Indentation of a floating elastic sheet: geometry versus applied tension.

Box, F. and Vella, D. and Style, R. W. and Neufeld, J. A. (2017) Indentation of a floating elastic sheet: geometry versus applied tension. Proceedings of the Royal Society A:, 473. p. 20170335. ISSN 0962-8452 DOI https://doi.org/10.1098/rspa.2017.0335

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Official URL: https://www.ncbi.nlm.nih.gov/pubmed/29118662

Abstract

The localized loading of an elastic sheet floating on a liquid bath occurs at scales from a frog sitting on a lily pad to a volcano supported by the Earth's tectonic plates. The load is supported by a combination of the stresses within the sheet (which may include applied tensions from, for example, surface tension) and the hydrostatic pressure in the liquid. At the same time, the sheet deforms, and may wrinkle, because of the load. We study this problem in terms of the (relatively weak) applied tension and the indentation depth. For small indentation depths, we find that the force-indentation curve is linear with a stiffness that we characterize in terms of the applied tension and bending stiffness of the sheet. At larger indentations, the force-indentation curve becomes nonlinear and the sheet is subject to a wrinkling instability. We study this wrinkling instability close to the buckling threshold and calculate both the number of wrinkles at onset and the indentation depth at onset, comparing our theoretical results with experiments. Finally, we contrast our results with those previously reported for very thin, highly bendable membranes.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA70
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
07 - Gold Open Access
Journal or Publication Title: Proceedings of the Royal Society A:
Volume: 473
Page Range: p. 20170335
Identification Number: https://doi.org/10.1098/rspa.2017.0335
Depositing User: Sarah Humbert
Date Deposited: 09 Apr 2019 17:15
Last Modified: 09 Apr 2019 17:16
URI: http://eprints.esc.cam.ac.uk/id/eprint/4447

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