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Elastic stabilization of wrinkles in thin films by auxetic microstructure

Elastic stabilization of wrinkles in thin films by auxetic microstructure
Elastic stabilization of wrinkles in thin films by auxetic microstructure

Thin elastic sheets and membranes are known to wrinkle when they are stretched — the associated physics is highly non-linear. The unusual behavior exhibited by thin films upon stretching when they possess auxetic structure, i.e. when their apparent Poisson's ratio is negative, is reported here. Wrinkling is now suppressed within the bulk of auxetic films when tensioned, whereas localized creases confined to the clamps, which decay away exponentially, appear. These edge wrinkles are characterized for their amplitude and wavelength experimentally, theoretically, and computationally, which show excellent agreement with expected trends. The scaling for amplitude, wavelength and decay rate upon film properties and tension is obtained using simple analyses based on kinematic mismatch resulting from lateral Poisson's expansion.

Auxetic films, Membrane elasticity, Wrinkling
Bonfanti, Alessandra
61f52944-226a-4078-8e50-88036bf85dc8
Bhaskar, Atul
d4122e7c-5bf3-415f-9846-5b0fed645f3e
Bonfanti, Alessandra
61f52944-226a-4078-8e50-88036bf85dc8
Bhaskar, Atul
d4122e7c-5bf3-415f-9846-5b0fed645f3e

Bonfanti, Alessandra and Bhaskar, Atul (2019) Elastic stabilization of wrinkles in thin films by auxetic microstructure. Extreme Mechanics Letters, 33, [100556]. (doi:10.1016/j.eml.2019.100556).

Record type: Article

Abstract

Thin elastic sheets and membranes are known to wrinkle when they are stretched — the associated physics is highly non-linear. The unusual behavior exhibited by thin films upon stretching when they possess auxetic structure, i.e. when their apparent Poisson's ratio is negative, is reported here. Wrinkling is now suppressed within the bulk of auxetic films when tensioned, whereas localized creases confined to the clamps, which decay away exponentially, appear. These edge wrinkles are characterized for their amplitude and wavelength experimentally, theoretically, and computationally, which show excellent agreement with expected trends. The scaling for amplitude, wavelength and decay rate upon film properties and tension is obtained using simple analyses based on kinematic mismatch resulting from lateral Poisson's expansion.

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More information

Accepted/In Press date: 9 September 2019
e-pub ahead of print date: 1 October 2019
Published date: 1 November 2019
Keywords: Auxetic films, Membrane elasticity, Wrinkling

Identifiers

Local EPrints ID: 437144
URI: http://eprints.soton.ac.uk/id/eprint/437144
PURE UUID: f163b1ae-7c6d-4775-80b1-902896c51ffa

Catalogue record

Date deposited: 17 Jan 2020 17:36
Last modified: 25 Nov 2021 19:49

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Contributors

Author: Alessandra Bonfanti
Author: Atul Bhaskar

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