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Elastocapillary snapping: capillarity induces snap-through instabilities in small elastic beams
Aurélie Fargette1, Sébastien Neukirch2, Arnaud Antkowiak2
1Département de Physique, École Normale Supérieure, 24 rue Lhomond, 75005 Paris, France and CNRS, UMR 7190, Institut Jean Le Rond d'Alembert, F-75005 Paris, France and UPMC Université Paris 06, UMR 7190, Institut Jean Le Rond d'Alembert, F-75005 Paris, France.
Physical Review Letters
|April 22, 2014
Summary
Capillarity can cause thin elastic beams to snap suddenly. This elastocapillary instability, triggered by a water drop, can overcome gravity and be miniaturized for new applications.
Area of Science:
- Physics
- Materials Science
- Fluid Dynamics
Background:
- Elastic beams under buckling are susceptible to instabilities.
- Capillary forces play a significant role in microscale phenomena.
Purpose of the Study:
- To investigate the elastocapillary snap-through instability in elastic beams.
- To explore the triggering mechanisms and potential applications of this phenomenon.
Main Methods:
- Experimental observation of water drop-induced snapping on polymer strips.
- Theoretical analysis of the statics and dynamics of elastocapillary snapping.
- Demonstration of snapping against gravity and with soap bubbles on metal strips.
- Design of a miniaturized, condensation-induced version using steam flow.
Main Results:
- A millimeter-sized water drop can trigger snap-through instability in buckled polymer strips.
- The snapping phenomenon can counteract gravitational forces.
- The instability can be induced on centimeter-sized metal strips using soap bubbles.
- A miniaturized, condensation-driven experiment was successfully designed.
Conclusions:
- Elastocapillary snapping is a robust phenomenon driven by surface tension and elasticity.
- The instability is suitable for miniaturization and has potential for novel device designs.
- Condensation can be harnessed to induce elastocapillary snapping in microscale systems.
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