Accueil > Séminaires > Précédents séminaires > Morphing soft structures with instabilities
Morphing soft structures with instabilities
Joël Marthelot Elasticity, Geometry and Statistics Laboratory, MIT, Cambridge
Fracture and buckling of slender structures are typically regarded as a first step towards failure. Instead, we envision mechanical instabilities in structures as opportunities for scalable, reversible, and robust mechanisms that are first to be predictively understood, and then harvested for function. I will first show how delamination and fracture cooperate in thin films leading to the propagation of robust fracture patterns that offer opportunities to use cracks as a tool to design surfaces at small scales. I will then focus on thin elastic shells to revisit the canonical mechanics problem of sensitivity of shell-buckling to geometric imperfections. Finally, I will move on to the post-buckling regime of shells where periodic dimpled patterns are observed when the shell is constrained from within by a rigid mandrel. We find that the geometry of the system is central in setting the surface morphology. This prominence of geometry suggests a scalable, and tunable mechanism for reversible shape-morphing of spherical shells.
Dans la même rubrique :
- Materials for Sustainable Growth : OrganoSulfur and Sulfur Hybrids
- Smart Dynamic Casting
- Effets Non-Additifs dans l’Adhésion ‘Mixte’ / Mouillage et Evaporation Simultanés des Liquides
- Le treuil capillaire, un concept attrapé dans les toiles d’araignées
- Scanning Probe Microscopy of (Complex) Polymeric Systems : Beyond Imaging their Morphology !
- Synthesis and Rheology of Hydrophobically Modified Poly(vinyl alcohol) using Gallic Acid derivatives.
- Polymer Gels and NMR spectroscopy
- Fracture patterns in a thin layer of cohesive granular matter
- Designing ion-containing polymers for facile ion transport
- Étude par AFM du rôle de l’eau dans les mécanismes de fracture lente des verres.
- Evaporation d’une huile légère émulsifiée dans un fluide à seuil
- Réseaux Interpénétrés de Polymères pour l’élaboration de dispositifs électriquement stimulables.
- Engineering the interface of nanocolloids with polymers
- Homogeneous bulk, surface, and edge nucleation in crystalline nanodroplets
- Some aspects of capillary forces
- Tracer diffusion of particles in gels
- Simulation d’écoulements diphasiques newtoniens, rhéofluidifiants ou viscoélastiques
- Colloidal particles at interfaces : from model systems for dynamical studies to applications.
- Assemblage spontané de polymères chargés et d’oxydes lamellaires en suspension aqueuse
- Ecoulements diphasiques à faible nombre capillaire dans des milieux hétérogènes.