This paper presents an analysis of the contact stresses and the contract area of mating disks in frictional transmission. Hertz’s formulations are adopted to determine the maximum contact stresses as well as the size of the contact area resulting from elastic deformation due to clamping force. Hertz’s formulations are expressed in terms of geometrical features of the active surface of mating disks. The obtained relationships can be readily applied for quantitative estimation of the contact stresses and the contact area parameters for different range of transmission ratio. Samples of numerical results are presented in graphical form.

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