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Two-field surface pattern control via marginally stable magnetorheological elastomers

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 two otherwise independent loading mechanisms–mechanical pre-compression and magnetic field–allows 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 the 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.
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Submitted on : Thursday, December 21, 2017 - 7:53:09 PM
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Erato Psarra, Laurence Bodelot, Kostas Danas. Two-field surface pattern control via marginally stable magnetorheological elastomers. Soft Matter, 2017, 13 (37), pp.6576 - 6584. ⟨10.1039/C7SM00996H⟩. ⟨hal-01627525⟩



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