.
ABSTRACTIn order to understand the situation of cylinder deformation, M-B fractal model was modified and utilized. The deformation of cylinder was studied, separately at elastic stage, elastic-plastic stage and plasticity stage. From the combination of macro and micro perspective, the fractal model in the contact stiffness of the two-cylinder binding surface was established considering the influence of friction. It proved to be feasible by numerical simulation. Moreover, the dynamic model was established through spring element method, and the first four natural frequencies of the optical axis stents were obtained through the finite element analysis method. Finally, the natural frequencies and modal shapes obtained from theoretical analysis and experiment were compared. The results show that the established stiffness model gives reliable results. This means that a novel approach for studying the combination of surfaces is provided.
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