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Journals / Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi / 2026 / Cilt: 41 Sayı: 2

Design and evaluation of modified double arrowhead auxetic honeycombs under compression loading

Çift ok başlı auxetik petek yapılarının tasarımı ve basma yükü altındaki performanslarının değerlendirmesi

Ömercan Gürcan(AFYON KOCATEPE ÜNİVERSİTESİ)0009-0005-7882-5103
Nihal Yumak(AFYON KOCATEPE ÜNİVERSİTESİ)0000-0003-4492-7142
Pages
815–828
Publication Date
2026-07-20
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The results showed that the design modifications significantly improved compressive behavior and deformation characteristics across all specimens.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The unit cells of the double-arrowhead auxetic (AAH) structure were modified with curved beams, circular nodes, and chiral structures to design geometries with superior compressive properties.
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Key Findings & Data:Model-1 and Model-2 were designed using long and short curved beams, while Model-3 and Model-4 were developed by hybridizing these geometries with chiral structures.
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Conclusion & Impact:The results showed that the design modifications significantly improved compressive behavior and deformation characteristics across all specimens.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Öksetik yapılar · çift ok başlı öksetik yapı · negatif Poisson oranı

Abstract

The unit cells of the double-arrowhead auxetic (AAH) structure were modified with curved beams, circular nodes, and chiral structures to design geometries with superior compressive properties. Model-1 and Model-2 were designed using long and short curved beams, while Model-3 and Model-4 were developed by hybridizing these geometries with chiral structures. In this study, the classical AAH structure (Model-0) was used as a control specimen. Compression tests were conducted, and the compressive properties were evaluated in terms of Poisson’s ratio, specific energy absorption (SEA), and crushing parameters. Deformation mechanisms were analyzed using test images. The results showed that the design modifications significantly improved compressive behavior and deformation characteristics across all specimens. In particular, the addition of chiral structures increased stiffness and deformation stability, leading to higher load-carrying capacity in the plateau region. Compared to Model-0, the highest SEA values were obtained in Model-3 and Model-4, with increases of 122.9% and 96.78%, respectively. Chiral structures also restricted lateral motion, resulting in reduced auxeticity and higher Poisson’s ratios. The lowest Poisson’s ratio was observed in Model-1 (-2.7), approximately 2.5 times lower than that of Model-0 .

Özet

Çift ok başlı öksetik (ÇOÖ) yapının birim hücresi eğrisel kirişler, dairesel düğümler ve kiral yapılar ile modifiye edilerek üstün basma özelliklerine sahip öksetik geometriler tasarlanmıştır. Uzun ve kısa eğrisel kirişlerle Model-1 ve Model-2, bu geometrilerin kiral yapılarla hibritleştirilmesiyle Model-3 ve Model-4 tasarlanmıştır. Çalışmada klasik ÇOÖ yapı (Model-0) ise kontrol numunesi olarak kullanılmıştır. Tüm numunelere basma testi uygulanmış ve yapıların basma özellikleri Poisson oranı, spesifik enerji emilimi (SEE) ve ezilme performans parametreleri üzerinden değerlendirilmiştir. Öksetik yapıların deformasyon mekanizmaları ise basma testleri esnasında kaydedilen görüntüler kullanılarak incelenmiştir. Test sonuçları, öksetik yapıların birim hücrelerinde yapılan tasarım değişikliklerinin tüm numune gruplarında basma özelliklerini ve deformasyon karakteristiklerini belirgin şekilde iyileştirdiğini göstermiştir. Özellikle birim geometriye eklenen kiral yapılarla birlikte tasarımların rijitliği ve deformasyon stabilitesi artmış ve bu yapılarda plato bölgesinde daha yüksek yük taşıma kapasitesi elde edilmiştir. Model-0’a kıyasla en yüksek SEE değerleri sırasıyla %122,9 ve %96,78 artış ile Model-3 ve Model-4 numunelerinde elde edilmiştir. Kiral yapılar aynı zamanda birim hücrelerin yanal hareketini engellemiş bunun sonucunda öksetiklik azalmış ve bu numunelerde Poisson oranı daha yüksek ölçülmüştür. Tüm numune grupları arasında en düşük Poisson oranı Model-1 numunesinde -2,7 olarak, Model-0 kıyas numunesinden yaklaşık 2,5 kat daha küçük olarak elde edilmiştir.

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Cite This Article

Gürcan, Ö., Yumak, N. (2026). Design and evaluation of modified double arrowhead auxetic honeycombs under compression loading. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, Cilt: 41 Sayı: 2, 815–828. https://doi.org/10.17341/gazimmfd.1779283

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