Farklı Fiber Dizilimlerine Sahip Kompozit Levhalar Üzerinde Nem ve Sıcaklık Etkisi

Bu çalışmada, farklı fiber takviye açılarına ve farklı genişliklere sahip cam fiber takviyeli epoksi kompozit levhalar üzerinde nem ve sıcaklık etkisi deneysel olarak araştırılmıştır. Bu amaçla, fiber takviye açıları [0°]8 ve [45°/-45°/0°/90°]s olan kompozit levhalar, 25 mm ve 30 mm ölçülerinde hazırlanarak 40 °C, 60 °C ve 80 °C sıcak suyun içerisine, 15 gün, 30 gün ve 45 gün süre ile bekletilmiştir. Süre bitiminde numunelerin nem emilim oranları ve dayanımları elde edilmiştir. Elde edilen verilerin kendi aralarında ve kuru numuneler ile karşılaştırılması yapılmıştır. Ayrıca Taramalı Elektronik Mikroskop (SEM) yardımıyla numunelerin morfolojileri görüntülenerek, nem ve sıcaklığın hasar davranışları üzerindeki etkileri incelenmiştir. [45°/-45°/0°/90°]s fiber dizilimli numunelerin dayanımının, [0°]8 fiber dizilimli numunelerden elde edilen dayanım değerlerinden daha düşük olduğu tespit edilmiştir. Bekleme süresi ve sıcaklık derecesi arttığı zaman numunelerin matris/fiber yapısında bozulmaların meydana geldiği, buna bağlı olarak da dayanım değerlerinin düştüğü tespit edilmiştir.

Anahtar Kelimeler:

Nem etkisi, sıcaklık etkisi, hasar yükü, kompozit levha, SEM, Nem etkisi, sıcaklık etkisi, hasar yükü, kompozit levha, SEM

Effect of Humidity and Temperature on Composite Plates With Different Fiber Orientations

In this study, the effect of humidity and temperature on glass fiber reinforced epoxy composite plates with different fiber reinforcement angles and different widths were experimentally investigated. For this purpose, composite plates with fiber reinforcement angles of [0°]8 and [45°/-45°/0°/90°]s were prepared in 25 mm and 30 mm dimensions and kept in hot water at 40 °C, 60 °C and 80 °C for 15, 30 and 45 days. At the end of the duration, the moisture absorption rates and strengths of the specimens were obtained. The obtained data were compared among themselves and with that of dry specimens. In addition, the morphologies of the specimens were visualized with the help of Scanning Electron Microscope (SEM) and the effects of humidity and temperature on failure behavior were examined. It was determined that the strength of the [45°/-45°/0°/90°]s fiber orientations specimens was lower than the strength values obtained from the [0°]8 fiber orientations specimens. It has been determined that when the waiting time and temperature increase, the matrix/fiber structure of the specimens deteriorates and the strength values decrease accordingly.

Keywords:

Moisture effect, temperature effect, failure load, composite plate, SEM,

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