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Topology morphing lattice structures

Sundararaman, Venkatesh; O'Donnell, Matt; Chenchiah, Isaac V.; Weaver, Paul

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Authors

Venkatesh Sundararaman

Matt O'Donnell

Isaac V. Chenchiah

Paul Weaver



Abstract

Planar cellular lattice structures subject to axial compression may undergo elastic bending or buckling of the unit cells. If sufficient compression is applied, the columns of adjacent cells make contact. This changes the topology of the lattice by establishing new load paths. This topology change induces a corresponding shift in the effective stiffness characteristics of the lattice-in particular, the shear modulus undergoes a step-change. The ability to embed adaptive stiffness characteristics through a topology change allows structural reconfiguration to meet changing load/operational requirements efficiently. The concept, of topological reconfiguration, can be exploited across a range of length scales, from (meta-)materials to components. Here we focus on macroscopic behaviour presenting results obtained from finite element analysis that shows excellent correlation with the observed response of 3Dprinted PLA lattices. Through a parametric study, we explore the role of key geometric and stiffness parameters and identify desirable regions of the design space. The non-linear responses demonstrated by this topology morphing lattice structure may offer designers a route to develop bespoke elastic systems.

Citation

Sundararaman, V., O'Donnell, M., Chenchiah, I. V., & Weaver, P. (2021). Topology morphing lattice structures. In Proceedings Series: ASME 2021 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. https://doi.org/10.1115/SMASIS2021-67531

Conference Name SMASIS Conference on Smart Materials, Adaptive Structures and Intelligent Systems 2021
Start Date Sep 14, 2021
End Date Sep 15, 2021
Acceptance Date Jun 4, 2021
Online Publication Date Oct 20, 2021
Publication Date Oct 20, 2021
Deposit Date Jun 29, 2021
Publicly Available Date Mar 29, 2024
Book Title Proceedings Series: ASME 2021 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
ISBN 9780791885499
DOI https://doi.org/10.1115/SMASIS2021-67531
Public URL https://uwe-repository.worktribe.com/output/7498988

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