Strengthening of Secondary-Bonded Carbon Fiber/Epoxy Joints via Interfacial Reinforcement with Non-woven Thermoplastic Veils
2026 11th International Conference on Recent Advances in Air and Space Technologies (RAST), İstanbul, Türkiye, 13 - 15 Mayıs 2026, ss.1-5, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Doi Numarası: 10.1109/rast69551.2026.11672627
- Basıldığı Şehir: İstanbul
- Basıldığı Ülke: Türkiye
- Sayfa Sayıları: ss.1-5
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
This study investigates a refined methodology for enhancing the mechanical performance of secondary-bonded carbon fiber reinforced epoxy composites by incorporating non-woven veils directly into the bondline. While adhesive bonding offers superior load distribution compared to traditional mechanical fastening, the inherent brittleness of epoxy adhesives often leads to suboptimal joint strength. To address this, lap-shear specimens were manufactured according to ASTM D5868 and reinforced with two different types of thermoplastic veils: Nylon PA-66 and PET. Mechanical testing and high-speed camera analysis revealed that the PA-66 veil increased lap-shear strength (LSS) by 12.7% compared to baseline specimens, whereas the PET veil resulted in a 21.9% decrease in strength. These findings demonstrate that Nylon PA-66 veils can effectively toughen bondlines and improve the load-carrying capacity of aerospace-grade bonded assemblies, while PET veils may negatively impact interfacial adhesion.