Curvature-driven instabilities in thin active shells

TL;DR

This paper models how geometric incompatibilities in thin shells lead to various spontaneous shape-changing instabilities driven by preferred curvatures, with thresholds depending on shell geometry.

Contribution

It provides a minimal theoretical framework for understanding curvature-driven instabilities in shallow, thin shells with homogeneous preferred curvatures, including symmetry-breaking and inversion phenomena.

Findings

Identifies two types of super-critical symmetry breaking instabilities.

Discovers inversion and rotation instabilities with specific threshold behaviors.

Thresholds depend on shell geometry, matching experimental data for spherical caps.

Abstract

Spontaneous material shape changes, such as swelling, growth or thermal expansion, can be used to trigger dramatic elastic instabilities in thin shells. These instabilities originate in geometric incompatibility between the preferred extrinsic and intrinsic curvature of the shell, which may be modified by active deformations through the thickness and in plane respectively. Here, we solve the simplest possible model of such instabilities, which assumes the shells are shallow, thin enough to bend but not stretch, and subject to homogeneous preferred curvatures. We consider separately the cases of zero, positive and negative Gaussian curvature. We identify two types of super-critical symmetry breaking instability, in which the shell's principal curvature spontaneously breaks discrete up-down symmetry and continuous planar isotropy respectively. These are then augmented by inversion instabilities, in which the shell jumps sub-critically between up/down broken symmetry states, and rotation instabilities, in which the curvatures rotate by 90 degrees between states of broken isotropy without release of energy. Each instability has a thickness independent threshold value for the preferred extrinsic curvature proportional to the square-root of Gauss curvature. Finally, we show that the threshold for the isotropy-breaking instability is the same for deep spherical caps, in good agreement with recently published data.