Biaxial porosity gradient and cell size adjustment improve energy absorption in rigid and flexible 3D-printed reentrant honeycomb auxetic structures
Date
2024-06-01
Authors
Štaffová, Martina
Ondreáš, František
Žídek, Jan
Jančář, Josef
Lepcio, Petr
0000-0002-3586-9764Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
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Abstract
This paper compares different uniaxial and biaxial graded designs of auxetic reentrant honeycomb structures to enhance their mechanical properties, especially the specific energy absorption under compressive load. The lattice structures were 3D printed using the vat photopolymerization masked-stereolithography technique from two different materials - tough (OR) and flexible (FR). The results were evaluated from a material and structural point of view, investigating the effect of porosity, cell number, size, graded design, and fracture mode. The universally best energy-absorbing performance was found in a biaxially graded structure with a center-wise location of the highest local porosity. Depending on the used resin, its energy absorption capacity was up to 2-3 times enhanced compared to a reference uniform-porosity auxetic design. The presented data constitutes a fundamental understanding of auxetic structures and identifies practical approaches for tuning the auxetic structures' performance regarding their mechanical response. Finally, this study demonstrates the potential of shape versatility offered by 3D printing and other additive manufacturing techniques.
Description
Citation
Results in Engineering. 2024, vol. 22, issue 6, p. 1-13.
https://www.sciencedirect.com/science/article/pii/S2590123024005048
https://www.sciencedirect.com/science/article/pii/S2590123024005048
Document type
Peer-reviewed
Document version
Published version
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Language of document
en