Sommaire:

Optical and acoustical metamaterials take advantage of resonances. Here, we create mechanical metamaterials by exploiting elastic instabilities. Namely, we exploit buckling of the micro-structure to create materials with transnatural mechanical properties. We use Finite Element simulations, 3D printing, mechanical tests and high resolution imaging to optimize, make and study their mechanical response. I will show several examples of metamaterials in 1D (metabeams), 2D (holey sheets) and 3D (buckli-cube), that have an incredibly rich phenomenology: auxetic behavior, negative stiffness, elastic memory, collective effects. I will show that the symmetries of the micro-structure and the presence of elastic nonlinearities are crucial to understand, to model and to tune the mechanics of such systems. This paves the way towards the rational design of a new generation of materials, with extreme mechanics and enhanced functionality.

Pour plus d'informations, merci de contacter Berthier L.