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Drop-on-coilable-fibre systems exhibit negative stiffness events and transitions in coiling morphology

Abstract

We investigate the mechanics of elastic fibres carrying liquid droplets. In such systems, buckling may localize inside the drop cavity if the fibre is thin enough. This so-called drop-on-coilable-fibre system exhibits a surprising liquid-like response under compression, and a solid-like response under tension. Here we analyze this unconventional behavior in further details and find theoretical, numerical and experimental evidences of negative stiffness events. We find that the first and main negative stiffness regime owes its existence to the transfer of capillary-stored energy into mechanical curvature energy. The following negative stiffness events are associated with changes in the coiling morphology of the fibre. Eventually coiling becomes tightly locked into an ordered phase where liquid and solid deformations coexist.

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Publication details

The article was received on 21 Feb 2017, accepted on 09 Jul 2017 and first published on 10 Jul 2017


Article type: Paper
DOI: 10.1039/C7SM00368D
Citation: Soft Matter, 2017, Accepted Manuscript
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    Drop-on-coilable-fibre systems exhibit negative stiffness events and transitions in coiling morphology

    H. Elettro, F. Vollrath, A. Antkowiak and S. Neukirch, Soft Matter, 2017, Accepted Manuscript , DOI: 10.1039/C7SM00368D

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