Modifiye Edilmiş Re-entrant Ökzetik Tasarımın Çekme Yükü Altında İncelenmesi

Öz

Ökzetik yapılar negatif poisson oranları sayesinde birçok uygulamada sıklıkla tercih edilmektedir. Özellikle çekme yükü altında ökzetik yapılar hem boyuna uzama hem de enine genişleme özelliği sayesinde çok ilgi görmektedir. Literatürde çeşitli yükleme koşulları altında birçok ökzetik tasarım incelemesinin yapıldığı gözlemlenmiştir. Bu çalışmada da literatürde sıklıkla tercih edilen re-entrant ökzetik yapı şekilsel olarak modifiye edilmiştir. Orijinal ve şekilsel olarak modifiye edilen re-entrant ökzetik yapılar eşit çekme yükü altında incelenmiştir. Ayrıca ökzetik tasarımların ölçülerinin %30 artırılması/azaltılması durumlarının mekanik özelliklere etkisi araştırılmıştır. Çalışma sonucunda şekilsel olarak modifiye edilen ökzetik tasarımda orijinale kıyasla daha fazla eş değer gerilme ve enine genişleme ve benzer boyuna uzama sonuçları elde edilmiştir. Şekilsel olarak modifiye edilen tasarımda orijinale kıyasla daha fazla gerilme elde edilse de deformasyon açısından ökzetik özelliklerinin daha iyi olduğu tespit edilmiştir. Ayrıca ökzetik yapılarda ölçü azaltılmasının ökzetik özelliklere olumlu etkilediği belirlenmiştir. Çalışmada da yüzde otuz oranında ölçüleri azaltılan ökzetik yapının ökzetik özelliklerinin daha iyi olduğu elde edilen poisson oranı ve deformasyon sonuçlarıyla tespit edilmiştir.

Anahtar Kelimeler

• Ökzetik Tasarım
• Çekme Yüklemesi
• Negatif Poisson Oranı

Investigation of Modified Re-entrant Auxetic Design Under Tensile Load

Öz

Auxetic structures are frequently preferred in many applications due to their negative poisson ratios. Especially under tensile load, auxetic structures attract great attention due to both longitudinal extension and transverse expansion properties. It has been observed in the literature that many auxetic design studies have been conducted under various loading conditions. In this study, the re-entrant auxetic structure frequently preferred in the literature has been modified shapely. The original and shapely modified re-entrant auxetic structures have been examined under equal tensile load. In addition, the effect of increasing/decreasing the dimensions of auxetic designs by 30% has been investigated on mechanical properties. As a result of the study, more equivalent stress and transverse extension and similar longitudinal extension results have been obtained in the shapely modified auxetic design compared to the original. Although more stress has been obtained in the shapely modified design compared to the original, it has been determined that auxetic properties are better in terms of deformation. In addition, it has been determined that reducing the dimensions in auxetic structures has a positive effect on auxetic properties. In the study, it was determined that the auxetic structure, whose dimensions were reduced by thirty percent, had better auxetic properties, based on the obtained poisson ratio and deformation results.

Anahtar Kelimeler

• Auxetic Design
• Tensile Loading
• Negative Poisson Ratio

Kaynakça

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