Enhancement of Mechanical Performance in Epoxy Adhesive Joints through Graphene Nano Oxide Particle (GNOP) Modification

Öz

This study investigates the effect of graphene nano oxide particle (GNOP) reinforcement on the bending performance of DP460 epoxy adhesive joints used for St37 steel repair. Patches were prepared at 90° and 120° wrap angles with 40, 50, and 60 mm lengths, and the adhesive was modified with 0.1, 0.2, and 0.3 wt.% GNOP. Results showed that increasing patch size and wrap angle improved bending strength up to 50%, while the 0.2 wt.% GNOP addition provided an optimal 30–35% enhancement in load capacity compared with unreinforced joints. Fracture analysis indicated a transition from cohesive to adhesive failure, confirming improved interfacial bonding and toughness due to uniform GNOP dispersion.

Anahtar Kelimeler

• Graphene nano oxide particle (GNOP)
• Epoxy adhesive
• Bending performance
• Patch repair
• Interfacial bonding

Grafen Nano Oksit Partikül (GNOP) Modifikasyonu ile Epoksi Yapıştırıcı Bağlantılarında Mekanik Performansın Artırılması

Öz

Bu çalışma, St37 çeliğinin onarımında kullanılan DP460 epoksi yapıştırıcı bağlantıların eğilme performansı üzerindeki grafen nano oksit partikülü (GNOP) takviyesinin etkisini incelemektedir. Yamalar, 40, 50 ve 60 mm uzunluklarında ve 90° ile 120° kavrama açılarına sahip olacak şekilde hazırlanmıştır. Yapıştırıcıya ise %0.1, %0.2 ve %0.3 oranlarında GNOP ilave edilmiştir. Sonuçlar, yama boyutunun ve kavrama açısının artmasının eğilme dayanımını %50’ye kadar iyileştirdiğini göstermiştir. Ayrıca %0,2 GNOP ilavesi, takviyesiz bağlantılara kıyasla yük taşıma kapasitesinde yaklaşık %30–35 oranında optimum bir artış sağlamıştır. Kırılma analizi, bağlayıcıdan bağ yüzeyine geçiş şeklinde bir kırılma davranışı sergileyerek GNOP’un homojen dağılması sayesinde ara yüzey bağlanmasının ve tokluğun arttığını doğrulamıştır.

Anahtar Kelimeler

• Grafen nano oksit partikülü (GNOP)
• Epoksi yapıştırıcısı
• Eğilme performansı
• Yama onarımı
• Ara yüzey bağlantısı

Kaynakça

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