Fractal Model of the Tangential Contact Stiffness of Machined Surfaces in Contact
Zhang Xueliang(1),Wen Shuhua(1),Xu Gening(1),Ni Runtang(2)
(1 Taiyuan Heavy Machinery Institute, Taiyuan 030024)
(2 Datong, Xin'gaoshan Coal-Transportation Company, Datong 037001)

Abstract: Under three given hypotheses: (1) the micro-profile of rough surfaces is isotropic£»(2) the interactions between neighboring asperities of rough surfaces can be ignored£»(3) the force applied on each asperity at rough surfaces is directly proportional to its contact area, a fractal model of the tangential contact stiffness of machined surfaces in contact is built up based on the tangential contact stiffness between a sphere and a plane and the contact fractal theory of rough surfaces, at the first time in the paper. The simulating results of this model are identical qualitatively with the experimental results made by certain previous researchers. So it shows that this model is reasonable. This model is independent with scale.
Keywords: machined surfaces in contact, tangential contact stiffness, fractal model.