The flexural and compressive properties of sandwich composites with different 3D-printed core structures

Öz

In this study, different core structures are produced with polylactic acid (PLA) and carbon fiber reinforced PLA (CFR-PLA) filaments using a 3D printer with fused deposition modeling (FDM) technique. An alternative new core structure is proposed to the honeycomb and square core structures commonly used in the literature. Then, sandwich composites are produced by bonding carbon fiber-epoxy plates to the lower and upper surfaces of these core structures. The effect of carbon fiber reinforcement and core types on the mechanical properties of sandwich composites was investigated. The core structures produced with carbon fiber-reinforced PLA showed lower compressive strength but higher compressive modulus than those produced with pure PLA. Among the core structures, the designed structure showed the highest compressive strength with a value of 9.867 MPa, which is 32.18% and 54.36% higher than the honeycomb and square structure. While the flexural strength and flexural stiffness of the sandwich composites increased with carbon fiber reinforcement, the designed sandwich composite showed approximately 1.40 and 3.15 times the flexural strength of the honeycomb and square sandwich composites, respectively.

Anahtar Kelimeler

• 3D-Printed core
• Fused deposition modeling (FDM)
• Sandwich composite
• Carbon fiber-reinforced polylactic acid
• Compressive properties
• Flexural properties

Destekleyen Kurum

TUBITAK

Proje Numarası

1139B411901075

Teşekkür

The authors would like to thank for the financial support of this research to the TUBITAK (Scientific and Technological Research Council of Turkey) 2209-B University Students Research Projects Support Program (project no: 1139B411901075).

Farklı 3B-baskılı çekirdek yapılara sahip sandviç kompozitlerin eğilme ve basma özellikleri

Öz

Bu çalışmada, eriyik biriktirme yöntemi (FDM) kullanılarak polilaktik asit (PLA) ve karbon fiber takviyeli PLA (CFR-PLA) filamentlerle farklı çekirdek yapıları üretilmiştir. Literatürde yaygın olarak kullanılan bal peteği ve kare çekirdek yapılarına alternatif yeni bir çekirdek yapısı önerilmiştir. Ardından, karbon fiber-epoksi plakalar bu çekirdek yapılarının alt ve üst yüzeylerine yapıştırılarak sandviç kompozitler üretilmiştir. Karbon fiber takviyesinin ve farklı çekirdek yapılarının sandviç kompozitlerin mekanik özellikleri üzerindeki etkisi araştırılmıştır. Karbon fiber-takviyeli PLA ile üretilen çekirdek yapıların saf PLA ile üretilenlere göre daha düşük basma dayanımına ancak daha yüksek basma modülüne sahip olduğu görülmüştür. Çekirdek yapılar arasında yeni tasarlanan çekirdek yapı, 9.867 MPa değeri ile en yüksek basma dayanımı göstermiş ve bu değer, bal peteği ve kare yapılardan sırasıyla %32.18 ve %54.36 daha yüksektir. Sandviç kompozitlerin eğilme mukavemeti ve eğilme rijitliği karbon fiber takviyesi ile artarken tasarlanan sandviç kompozit, bal peteği ve kare sandviç kompozitlerin sırasıyla yaklaşık 1,40 ve 3,15 katı eğilme dayanımı göstermiştir.

Anahtar Kelimeler

• 3B-baskılı çekirdek
• Eriyik biriktirme modelleme (FDM)
• Sandviç kompozit
• Karbon fiber-takviyeli polilaktik asit
• Basma özellikleri
• Eğilme özellikleri

Proje Numarası

1139B411901075

Kaynakça

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