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Lubricants 2018, 6(2), 51; https://doi.org/10.3390/lubricants6020051

The Fundamental Regularities of the Evolution of Elastic Vortices Generated in the Surface Layers of Solids under Tangential Contact Loading

Laboratory of Computer-Aided Design of Materials, Institute of Strength Physics and Materials Science SB RAS, pr. Akademicheskii 2/4., Tomsk 634055, Russia
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Received: 12 April 2018 / Revised: 12 May 2018 / Accepted: 16 May 2018 / Published: 18 May 2018
(This article belongs to the Special Issue Computer Simulation in Tribology and Friction)
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Abstract

Conventionally discussed dynamic mechanisms of elastic strain energy redistribution in near-contact surface regions include P and S elastic wave pulses radiating from the contact surface. At the same time, the elastic strain energy can be transferred by localized vortex-like elastic waves (Rayleigh, Love, Stoneley wave, and so on). In the paper, we numerically studied the main features of the formation and propagation of localized vortex-like waves in the surface layers under the contact zone. The study was done using the numerical method of movable cellular automata. We showed that the initial phase of dynamic contact interaction with a nonzero tangential component of contact velocity is accompanied by the formation of a so-called elastic vortex. The elastic vortex is a fully dynamic object, which is characterized by shear stress concentration and propagates at the shear wave speed. We first revealed the ability of the elastic vortex to propagate toward the bulk of the material and transfer elastic strain energy deep into the surface layer in a localized manner. We analyzed the dependence of the direction of vortex propagation on the tangential contact velocity, contact pressure and Young’s modulus of the material. The results of the study are important for better understanding the dynamic mechanisms contributing to inelastic strain accumulation or gradual degradation of surface layers. View Full-Text
Keywords: contact interaction; dynamics; elastic wave; elastic vortex; stress concentration; modeling; discrete element method contact interaction; dynamics; elastic wave; elastic vortex; stress concentration; modeling; discrete element method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shilko, E.V.; Astafurov, S.V.; Grigoriev, A.S.; Smolin, A.Y.; Psakhie, S.G. The Fundamental Regularities of the Evolution of Elastic Vortices Generated in the Surface Layers of Solids under Tangential Contact Loading. Lubricants 2018, 6, 51.

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