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Crashworthiness and gradient optimization of multi-cell thin-walled structures inspired by leaf venation in royal water lily.

Authors :
Wei, Zhiquan
Wang, Huanbo
Bi, Ying
Li, Yuanmeng
Li, Bo
Wang, Bo
Source :
Mechanics of Advanced Materials & Structures. Dec2024, p1-17. 17p. 20 Illustrations.
Publication Year :
2024

Abstract

AbstractAs a key component of lightweight impact-protection devices, thin-walled structures with marvelous specific energy absorption (SEA) have attracted wide attention. Inspired by leaf venation in royal water lily, a hybrid multi-cell thin-walled structure with fractal and hierarchy architectures is proposed. Its crashworthiness is compared with traditional cylinder by combining finite element simulation and experiment, and corresponding mechanism is revealed. The results show that due to more folds and smaller folded wavelength, the venation-like structure exhibits better crashworthiness than the cylinder. Increasing the initial bifurcation number and hierarchy level of venation-like structure will introduce massive corner constraints, especially the hierarchy level, which benefits folding deformation and improving effectively crashworthiness. Further, a fully hybrid venation-like structure is designed by introducing gradient architecture. With the increase of length-gradient or thickness-gradient, the SEA first linearly increases and then slightly decreases. Under the optimal length-gradient, majority of area exhibits high internal energy. By taking the gradient length and thickness simultaneously, a kind of hybrid deformation mode with quasi-uniform small folding and overall large folding appears, where multiple small folds interacts strongly, achieving good load-bearing capacity. The optimal SEA of venation-like structure is 81.5% higher than that of the cylinder. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
15376494
Database :
Academic Search Index
Journal :
Mechanics of Advanced Materials & Structures
Publication Type :
Academic Journal
Accession number :
181564345
Full Text :
https://doi.org/10.1080/15376494.2024.2438912