Snap-induced morphing: From a single bistable shell to the origin of shape bifurcation in interacting shells

Mingchao Liu, Lucie Domino, Iris Dupont de Dinechin, Matteo Taffetani, Dominic Vella

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The bistability of embedded elements provides a natural route through which to introduce reprogrammability to elastic meta-materials. One example of this is the soft morphable sheet, in which bistable elements that can be snapped up or down, are embedded within a soft sheet. The state of the sheet can then be programmed by snapping particular elements up or down, resulting in different global shapes. However, attempts to leverage this programmability have been limited by the tendency for the deformations induced by multiple elastic elements to cause large global shape bifurcations. We study the root cause of this bifurcation in the soft morphable sheet by developing a detailed understanding of the behaviour of a single bistable element attached to a flat ‘skirt’ region. We study the geometrical limitations on the bistability of this single element, and show that the structure of its deformation can be understood using a boundary layer analysis. Moreover, by studying the compressive strains that a single bistable element induces in the surrounding skirt we show that the shape bifurcation in the soft morphable sheet can be delayed by an appropriate design of the lattice on which bistable elements are placed.

Original languageEnglish
Article number105116
JournalJournal of the mechanics and physics of solids
Volume170
Early online date25 Oct 2022
DOIs
Publication statusPublished - 1 Jan 2023

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