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Abstract
The contact of two surfaces in relative rotating motion occurs in many practical applications, from mechanical devices to human joints, displaying an intriguing interplay of effects at the onset of sliding due to the axisymmetric stress distribution. Theoretical and numerical models have been developed for some typical configurations, but work remains to be done to understand how to modify the emergent friction properties in this configuration. In this paper, we extend the two-dimensional (2D) spring-block model to investigate friction between surfaces in torsional contact. We investigate how the model describes the behavior of an elastic surface slowly rotating over a rigid substrate, comparing results with analytical calculations based on energy conservation. We show that an appropriate grading of the tribological properties of the surface can be used to avoid a non-uniform transition to sliding due to the axisymmetric configuration.
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Details
1 École Polytechnique Fédérale de Lausanne, Civil Engineering Institute, Lausanne, Switzerland (GRID:grid.5333.6) (ISNI:0000000121839049)
2 Politecnico di Torino, Department of Applied Science and Technology, Torino, Italy (GRID:grid.4800.c) (ISNI:0000 0004 1937 0343)
3 University of Trento, Laboratory for Bioinspired, Bionic, Nano, Meta Materials & Mechanics, Department of Civil, Environmental and Mechanical Engineering, Trento, Italy (GRID:grid.11696.39) (ISNI:0000 0004 1937 0351); Queen Mary University of London, School of Engineering and Materials Science, London, UK (GRID:grid.4868.2) (ISNI:0000 0001 2171 1133)