PSI - Issue 46

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 46 (2023) 68–73

5th International Conference on Structural Integrity and Durability Fatigue resistance of the auxetic honeycombs Branko Ne č emer a* , Željko Boži ć b , Sre č ko Glodež a a University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia b University of Zagreb, Faculty of Mech. Eng. And Nav. Arch., I. Lu č i ć a 5, 10000 Zagreb, Croatia

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2021 Organizers Abstract This study presents the computational analysis for determining the fatigue resistance of five different auxetic honeycombs made of aluminium alloy AA 5083-H111: (i) A Chiral auxetic structure, (ii) A Star-shaped auxetic structure, (iii) A S-shaped auxetic structure, (iv) A Double arrowhead auxetic structure and (v) A Re-entrant auxetic structure. This research is based on the authors previous work, where the computational model for the fatigue analyses of the auxetic structures was built and validated. For the fatigue life calculation, the strain life approach was applied, with consideration of a Morrow mean stress correction in the framework of the ANSYS software. The computational analysis was performed in a displacement control regime at different amplitude strain levels. The computational results have shown that the chiral and star-shaped auxetic structure demonstrates a higher fatigue strength if compared to the other auxetic honeycombs. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2021 Organizers Keywords: Auxetic honeycombs; Fatigue behaviour; Computational analyses; Strain life approach 1. Introduction Auxetic cellular structures are modern metamaterials that exhibit a negative Poisson's ratio. The negative Poisson's ratio is a consequence of rotating cells in the geometry of the auxetic structure when an external load is applied (Ne č emer et al. (2019)). The advanced geometrical possibilities of auxetic cellular materials provide many opportunities for their wide application due to their particular and unique mechanical properties. The auxetic cellular structures have substantial potential applications in Aerospace Engineering, the Automobile Industry, Construction,

* Corresponding author. Tel.: +386-2-220-7832; fax: +386-2-220-7994. E-mail address: branko.necemer@um.si

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2021 Organizers

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2021 Organizers 10.1016/j.prostr.2023.06.012