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Study of matter at extreme conditions using laser-generated shock-waves
Lundi 6 février 2017 14:00 - Duree : 1 heureLieu : Conference room - LIPhy - Bât E - 140 Avenue de la Physique - St Martin d’Hères. Accès par interphone, appeler le secrétariat
Orateur : Aurélie HOURLIER-FARGETTE (Institut Jean Le Rond d’Alembert, UPMC, Paris - Département de Physique, Ecole Normale Supérieure, Paris)
The role of surface tension in the mechanics of deformable solids is a question raising a growing interest in the soft matter community : in this context, I will present two examples of instabilities featuring liquids on soft materials. We will begin by revisiting the snap-through instability from an elastocapillary point of view. Snap-through, present in systems ranging from carnivorous plants to MEMS, is a well-known phenomenon in solid mechanics. Here we show that capillary forces are strong enough to trigger a snap-through instability at small scales, and even counterbalance gravity for a droplet deposited below a downward buckled elastic strip. We investigate the statics and dynamics of this phenomenon, and compare droplet-induced snap-through to dry point force indentation on a buckled thin strip. In a second part, we will focus on the dynamics of droplets sliding on elastomers. The motion of droplets on stiff surfaces has been investigated for a long time, while recent studies have shown the interesting physics underlying the sliding of droplets on soft surfaces. We focus on the dynamics of water-glycerol mixture droplets sliding down vertical plates of commercial silicone elastomers, highlighting an unexpected behavior : the droplet dynamics on such a surface includes two regimes with different constant speeds. Our experiments reveal an unexpected link between microscopic phenomena at the scale of the polymer matrix and the macroscopic dynamics of a droplet.
Entité organisatrice : (LIPhy)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire Mat. Molle/grise)
Site de l'évènement : Domaine Universitaire de St Martin d’Hères
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