Research on deformation property of end face asperity of contact mechanical seals
Wei Long1,2, Gu Boqin1, Feng Fei2, Feng Xiu2
(1.College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China; 2.Nanjing Engineering Research Center for Mechanical Seal, Nanjing College of Chemical Technology, Nanjing, Jiangsu 210048, China)
Taking account of the influence of friction, the deformation property of the end face asperity of contact mechanical seals was analyzed by fractal theory. The mathematical expressions of the critical elastic deformation micro-contact area, critical plastic deformation micro-contact area, elastic contact area between end- faces, elastic-plastic contact area, plastic contact area, and elastic contact area ratio, were obtained. The elaslic contact area ratio between the end faces of GY70 mechanical seal was also obtained by numerical simulation. Research results indicate that elaslic contact area ratio increases at first and then decreases with the increase of fractal dimension, decreases with the increasing of characteristic length scale, and decreases with the increasing of end-face friction factor. There exists an optimum fractal dimension for the contacting end-face of friction pair, corresponding to the maximum elaslic contact area ratio and minimum abrasion between the end faces of friction pair. The optimum fractal dimension of the soft ring end-face of GY70 mechanical seal fractal dimension is about 1.6.