In-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity

While the separate design of functionally graded and fractal self-similarity structures had shown to be effective in improving the energy absorption capacities of honeycombs, their combined effect is still unknown. Hence, in this study, a series of novel fractal honeycombs are proposed based on the...

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Main Authors: Liu, Hu, Zhang, Ee Teng, Ng, Bing Feng
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/155211
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1552112022-02-10T07:19:35Z In-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity Liu, Hu Zhang, Ee Teng Ng, Bing Feng School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering::Mechanical engineering Impact Response In-Plane Crushing While the separate design of functionally graded and fractal self-similarity structures had shown to be effective in improving the energy absorption capacities of honeycombs, their combined effect is still unknown. Hence, in this study, a series of novel fractal honeycombs are proposed based on the combination of functionally gradient with fractal self-similarity features, which are constructed by varying the fractal parameter in each layer of the traditional self-similar honeycombs. Two graded fractal honeycombs with symmetric gradient and another two with asymmetric gradient are presented, and their dynamic crushing behaviors are numerically investigated. The numerical approach is first validated by comparing against theoretical and experimental data. Subsequently, it is demonstrated that the SG-I honeycomb can present the best energy absorption behavior (89% higher than traditional honeycomb) for low-velocity impact, while SG-II honeycomb performs the best for specific energy absorption (17% larger than traditional honeycomb) for high-velocity impact. Furthermore, deformation patterns under dynamic crushing can be controlled through the introduction of different gradient distributions. The graded fractal honeycombs present significant improvements to the absorbed energy and mean crushing force over traditional honeycombs, offering a new route to the design and optimization of future lightweight energy absorption systems with improved safety protection performance. Nanyang Technological University National Research Foundation (NRF) Accepted version The authors would like to thank the Singapore Centre for 3D Printing, which is supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Medium‐Sized Centre funding scheme, as well as the internal funding by Nanyang Technological University 04INS000329C160 and 04INS000453C160. 2022-02-10T07:19:35Z 2022-02-10T07:19:35Z 2021 Journal Article Liu, H., Zhang, E. T. & Ng, B. F. (2021). In-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity. Composite Structures, 270, 114106-. https://dx.doi.org/10.1016/j.compstruct.2021.114106 0263-8223 https://hdl.handle.net/10356/155211 10.1016/j.compstruct.2021.114106 2-s2.0-85107151981 270 114106 en 04INS000329C160 04INS000453C160 Composite Structures © 2021 Elsevier Ltd. All rights reserved. This paper was published in Composite Structures and is made available with permission of Elsevier Ltd. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Impact Response
In-Plane Crushing
spellingShingle Engineering::Mechanical engineering
Impact Response
In-Plane Crushing
Liu, Hu
Zhang, Ee Teng
Ng, Bing Feng
In-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity
description While the separate design of functionally graded and fractal self-similarity structures had shown to be effective in improving the energy absorption capacities of honeycombs, their combined effect is still unknown. Hence, in this study, a series of novel fractal honeycombs are proposed based on the combination of functionally gradient with fractal self-similarity features, which are constructed by varying the fractal parameter in each layer of the traditional self-similar honeycombs. Two graded fractal honeycombs with symmetric gradient and another two with asymmetric gradient are presented, and their dynamic crushing behaviors are numerically investigated. The numerical approach is first validated by comparing against theoretical and experimental data. Subsequently, it is demonstrated that the SG-I honeycomb can present the best energy absorption behavior (89% higher than traditional honeycomb) for low-velocity impact, while SG-II honeycomb performs the best for specific energy absorption (17% larger than traditional honeycomb) for high-velocity impact. Furthermore, deformation patterns under dynamic crushing can be controlled through the introduction of different gradient distributions. The graded fractal honeycombs present significant improvements to the absorbed energy and mean crushing force over traditional honeycombs, offering a new route to the design and optimization of future lightweight energy absorption systems with improved safety protection performance.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Liu, Hu
Zhang, Ee Teng
Ng, Bing Feng
format Article
author Liu, Hu
Zhang, Ee Teng
Ng, Bing Feng
author_sort Liu, Hu
title In-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity
title_short In-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity
title_full In-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity
title_fullStr In-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity
title_full_unstemmed In-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity
title_sort in-plane dynamic crushing of a novel honeycomb with functionally graded fractal self-similarity
publishDate 2022
url https://hdl.handle.net/10356/155211
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