Özet:

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: