Yıl 2019, Cilt , Sayı 17, Sayfalar 1325 - 1333 2019-12-31

KNT-Cam Fiber Takviyeli Kompozitlerin Kırılma Tokluğunun Birleşik Bir Güçlendirme Stratejisi ile İyileştirilmesi

Kaan Yıldız [1] , İdris Gürkan [2] , Fırat Turgut [3] , Hülya Cebeci [4]


Düzlem-dışı yükleme durumlarında karşılaşılan düşük katmanlararası mekanik özellikler, cam fiber takviyeli kompozitlerin (GFRP) sahip olduğu en büyük kusurlardan biris olarak bilinmektedir. Fiber üzerinde hiyerarşik yapıdaki nano boyutta güçlendiriciler (örneğin: karbon nanotüpler (KNT’ler)), sahip oldukları sıradışı mekanik özellikler ve düşük yoğunlukları sayesinde kompozitlerin katmanlararası özelliklerini geliştirmek için kullanılmaktadır. Bahsedilen bu iyileştirmeler, yapıda herhangi bir ciddi ağırlık artışına sebep olmadan gerçekleştirilebilmektedir. Özellikle, yapısal iyileştirmelerin ağırlık artışından bağımsız olarak yapılması havacılık ve uzay yapıları uygulamalarının bir isteri olup, KNT’lere bu alanda geniş bir araştırma alanı oluşturmaktadır. Yapılan bu çalışmada, KNT-takviyeli GFRP’lerin mekanik özellikleri incelenmiştir. KNT’lerin epoksi matris içerisinde dağıtılması ve cam fiber üzerinde direkt olarak büyütülmesi olmak üzere iki farklı güçlendirme stratejisi ele alınmıştır. Bunlardan ilki cam fiber üzerinde karışık mimaride KNT büyütülmesi (F-GFs) olarak bilinirken, diğeri ise nano-tüp takviyeli kompozitler (NRC) olarak literatürde yer edinmiştir. Bu iki farklı güçlendirme stratejisinin kullanılmasıyla elde edilen kompozitler ise bu çalışmada karışık nano-takviyeli kompozitler (F-NRC) olarak ele alınmıştır. Bu çalışmanın odak noktası olarak F-GF ve F-NRC’ler seçilmiştir ve güçlendirme stratejilerinin potansiyeli laboratuvar ölçütlerinde deneysel olarak incelenmiştir. Üretilen kompozitlerin fiberleri üzerindeki hiyerarşik KNT yapılanması taramalı elektron mikroskopisi (SEM) ile gözlenmiştir. Ayrıca, Raman spektroskopisi ve termogravimetrik analiz (TGA) ile KNT’lerin kalitesi ve ısıl kararlılığı araştırılmıştır. Kompozitlerin mekanik özellikleri ise Mod-I kırılma tokluğu testi ve tek yönlü kompozit çekme testi ile karakterize edilmiştir. Her ne kadar F-NRC’lerin kırılma tokluğunda %150’lik iyileştirmeler gözlenmiş olsa da çekme dayanımında, cam fiberlerin KNT üretimi sırasında maruz kalınan ısıl işlemin sonucu olarak %25’lik azalma elde tespit edilmiştir. Mekanik testler sonucunda elde edilen bulgular, yukarıda belirtilen karakterizasyon çalışmalarından çıkarılan sonuçlar ile desteklenmektedir.
karbon nanotüp, karışık fiber, cam/epoksi kompozit, kırılma tokluğu
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Yazarlar

Orcid: 0000-0002-2670-8619
Yazar: Kaan Yıldız (Sorumlu Yazar)
Kurum: ISTANBUL TECHNICAL UNIVERSITY
Ülke: Turkey


Orcid: 0000-0000-0000-0000
Yazar: İdris Gürkan
Kurum: ISTANBUL TECHNICAL UNIVERSITY
Ülke: Turkey


Orcid: 0000-0000-0000-0000
Yazar: Fırat Turgut
Kurum: ISTANBUL TECHNICAL UNIVERSITY
Ülke: Turkey


Orcid: 0000-0002-0264-6484
Yazar: Hülya Cebeci
Kurum: ISTANBUL TECHNICAL UNIVERSITY
Ülke: Turkey


Tarihler

Yayımlanma Tarihi : 31 Aralık 2019

APA Yıldız, K , Gürkan, İ , Turgut, F , Cebeci, H . (2019). KNT-Cam Fiber Takviyeli Kompozitlerin Kırılma Tokluğunun Birleşik Bir Güçlendirme Stratejisi ile İyileştirilmesi. Avrupa Bilim ve Teknoloji Dergisi , (17) , 1325-1333 . DOI: 10.31590/ejosat.661648