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Biomimetics 2016, 1(1), 7; doi:10.3390/biomimetics1010007

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

1
Department of Mechanical Engineering, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, UK
2
Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Bari 70126, Italy
3
Forschungszentrum Jülich, John von Neumann Institut für Computing and Jülich Supercomputing Centre, Institute for Advanced Simulation, 52425 Jülich, Germany
4
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)
View Full-Text   |   Download PDF [724 KB, uploaded 27 October 2016]   |  

Abstract

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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