The Influence of Dimension Effect on the Hydrothermal Aging Behavior of Aramid/Epoxy Composites

Öz

An investigation was carried out concerning the hydrothermal aging effect on the water intake character of aramid/epoxy composites based on the dimension effect. The aramid/epoxy composites were manufactured by the vacuum assisted resin infusion method (VARIM) kept in distilled water and sea water at 25 °C and 70 °C for 6 weeks in a controllable aging cabin. The water absorption behavior of composite samples cut with different length/width (L/w) ratios was assessed according to different water types and temperatures. Besides, the water intake character of aramid/epoxy samples was interpreted theoretically according to the Fick model. The experimental and theoretical results showed that aramid/epoxy composites displayed a tendency consistent with the Fickian model. Further, the water intake character of aramid/epoxy samples was affected by criteria such as sea water, distilled water, temperature, and different L/w ratio. The temperature increase was caused to more water absorption. Further, the increase of L/w ratio was caused to more water intake for both water types.

Anahtar Kelimeler

• Aramid/epoxy
• Hydrothermal aging
• Distilled water
• Sea water

Numune Boyut Etkisinin Aramid/Epoksi Kompozitlerin Hidrotermal Yaşlanma Davranışına Etkisi

Öz

Boyut etkisine bağlı olarak aramid/epoksi kompozitlerin su emme davranışı üzerindeki hidrotermal yaşlanma etkisi ile ilgili bir araştırma yapılmıştır. Vakum destekli reçine transfer yöntemi (VARIM) ile üretilen aramid/epoksi kompozitler, kontrol edilebilir bir yaşlandırma kabininde 6 hafta boyunca saf su ve deniz suyuna 25 °C ve 70 °C sıcaklıklarda daldırılmıştır. Farklı uzunluk/genişlik (L/w) oranlarında kesilen kompozit numunelerin su emme davranışları, farklı su tipleri ve sıcaklıklara göre değerlendirilmiştir. Ayrıca aramid/epoksi numunelerinin su emme özelliği teorik olarak Fick modeline göre yorumlanmıştır. Deneysel ve teorik sonuçlar, aramid/epoksi kompozitlerinin Fickian modeliyle tutarlı bir eğilim sergilediğini göstermiştir. Ayrıca aramid/epoksi kompozit numunelerin su emme davranışı, deniz suyu, saf su, sıcaklık ve farklı L/w oranı gibi kriterlerden etkilenmiştir. Sıcaklık artışı daha fazla su emilimine neden olmuştur. Ayrıca, L/w oranındaki artış, her iki su türü için daha fazla su alımına neden olmuştur.

Anahtar Kelimeler

• Aramid/epoksi
• Hidrotermal yaşlanma
• Saf su
• Deniz suyu

Kaynakça

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