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PMMH’s weekly seminar is held every Friday at 11 am (map)
Alice Pelosse
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH – Émilien Dilly (LiPhy, Grenoble)
Metabeams with programmable nonlinear bending response
Recent advances in mesoscale material architecture have enabled the design of structures exhibiting nonclassical mechanical responses, including auxetic behavior, mode coupling (e.g., stretching–bending and stretching–twisting), and exceptional stiffness-to-weight ratios. Inspired by the nonlinear bending response of a carpenter's measuring tape and the pronounced drooping of U-shaped plant petioles under water stress, we investigate the bending behavior of rectangular beams decorated with one or more longitudinal vertical fins.
During bending, longitudinal stretching of the fins couples to the beam curvature, inducing transverse compression within the fins. Beyond a critical curvature, this compression triggers fin buckling, which we rationalize in terms of the governing geometric parameters. Fin buckling leads to an abrupt reduction of the beam's effective moment of inertia, giving rise to a non-monotonic moment–curvature relationship closely analogous to that observed in carpenter's tapes.
By incorporating pillars that engage only beyond a prescribed curvature, we introduce curvature-dependent mechanical hardening. When combined with the fins, this strategy enables the programming of rich, highly tunable, and non-monotonic torque–curvature responses. An inverse design framework is developed to achieve on-demand torque profiles and is validated experimentally.
Exploiting this complex torque response, we further show that embedding fin-decorated beams into pneumatic bending actuators induces a snap-through instability, resulting in rapid actuation and a hysteretic mechanical response. This behavior enables fast, programmable motion.
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Seminars (6)
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Séminaire PMMH – Cédric Beaume (U. Leeds)
Vendredi 20 mars de 11h00 à 12h00 - Salle réunion PMMH 1
A fluid instability at the origin of salt polygons
Dry salt lakes form spectacular landscapes in arid regions. Strong evaporation and weak precipitation (but also human intervention) can progressively deplete lakes of water, leaving surfaces that appear dry while the water table remains shallow. In such environments, evaporation continues to play an important role, (…) -
Séminaire PMMH – Philippe Beltrame (U. Avignon)
Vendredi 27 mars de 11h00 à 12h00 - Salle réunion PMMH 1
Ratchet Effect for Selective Transport of Microparticles in Fluid Suspension
The ratchet effect enables directed transport of particles in noisy systems, even in the absence of a net force (zero bias). When exploited in periodic structures, this phenomenon paves the way for innovative applications in selective microparticle sorting. This seminar will present a theoretical analysis of (…) -
Séminaire PMMH – Jonas Miguet (MSC, Univ. Paris Cité)
Vendredi 3 avril de 11h00 à 12h00 - Salle réunion PMMH 1
Antibubbles : optical interferometry, gas transfers and acoustic signature
An antibubble is a spherical thin film of gas, that encapsulates a droplet, within a liquid medium. The typical size of an antibubble is one centimeter while the thickness of the gas film is of micrometric order. Because of the higher hydrostatic pressure at the bottom, the gas film undergoes a (…) -
Séminaire PMMH – Gautier Verhille (IRPHÉ)
Vendredi 10 avril de 11h00 à 12h00 - Salle réunion PMMH 1
Formation and fragmentation of fiber aggregate in turbulent flows
Fiber aggregates are commonly encountered in environmental and industrial flows (paper industry, fiber recycling, etc.). However, the physical mechanisms leading to their formation are still misunderstood. Hence, there is still no clear answer to simple questions such as : how long will it take for an aggregate to (…) -
Séminaire PMMH – Nicolas Roméo (James Franck Institute, Chicago)
Vendredi 17 avril de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Pas de séminaire
Vendredi 24 avril de 11h00 à 12h00 - Salle réunion PMMH 1
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
