Bioinspired 3D-printed auxetic structures with enhanced fatigue behavior

Shirzad, M, Kang, J, Kim, G, Bodaghi, M ORCID: https://orcid.org/0000-0002-0707-944X and Nam, SY, 2024. Bioinspired 3D-printed auxetic structures with enhanced fatigue behavior. Advanced Engineering Materials. ISSN 1438-1656

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Abstract

Recently, auxetic metastructures have gained considerable attention in various fields of study due to their unique characteristics. This study aims to design and fabricate bioinspired auxetic structures and comprehensively investigate the static and dynamic mechanical properties of those architectures under tensile and compressive loads. A comparative analysis is carried out with a conventional structure, considering static tensile and compressive tests, as well as dynamic tension–tension and compression–compression assessments. Experimental measurements and finite-element analysis are utilized to evaluate various parameters of the scaffolds, such as Young's modulus, yield strength, energy absorption, stress distribution, Poisson's ratio, and fatigue properties. The findings reveal that bioinspired auxetic structures can appropriately mimic the physical attributes and stress–strain characteristics of human tissue, such as the Achilles tendon. Furthermore, these bioinspired auxetic structures significantly enhance the cycles to failure compared to conventional structures, accompanied by notable improvements in energy absorption. Among the auxetic structures, the star configuration exhibits remarkable tolerance to tensile fatigue loads, while the sharp sinus structure demonstrates the highest tolerance to cycles to failure under compression–compression loads. The static and fatigue properties of bioinspired auxetic structures indicate their potential for biomedical applications.

Item Type:	Journal article
Publication Title:	Advanced Engineering Materials
Creators:	Shirzad, M., Kang, J., Kim, G., Bodaghi, M. and Nam, S.Y.
Publisher:	Wiley
Date:	27 March 2024
ISSN:	1438-1656
Identifiers:	Number Type 10.1002/adem.202302036 DOI 1884438 Other
Rights:	This is the peer reviewed version of the following article: Shirzad, M., Kang, J., Kim, G., Bodaghi, M. and Nam, S.Y. (2024), Bioinspired 3D-Printed Auxetic Structures with Enhanced Fatigue Behavior. Adv. Eng. Mater. 2302036, which has been published in final form at https://doi.org/10.1002/adem.202302036. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Divisions:	Schools > School of Science and Technology
Record created by:	Melissa Cornwell
Date Added:	22 Apr 2024 10:22
Last Modified:	22 Apr 2024 13:38
URI:	https://irep.ntu.ac.uk/id/eprint/51278

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