PSI - Issue 68

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 68 (2025) 66–76

European Conference on Fracture 2024 Shape memory-based lattice metamaterial: the octet truss cell European Conference on Fracture 2024 Shape memory-based lattice metamaterial: the octet truss cell

C. Corda a , E. Armentani a , C. Bertolin b,* , C. Gao b a Department of Industrial Engineering, University of Naples Federico II, Naples, Italy b Department of Mechanical and Industrial Engineering, NTNU, Trondheim, Norway C. Corda a , E. Armentani a , C. Bertolin b,* , C. Gao b a Department of Industrial Engineering, University of Naples Federico II, Naples, Italy b Department of Mechanical and Industrial Engineering, NTNU, Trondheim, Norway

Abstract Lattice metamaterial attracted great attention in the last years due to their intelligent behaviour when subjected to external stimuli, which is also denoted as shape memory effect. This is the principle on how the 4D Additive Manufacturing is based on: it is possible to create complex geometry making the material “programmable” building up self-assembly structures. In this preliminary study, the octet lattice metamaterial has been selected to evaluate its performance by taking into account of shape memory effect investigating on its great properties in adaptability in shock absorption, negative Poisson’s ratio, high stiffness and weight efficiency with previous studies conducted in literature; its structure as designed on the commercial software ABAQUS. Through the finite element analysis has been possible to perform the structure under uniaxial compression test studying its response under specific loads changing geometrical configurations -e.g., relative density, diameter of truss- to fully understand the mechanism of the octet lattice metamaterial. The preliminary results show clearly great potential offered by octet truss lattice metamaterial with shape memory effect in terms of shape and stress recovery and in terms of planned structure degradation which could be advantageously exploited in future for many industrial applications. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers Abstract Lattice metamaterial attracted great attention in the last years due to their intelligent behaviour when subjected to external stimuli, which is also denoted as shape memory effect. This is the principle on how the 4D Additive Manufacturing is based on: it is possible to create complex geometry making the material “programmable” building up self-assembly structures. In this preliminary study, the octet lattice metamaterial has been selected to evaluate its performance by taking into account of shape memory effect investigating on its great properties in adaptability in shock absorption, negative Poisson’s ratio, high stiffness and weight efficiency with previous studies conducted in literature; its structure as designed on the commercial software ABAQUS. Through the finite element analysis has been possible to perform the structure under uniaxial compression test studying its response under specific loads changing geometrical configurations -e.g., relative density, diameter of truss- to fully understand the mechanism of the octet lattice metamaterial. The preliminary results show clearly great potential offered by octet truss lattice metamaterial with shape memory effect in terms of shape and stress recovery and in terms of planned structure degradation which could be advantageously exploited in future for many industrial applications. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers

Keywords: Shape Memory Polymer; Octet Truss Cell; Metamaterial; 4D-printing.

* Corresponding author. E-mail address: chiara.bertolin@ntnu.no * Corresponding author. E-mail address: chiara.bertolin@ntnu.no

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers

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