CAM ELYAF TAKVİYELİ SANDVİÇ KOMPOZİTLERİN EĞİLME MUKAVEMETİ ÜZERİNE FARKLI KATMAN DİZİLİMLERİNİN XPS VE PET ÇEKİRDEK MALZEME ETKİSİ

Öz

Hafif yapıları ve yüksek çekme-eğme mukavemetleri sayesinde, sandviç kompozitler havacılık, otomotiv ve inşaat gibi birçok sektörde tercih edilmektedir. Bu çalışmada, cam elyaf takviyeli sandviç kompozitlerin eğilme dayanımı özellikleri incelenmiştir. Çekirdek malzemeler olarak ekstrüde polistiren (XPS) ve polietilen tereftalat (PET) kullanılmış; matris malzeme olarak ise epoksi kullanılmıştır. Sandviç kompozitler, dış yüzeylerine cam elyaflar bağlanarak esnek kalıp altında reçine infüzyon yöntemiyle üretilmiştir. Cam elyaf takviyeli epoksi malzemeden oluşan yüzey laminantları iki istifleme sırasına göre düzenlenmiştir: 0°/-45°/+45°/90° (Tip I) ve 90°/-45°/+45°/0° (Tip II). Mekanik performans değerlendirmeleri için üç noktalı eğilme testleri kullanılmıştır. Yüzey görüntülerini incelemek için stereo mikroskop analizi uygulanmıştır. Test sonuçlarına göre, Tip I numunelerinin Tip II numunelerine göre daha yüksek maksimum yüklere sahip olduğu gözlemlenmiştir; XPS Tip I 355 N (±5 N) ve PET Tip I 1375 N (±25 N) değerlerine ulaşmıştır. Ayrıca, katman ayrılması ve kohezif matris kırıkları gözlemlenmiştir.

Anahtar Kelimeler

• Sandviç Yapılar
• Esneklik
• Polistiren Köpük
• Polietilen Köpük
• Katmanlama Sırası

XPS AND PET CORE MATERIAL EFFECT WITH DIFFERENT STACKING SEQUENCE ON FLEXURAL STRENGTH OF GLASS FIBER-REINFORCED SANDWICH COMPOSITES

Öz

Sandwich composites are preferred in many sectors such as aerospace, automotive, and construction due to their lightweight nature and high tensile and flexural strength. In this study, the flexural strength properties of glass fiber reinforced sandwich composites were investigated. The core materials were used as extruded polystyrene (XPS) and polyethylene terephthalate (PET); the matrix material was epoxy. The sandwich composites were produced by resin infusion under flexible tool method by bonding them with glass fibers on the outer surfaces. Surface laminates consisting of glass fiber reinforced epoxy material were arranged according to two stacking orders: 0°/-45°/+45°/90° (Type I) and 90°/-45°/+45°/0° (Type II). Three-point bending tests were used for mechanical performance evaluations. Stereo microscope analysis was applied to examine the surface images. According to the test results, it was observed that Type I samples had higher maximum loads than Type II samples; XPS Type I reached 355 N (±5 N) and PET Type I reached 1375 N (±25 N). In addition, layer separation and cohesive matrix fractures were observed.

Anahtar Kelimeler

• Sandwich structures
• Flexure
• Polystyrene foam
• Polyethylene foam
• Stacking sequence.

Kaynakça

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