Harnessing energy landscape exploration to control the buckling of cylindrical shells

TL;DR

This paper explores the complex energy landscapes of cylindrical shells post-buckling, using computational models to understand transition mechanisms and develop design strategies for more resistant structures.

Contribution

It introduces a comprehensive survey of buckling landscapes combined with a novel landscape biasing method for targeted shell design.

Findings

Complex buckling landscapes at high strains and aspect ratios.

Landscape biasing enables targeted design modifications.

Structures can be made highly resistant to perturbations.

Abstract

The complexity and unpredictability of postbuckling responses in even simple thin shells have raised great challenges to emerging technologies exploiting buckling transitions. Here we comprehensively survey the buckling landscapes to show the full complexity of the stable buckling states and the transition mechanisms between each of them. This is achieved by combining a simple and versatile triangulated lattice model for modelling the shell morphologies with efficient high-dimensional free-energy minimisation and transition path finding algorithms. We show how the simple free energy landscapes of short, lightly compressed cylinders become vastly more complex at high compressive strains or aspect ratios. We then exploit these landscapes to introduce an effective method for targeted design - landscape biasing. This is used to inform thickness modifications enabling landscape redesign, and the development of structures which are highly resistant to lateral perturbations. Our methods are general, and can be extended to studying postbuckling responses of other geometries.