Drop-on-coilable-fibre systems exhibit negative stiffness events and transitions in coiling morphology.
Soft Matter
; 13(33): 5509-5517, 2017 Aug 23.
Article
in En
| MEDLINE
| ID: mdl-28744539
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.
Full text:
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Soft Matter
Year:
2017
Document type:
Article
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