Investigation on Formability of Fiber Metal Laminates

Öz

In this study, the formability of fiber metal laminates (FML) used in aerospace industry were experimentally examined. Al5754-H22 sheets in two different thicknesses (0.6 and 1.2 mm) were used in top and bottom layers of FML specimens. Carbon fiber plates made of prepreg carbon fiber fabrics were placed in the middle layer of FML specimens. In order to examine the formability of FML materials, the specimens were formed in different bending angles. While all FML specimens with 0.6 mm Al 5754 were formed in all bending angles throughout the experiments, crack failures were observed in outer aluminum layer of the FML specimens with 1.2 mm Al 5754 at 75° and 90° bending angles. It was also reported in forming of FML specimens that the bending force value increased as the bending angle and the thickness of aluminum layer increased.

Anahtar Kelimeler

• Formability
• Fiber metal laminate
• Bending force
• Carbon fiber

Fiber Metal Laminatların Şekillendirilebilme Kabiliyetinin İncelenmesi

Öz

Bu çalışmada, havacılık sektöründe kullanılan fiber metal laminatların (FML) şekillendirilebilme kabiliyeti deneysel olarak incelenmiştir. FML numunelerin alt ve üst tabakalarında iki farklı kalınlıkta (0,6 ve 1,2 mm) Al5754-H22 sac levhalar kullanılmıştır. FML numunelerin orta tabakasında prepreg karbon elyaf kumaştan üretilen karbon elyaf plaka bulunmaktadır. FML malzemelerin şekillendirilme kabiliyetini incelemek amacıyla numuneler farklı bükme açılarında şekillendirilmiştir. Deneyler sırasında 0,6 mm Al 5754 kullanılan FML numuneler tüm bükme açılarında şekillendirilirken, 1,2 mm Al 5754 kullanılan FML numunelerin 75° ve 90° bükme testlerinde ise numunelerin dış tarafındaki alüminyum tabakasında yırtılma hasarı görülmüştür. Ayrıca FML numunelerin şekillendirilmesinde, bükme açısı ve alüminyum tabaka kalınlığının artmasıyla bükme kuvveti değerinin arttığı tespit edilmiştir.

Anahtar Kelimeler

• Şekillendirilebilirlik
• Fiber metal laminat
• Bükme kuvveti
• Karbon elyaf

Kaynakça

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