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Compressive Response of Non-slender Octet Carbon Microlattices

Kudo, Akira and Misseroni, Diego and Wei, Yuchen and Bosia, Federico (2019) Compressive Response of Non-slender Octet Carbon Microlattices. Frontiers in Materials, 6 . Art. No. 169. ISSN 2296-8016. doi:10.3389/fmats.2019.00169.

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Lattices are periodic three-dimensional architected solids designed at the micro and nano-scale to achieve unique properties not attainable by their constituent materials. The design of lightweight and strong structured solids by additive manufacturing requires the use of high-strength constituent materials and non-slender geometries to prevent strut elastic instabilities. Low slenderness carbon octet microlattices are obtained through pyrolysis of polymeric architectures manufactured with stereolithography technique. Their compressive behavior is numerically and experimentally investigated when the relative density ρ ranges between 10 and 50%, with specific stiffness and strength approaching the limit of existing micro and nanoarchitectures. It is shown that additive manufacturing can introduce imperfections such as increased nodal volume, non-cubic unit cell, and orientation-dependent beam slenderness, all of which deeply affect the mechanical response of the lattice material. An accurate numerical modeling of non-slender octet lattices with significant nodal volumes is demonstrated to overcome the limitations of classical analytical methods based on beam theory for the prediction of the lattice stiffness, strength and scaling laws. The presented numerical results and experimental methods provide new insights for the design of structural carbon architected materials toward ultra-strong and lightweight solids.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kudo, Akira0000-0002-0830-5509
Bosia, Federico0000-0002-2886-4519
Additional Information:© 2019 Kudo, Misseroni, Wei and Bosi. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. Received: 14 January 2019; Accepted: 01 July 2019; Published: 31 July 2019. Author Contributions: AK, DM, and FB designed the research, discussed the results, and wrote the paper. DM and FB carried out the analytical and numerical analyses. AK manufactured the specimens. AK and YW performed the experiments. All authors reviewed the paper and gave final approval for publication. Funding: Vannevar-Bush Faculty Fellowship of the US Department of Defense. The Resnick Sustainability Institute Postdoctoral Fellowship of Caltech. Financial support from National Group of Mathematical Physics (GNFM-INdAM). Conflict of Interest Statement: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Acknowledgments: AK gratefully acknowledges the financial support from the Resnick Sustainability Institute at the California Institute of Technology and from Prof. Julia R. Greer (Caltech) through the Vannevar-Bush Faculty Fellowship of the US Department of Defense. The authors thank Prof. Julia R. Greer's research group (Caltech) and Prof. Sergio Pellegrino (Caltech) for their support in conducting experiments in their laboratories.
Group:Resnick Sustainability Institute
Funding AgencyGrant Number
Vannever Bush Faculty FellowshipUNSPECIFIED
Resnick Sustainability InstituteUNSPECIFIED
Gruppo Nazionale per la Fisica MatematicaUNSPECIFIED
Subject Keywords:architected materials, additive manufacturing, structural metamaterials, pyrolyzed lattices, mechanics
Record Number:CaltechAUTHORS:20190815-100030629
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Official Citation:Kudo A, Misseroni D, Wei Y and Bosi F (2019) Compressive Response of Non-slender Octet Carbon Microlattices. Front. Mater. 6:169. doi: 10.3389/fmats.2019.00169
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97916
Deposited By: Tony Diaz
Deposited On:15 Aug 2019 17:17
Last Modified:16 Nov 2021 17:35

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