Farklı Çevresel Şartlarda İki Eksenli Yüklemelere Maruz Tabakalı Kompozit Malzemelerin Hasarı

Öz

Polimer matrisli tabakalı kompozit malzemelerin bileşenlerinin dayanım yönünden çok farklı olması bu malzeme grubunun hasar analizlerini zorlaştırmaktadır. Tabakalı kompozitlerin hasar analizleri için önerilen birçok hasar ölçütü bulunmaktadır. Bu çalışmada iki yönde düzlemsel yayılı yüke ve bir yönde yayılı yük ile kayma yüküne maruz S-cam lifi/epoksi ve karbon lifi/epoksi tabakalı kompozit malzemelerin Tsai-Wu ve Puck ölçütüne göre hasarı araştırılmıştır. Birçok yükleme halinde Puck ölçütü daha güvenli hasar zarfları göstermektedir. Ancak hangi hasar ölçütünün daha güvenli olduğu tabakalı kompozit malzemelerin türüne, çevresel şartlara, takviye lif açılarına ve yüklemenin işaretine göre farklılıklar göstermektedir. Her iki malzeme türünün hem açılı hem de çapraz katlı tasarımları için tüm iki eksenli yüklemelerde malzeme dayanımını en çok düşüren etken ortam nemidir. S-cam lifi/epoksi tabakalı kompozitlerde Puck ölçütü ile oluşturulan hasar zarfları ortam sıcaklığından daha fazla etkilenirken, karbon lifi/epoksi tabakalı kompozit malzemelerde Tsai-Wu ölçütü ortam sıcaklığı değişimine karşı daha duyarlı davranış göstermiştir.

Anahtar Kelimeler

• Tabakalı kompozitler
• İki eksenli yükleme
• Çevresel şartlar
• Hasar zarfları

Damage of Laminated Composite Materials Exposed to Biaxial Loads in Different Environmental Conditions

Öz

The fact that the components of the polymer matrix laminated composite materials are very different in terms of strength makes the damage analysis of the materials difficult. There are many damage criteria recommended for damage analysis of laminated composites. In the present study, the damage of S-glass fiber/epoxy and carbon fiber/epoxy laminated composite materials subjected to planar distributed loads in two directions and also a planar distributed load with shear load was investigated according to Tsai-Wu criterion and Puck criterion. Puck criterion indicates more conservative damage envelopes in many loading cases. However, which of the criterions is more conservative varies according to the type of laminated composite materials, environmental conditions, orientation of fiber reinforcements and the sign of loading. For both the angle-ply and cross-ply stacking of both the laminated composite materials, it is the ambient humidity that decreases the material strength the most in all biaxial loadings. For the S-glass fiber/epoxy laminated composites, failure envelopes created by the Puck criterion were affected more by ambient temperature, while for the carbon fiber/epoxy layered composites Tsai-Wu criterion showed more sensitive behavior due to ambient temperature changes.

Anahtar Kelimeler

• Laminated composites
• Biaxial loading
• Environmental conditions
• Failure envelopes

Kaynakça

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