Shape optimization of buckling-based deployable stiff structures

Abstract

This study considers deployable structures and presents a novel optimization method that aims to improve the stiffness at the fully deployed state. The considered structures consist of curved beams that deploy through buckling when rotated. The optimization aims to maximize the structural tangent stiffness by modifying the shape of the beam elements. To accurately predict the deformation, Finite Element Method (FEM) simulations were conducted. A design with an increase of up to 19.6% in structural tangent stiffness was achieved, while conserving the structural volume. The approach is validated by manufacturing the deployable structures using laser cutting and performing compression tests. Experimental results show consistency within a 5% range with the optimization results. These findings support the implementation of the optimization scheme for achieving optimum structural designs of deployable structures.