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Biomimetics 2016, 1(1), 7;

A Green’s Function Molecular Dynamics Approach to the Mechanical Contact between Thin Elastic Sheets and Randomly Rough Surfaces

Department of Mechanical Engineering, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, UK
Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Bari 70126, Italy
Forschungszentrum Jülich, John von Neumann Institut für Computing and Jülich Supercomputing Centre, Institute for Advanced Simulation, 52425 Jülich, Germany
Department of Materials Science and Engineering, Saarland University, 66123 Saarbrücken, Germany
Author to whom correspondence should be addressed.
Academic Editor: Stanislav N. Gorb
Received: 19 April 2016 / Revised: 13 September 2016 / Accepted: 4 October 2016 / Published: 27 October 2016
(This article belongs to the Special Issue Micro- and Nano-Structured Bio-Inspired Surfaces)
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Adhesion of biological systems is often made possible through thin elastic layers, such as human skin. To address the question of when a layer is sufficiently thin to become adhesive, we extended Green’s function molecular dynamics (GFMD) to account for the finite thickness of an elastic body that is supported by a fluid foundation. We observed that thin layers can much better accommodate rough counterfaces than thick structures. As a result, the contact area is enlarged, in particular, when the width of the layer w approaches or even falls below the short-wavelength cutoff λ s of the surface spectra. In the latter case, the proportionality coefficient between area and load scales is ( w / λ s ) 3 , which is consistent with Persson’s contact mechanics theory. View Full-Text
Keywords: rough contact mechanics; thin layers; contact area rough contact mechanics; thin layers; contact area

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Putignano, C.; Dapp, W.B.; Müser, M.H. A Green’s Function Molecular Dynamics Approach to the Mechanical Contact between Thin Elastic Sheets and Randomly Rough Surfaces. Biomimetics 2016, 1, 7.

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