Direct Foaming Approach for Reinforcing Re-entrant Auxetic Structures for Superior Compressive Properties and Energy Absorption

Baris Yilmaz; Elif Akar; Eyuphan Kucukkalfa; Kaan Yildiz

doi:10.1109/RAST57548.2023.10198008

Direct Foaming Approach for Reinforcing Re-entrant Auxetic Structures for Superior Compressive Properties and Energy Absorption

Baris Yilmaz, Elif Akar, Eyuphan Kucukkalfa, Kaan Yildiz

Aviation Institute

Istanbul Technical University

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Citation (Scopus)

Abstract

Mechanical metamaterials with negative Poisson's ratio, called auxetic structures, typically consist of specially-designed lattice geometries with repetitive units. Auxetics offer high indentation and impact resistance and expected to be used as potential lightweight materials in air and space industry by increasing the energy absorption and impact resistance with almost no weight increase by filling the unit cells with polymeric foams. This study addresses the reinforcement of re-entrant auxetic structures with polyurethane foams, via manual placement of as-produced foams into unit cells and direct foaming within unit cells. Compression tests were applied to assess compressive properties and energy absorption. Regardless of the foam-filling technique, both compressive properties and energy absorption were promoted. Furthermore, direct foaming within unit cells enabled better adhesion, yielding greater compressive strength and energy absorption compared to manual foam placement.

Original language	English
Title of host publication	Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9798350323023
DOIs	https://doi.org/10.1109/RAST57548.2023.10198008
Publication status	Published - 2023
Event	10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023 - Istanbul, Turkey Duration: 7 Jun 2023 → 9 Jun 2023

Publication series

Name	Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023

Conference

Conference	10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023
Country/Territory	Turkey
City	Istanbul
Period	7/06/23 → 9/06/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Funding

his study was carried out with the contributions of the Nanomaterials, Smart Textiles and Advanced Composites Research Group within the ITU Aerospace Research Center (ITUARC). The authors would like to thank The Scientific and Technological Research Council of Turkey Career Development Program 3501 (Project No. 121M993) for the partial funding. The authors would also gratefully acknowledge the support of Mr. Salih etinalp in 3D printing of auxetic structures. ACKNOWLEDGMENT This study was carried out with the contributions of the Nanomaterials, Smart Textiles and Advanced Composites Research Group within the ITU Aerospace Research Center (ITUARC). The authors would like to thank The Scientific and Technological Research Council of Turkey Career Development Program 3501 (Project No. 121M993) for the partial funding. The authors would also gratefully acknowledge the support of Mr. Salih Çetinalp in 3D printing of auxetic structures.

Funders	Funder number
ITU Aerospace Research Center
ITUARC
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu	121M993

Keywords

auxetic structures
energy absorption
mechanical metamaterials
polyurethane foam
reentrant structures

Access to Document

10.1109/RAST57548.2023.10198008

Cite this

Yilmaz, B., Akar, E., Kucukkalfa, E., & Yildiz, K. (2023). Direct Foaming Approach for Reinforcing Re-entrant Auxetic Structures for Superior Compressive Properties and Energy Absorption. In Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023 (Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/RAST57548.2023.10198008

Yilmaz, Baris ; Akar, Elif ; Kucukkalfa, Eyuphan et al. / Direct Foaming Approach for Reinforcing Re-entrant Auxetic Structures for Superior Compressive Properties and Energy Absorption. Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023. Institute of Electrical and Electronics Engineers Inc., 2023. (Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023).

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abstract = "Mechanical metamaterials with negative Poisson's ratio, called auxetic structures, typically consist of specially-designed lattice geometries with repetitive units. Auxetics offer high indentation and impact resistance and expected to be used as potential lightweight materials in air and space industry by increasing the energy absorption and impact resistance with almost no weight increase by filling the unit cells with polymeric foams. This study addresses the reinforcement of re-entrant auxetic structures with polyurethane foams, via manual placement of as-produced foams into unit cells and direct foaming within unit cells. Compression tests were applied to assess compressive properties and energy absorption. Regardless of the foam-filling technique, both compressive properties and energy absorption were promoted. Furthermore, direct foaming within unit cells enabled better adhesion, yielding greater compressive strength and energy absorption compared to manual foam placement.",

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Yilmaz, B, Akar, E, Kucukkalfa, E & Yildiz, K 2023, Direct Foaming Approach for Reinforcing Re-entrant Auxetic Structures for Superior Compressive Properties and Energy Absorption. in Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023. Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023, Institute of Electrical and Electronics Engineers Inc., 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023, Istanbul, Turkey, 7/06/23. https://doi.org/10.1109/RAST57548.2023.10198008

Direct Foaming Approach for Reinforcing Re-entrant Auxetic Structures for Superior Compressive Properties and Energy Absorption. / Yilmaz, Baris; Akar, Elif; Kucukkalfa, Eyuphan et al.
Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023. Institute of Electrical and Electronics Engineers Inc., 2023. (Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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Yilmaz B, Akar E, Kucukkalfa E, Yildiz K. Direct Foaming Approach for Reinforcing Re-entrant Auxetic Structures for Superior Compressive Properties and Energy Absorption. In Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023. Institute of Electrical and Electronics Engineers Inc. 2023. (Proceedings of 10th International Conference on Recent Advances in Air and Space Technologies, RAST 2023). doi: 10.1109/RAST57548.2023.10198008

Direct Foaming Approach for Reinforcing Re-entrant Auxetic Structures for Superior Compressive Properties and Energy Absorption

Abstract

Publication series

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Bibliographical note

Funding

Keywords

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