Mode I Interlaminar Fracture Behaviour of Carbon/Epoxy Laminated Composites under Different Temperatures

Öz

Interlaminar fracture of a laminated composite material is the damage resistance of the material to cracks located at interface. Mode I interlaminar fracture takes place and damages composites more easily than other modes since it is frictionless. In this study, the effect of ambient temperature to mod I interlaminar fracture toughness of carbon/epoxy laminate was studied. It is found out that if the ambient temperature decreases under 0oC, Mod I interlaminar fracture toughness decreases also. However fracture behavior doesn’t change and R-curve behaviors of laminates are similar under the 23oC and below. For higher ambient temperatures than 23oC, it is concluded that glass transition temperature (Tg) of epoxy matrix is key parameter and the crack doesn’t propagate if the temperature is close to Tg. Fracture characteristics of the laminate are so different under the temperatures higher than Tg.

Anahtar Kelimeler

• Carbon/epoksi,Mode I,Interlaminar fracture toughness,Effect of temperature

Karbon Lifi/Epoksi Tabakalı Kompozit Malzemelerin Farklı Ortam Şartlarındaki Mod I Kırılma Davranışı

Öz

Tabakalar arası çatlak ve kırılma, tabakalı kompozit malzemelerde çokça karşılaşılan bir hasar türüdür. Ayrılma modu tabakalar arası kırılmanın en kolay gerçekleştiği ve tabakalar arası kırılma tokluğunun en düşük olduğu kırılma modudur. Bu çalışmada 140oC ile -160oC aralığındaki ortam sıcaklıklarının karbon lifi/epoksi kompozit malzemenin Mod I tabakalar arası kırılma tokluğuna ve kırılma mekaniğine etkisi araştırılmıştır. Elde edilen bulgularda ortam sıcaklığı 0oC’nin altına düştüğünde tabakalar arası kırılma tokluğu, 23oC ortam sıcaklığındaki kırılma tokluğuna göre azalmıştır. Ancak düşük ortam sıcaklıklarındaki kırılma karakteristiği 23oC sıcaklıktaki kırılma karakteristiğine benzerdir. Yüksek ortam sıcaklıklarında ise matris malzemenin camsı geçiş sıcaklığı çatlak gelişimi için doğal bir limit oluşturmaktadır. Epoksi matrisin camsı geçiş sıcaklığına yakın sıcaklıklarda çatlak ilerlememiştir. Camsı geçiş sıcaklığının üzerindeki sıcaklıklarda ise malzemenin kırılma davranışı tamamen değişmiştir.

Anahtar Kelimeler

• Karbon/epoksi,Mod I,Tabakalar arası kırılma,Sıcaklık etkisi

Kaynakça

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