Home page > Séminaires > Séminaire des doctorants > Mercredi 9 mars 2016 : Etienne Jambon-Puillet (d’Alembert, UPMC ; Paris). "Fold formation in compressed granular rafts"..
Mercredi 9 mars 2016 : Etienne Jambon-Puillet (d’Alembert, UPMC ; Paris). "Fold formation in compressed granular rafts".
Sauf mention contraire, les séminaires et les soutenances se déroulent à 11h30 en salle 454A du bâtiment Condorcet.
"Fold formation in compressed granular rafts".
Etienne Jambon-Puillet (Institut Jean Le Rond d’Alembert, Université Pierre et Marie Curie ; Paris).
Wrinkles and folds occur in a wide variety of situations, we find them in Nature but also in man-made products. They typically appear when a thin sheet bound to a foundation is compressed. Here we demonstrate that particle ladden interfaces, despite being made of discrete very hard particles, can form wrinkles and folds like a soft elastic solid. We call granular raft a close packed monolayer of heavy, athermal particles at the interface between two fluids. We use beads of different materials with diameters ranging from 30 um to 0.8 mm dispersed at a planar oil/water interface. Upon uniaxial compression the raft buckles out of plane like a soft elastic solid and forms a periodic wrinkling pattern, then the deformation localizes in a large unique fold/crease. This behavior is reminiscent of a compressed elastic sheet floating on water. We will highlight similarities and differences between the mechanical properties of our discrete heavy granular raft and a continuous elastic floating film. Finally we will show how elasticity and gravity contribute to rationalize the original shape of the fold we observe.
Mercredi 9 mars, 17h30, 646A.
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Contact : Équipe séminaires / Seminar team - Published on / Publié le 7 mars 2016
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