Effect of Cut-outs on the Free Vibration Response of Basalt/Carbon Hybrid Composites

Yıl 2021, Cilt: 21 Sayı: 3, 724 - 734, 30.06.2021

Özkan Özbek , Yüksel Tokur Bozkurt

https://doi.org/10.35414/akufemubid.889289

Cited By: 3

Öz

The current work deals with an experimental investigation about the influence of cut-outs on dynamic characteristics of basalt/carbon hybrid fiber reinforced composite laminates. The composite samples have been fabricated via vacuum assisted resin transfer molding technique and cut-outs in the form of triangular, square and circular shapes with equal areas have been processed on them to systematically analyze the influences of cut-outs. The dynamic characteristics of the samples have been examined by conducting free vibration-damping tests and expressed in terms of natural frequency and damping ratio using the frequency response and time-acceleration response. The results show that the damping characteristics of the composite samples can be remarkably improved with the help of cut-outs which provide improvements approximately between 2.41% and 16.65% in damping ratio values. The maximum and minimum variations in damping ratio have observed for non-hybrid carbon fiber reinforced composite samples with triangular cut-out (T-C6) and hybrid basalt/carbon fiber reinforced composite samples with circular cut-out (C-B6), respectively. On the other hand, the presence of cut-outs have led to decreases in natural frequency values as a result of reduction in stiffness caused by the cut-outs. This point out that employment of cut-outs can be a promising application to meet the natural frequency requirements of engineering systems constructed with hybrid fiber reinforced composite laminates.

Anahtar Kelimeler

Cut-out, Hybrid composite, Damping, Vibration, Stacking sequences

Kesiklerin Bazalt / Karbon Hibrit Kompozitlerin Serbest Titreşim Tepkisine Etkileri

Öz

Mevcut çalışma, kesiklerin bazalt / karbon melez fiber takviyeli lamine kompozitlerin dinamik özellikleri üzerindeki etkisi hakkında deneysel bir araştırma ile ilgilidir. Kompozit numuneler, vakum destekli reçine transfer kalıplama tekniği ile imal edilmiş ve kesiklerin etkilerini sistematik olarak analiz etmek için üzerlerinde eşit alanlara sahip üçgen, kare ve dairesel şekiller şeklinde delikler açılmıştır. Numunelerin dinamik özellikleri, serbest titreşim sönümleme testleri yapılarak incelenmiş ve frekans tepkisi ve zaman-ivme tepkisi kullanılarak doğal frekans ve sönümleme oranı cinsinden ifade edilmiştir. Sonuçlar, kompozit numunelerin sönümleme özelliklerinin, sönümleme oranı değerlerinde yaklaşık %2,41 ile %16,65 arasında artışlar sağlayan kesikler yardımıyla önemli ölçüde iyileştirilebileceğini göstermektedir. Sönümleme oranındaki maksimum ve minimum varyasyonlar, sırasıyla üçgen kesikli hibrit olmayan karbon fiber takviyeli kompozit numuneler (T-C6) ve dairesel kesikli hibrit olmayan bazalt fiber takviyeli kompozit numuneler (C-B6) için gözlemlenmiştir. Öte yandan, kesiklerin varlığı, deliklerin neden olduğu sertlikte azalmanın bir sonucu olarak doğal frekans değerlerinde düşüşlere yol açmıştır. Bu, kesiklerin kullanılmasının, hibrit fiber takviyeli kompozit laminatlarla inşa edilen mühendislik sistemlerinin doğal frekans gereksinimlerini karşılamak için umut verici bir uygulama olabileceğini göstermektedir.

Anahtar Kelimeler

Kesik, Hibrit kompozit, Sönümleme, Titreşim, İstifleme sırası

Kaynakça

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