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Issue 37, 2017
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Two-field surface pattern control via marginally stable magnetorheological elastomers

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Abstract

The stability and post-bifurcation of a non-linear magnetoelastic film/substrate block is experimentally exploited to obtain active control of surface roughness. The non-intuitive interplay between magnetic field and elastic deformation owes to material and geometry selection, namely a ferromagnetic particle composite film bonded on a compliant passive foundation. Cooperation of the two otherwise independent loading mechanisms-mechanical pre-compression and magnetic field-allows one to bring the structure near a marginally stable state and then destabilize it with either magnetic or mechanical fields. We demonstrate for the first time that the critical magnetic field is a decreasing function of pre-compression and vice versa. The experimental results are then probed successfully with full-field finite element simulations at large strains and magnetic fields. The magnetoelastic coupling allows for reversible on/off control of surface wrinkling under adjustable critical magnetic and mechanical fields, thus this study constitutes a first step towards realistic active haptic and morphing devices.

Graphical abstract: Two-field surface pattern control via marginally stable magnetorheological elastomers

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Supplementary files

Article information


Submitted
18 May 2017
Accepted
24 Aug 2017
First published
25 Aug 2017

Soft Matter, 2017,13, 6576-6584
Article type
Paper

Two-field surface pattern control via marginally stable magnetorheological elastomers

E. Psarra, L. Bodelot and K. Danas, Soft Matter, 2017, 13, 6576
DOI: 10.1039/C7SM00996H

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