Tailoring elastic bandgaps and moduli of triply periodic minimal surface structures by a hybrid technique
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Author list: Savoeurn N.; Janya-Anurak C.; Uthaisangsuk V.
Publisher: Taylor and Francis Group
Publication year: 2024
Journal acronym: Mech. Adv. Mater. Struct.
ISSN: 1537-6494
eISSN: 1537-6532
Languages: English-Great Britain (EN-GB)
Abstract
This work aimed to investigate elastic dispersion behaviors of triply periodic minimal surface (TPMS) lattice structures. The dispersion curves were established using the finite element (FE) Bloch reduction method, in which the Bloch periodic boundary condition was implied via the Bloch transform matrix. Four different types of both surface- and solid-based TPMS lattices with varying relative densities were considered. It was found that only the solid-based Neovius and Schwarz structures provided complete elastic bandgaps. Then, elastic stiffnesses of the structures obtained by representative volume element (RVE) models were evaluated with regard to their achieved band gaps. Reducing the volume fraction of lattices obviously enhanced the bandgap behaviors, while decreasing the specific moduli. Moreover, new hybrid phononic lattices were introduced for tailoring the elastic bandgap and mechanical properties. The results showed that incorporating the strut-based face-centered cubic (FCC) lattice in the TPMS structures could obviously improve the bandgap characteristics and simultaneously maintain reasonable specific elastic properties. Finally, wave suppression structure by using the dispersion curves was demonstrated by examining a simple beam infilled with the periodic lattices under excited loads. It was shown that the TPMS structures could be well applied as an effective wave suppression feature in load-bearing structures. © 2024 Taylor & Francis Group, LLC.
Keywords
elastic bandgap, specific stiffness, TPMS
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