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Issue 33, 2017
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Drop-on-coilable-fibre systems exhibit negative stiffness events and transitions in coiling morphology

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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 detail and find theoretical, numerical and experimental evidence 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.

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

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Article information


Submitted
21 Feb 2017
Accepted
09 Jul 2017
First published
10 Jul 2017

Soft Matter, 2017,13, 5509-5517
Article type
Paper

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, 13, 5509
DOI: 10.1039/C7SM00368D

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