TY - JOUR
T1 - Snap-induced morphing
T2 - From a single bistable shell to the origin of shape bifurcation in interacting shells
AU - Liu, Mingchao
AU - Domino, Lucie
AU - Dinechin, Iris Dupont de
AU - Taffetani, Matteo
AU - Vella, Dominic
PY - 2023/1/1
Y1 - 2023/1/1
N2 - 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.
AB - 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.
UR - https://research-information.bris.ac.uk/en/publications/f7d5bc68-fcdc-438b-a1da-20754e5c5766
U2 - 10.1016/j.jmps.2022.105116
DO - 10.1016/j.jmps.2022.105116
M3 - Article
SN - 0022-5096
VL - 170
JO - Journal of the mechanics and physics of solids
JF - Journal of the mechanics and physics of solids
M1 - 105116
ER -