Fracture toughness of semi-regular lattices

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2023-05-15

Department

Department of Energy and Mechanical Engineering

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Language

en

Pages

9

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International Journal of Solids and Structures, Volume 270

Abstract

Previous studies have shown that the kagome lattice has a remarkably high fracture toughness. This architecture is one of eight semi-regular tessellations, and this work aims to quantify the toughness of three other unexplored semi-regular lattices: the snub-trihexagonal, snub-square and elongated-triangular lattices. Their mode I fracture toughness was obtained with finite element simulations, using the boundary layer technique. These simulations showed that the fracture toughness KIc of a snub-trihexagonal lattice scales linearly with relative density ρ̄. In contrast, the fracture toughness of snub-square and elongated-triangular lattices scale as ρ̄1.5, an exponent different from other prismatic lattices reported in the literature. These numerical results were then compared with fracture toughness tests performed on Compact Tension specimens made from a ductile polymer and produced by additive manufacturing. The numerical and experimental results were in excellent agreement, indicating that our samples had a sufficiently large number of unit cells to accurately measure the fracture toughness. This result may be useful to guide the design of future experiments.

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Funding Information: We would like to acknowledge the financial support of the Academy of Finland (decision 322007). Publisher Copyright: © 2023 The Author(s)

Keywords

Finite element simulation, Fracture test, Fracture toughness, Semi-regular lattices

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DOI

10.1016/j.ijsolstr.2023.112233

Citation

Omidi, M & St-Pierre, L 2023, 'Fracture toughness of semi-regular lattices', International Journal of Solids and Structures, vol. 270, 112233. https://doi.org/10.1016/j.ijsolstr.2023.112233

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https://urn.fi/URN:NBN:fi:aalto-202304262882

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