March 22, 1989 - March 22, 2022

  • Date:14ThursdayJune 2018

    Making Faces: Universal Inverse Design of Surfaces with Anisotropic Soft Materials

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    11:15 - 12:30
    Edna and K.B. Weissman Building of Physical Sciences
    Hillel Aharoni
    University of Pennsylvania
    Faculty of Physics
    DetailsShow full text description of 11:00 Coffee, Tea and more ...»
    11:00 Coffee, Tea and more
    AbstractShow full text abstract about Elastic bodies can be programmed to take different shapes in...»
    Elastic bodies can be programmed to take different shapes in different environments using stimulus-responsive anisotropic materials, where the route of shape changes is encoded in the local direction of material anisotropy at every point. In this talk I tackle the key theoretical question underlying many recent efforts to implement this approach — the inverse design problem — namely, given an arbitrary shape, constructing the anisotropy field that would induce it. I show analytical solutions to certain classes of this problem and a numerical algorithm to construct any surface geometry, and I resolve the problem of properly converting these 2D geometries into their destined 3D shapes. Finally, I team up with an experimental group in realizing this scheme by imprinting our numerical solutions into liquid crystalline elastomer sheets. We show success in experimentally producing flat rubber-like sheets that, upon heating, take an arbitrary preprogrammed desired shape, such as a face.