Friction-induced energy losses in mechanical contacts subject to random vibrations

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DOI Доступ к ресурсу на сайте издателя			10.1016/j.ijsolstr.2019.10.026

Title: Friction-induced energy losses in mechanical contacts subject to random vibrations
Creator: Aleshin, Vladislav V.
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Papangelo, Antonio
Date: 2020
DOI: 10.1016/j.ijsolstr.2019.10.026
Description: In this paper, we apply the previously developed Method of Memory Diagrams (MMD) to the description of an axisymmetric mechanical contact with friction subject to random vibrations. The MMD belongs to a family of semi-analytical methods of contact mechanics originating from the classical Cattaneo–Mindlin solution; it allows one to efficiently compute mechanical and energetic responses to complex excitation signals such as random or acoustic ones. For an axisymmetric contact driven by random normal and tan- gential displacements having fractal statistical properties, we calculate the friction-induced mechanical energy loss averaged over a large number of realizations. In the considered problem, this energy depends on a very restrained number of parameters: on the rms of random displacements, on the fractal dimen- sion, and on the upper cut-offfrequency of the fractal spectrum. In addition, a radial distribution of the dissipated energy has been obtained that has a direct relation to wear in the contact system. For small displacement amplitudes, wear should be expected in an annulus inside of a mean contact circle whereas for large displacements it will start at the contact center.