Cam Fiber Takviyeli Epoksi Kompozitleri Farklı Yükleme Hızlarında Eğilme Özellikleri

Abstract

Composite materials are exposed to various loading speeds when considering the application areas. Understanding how strain rates affect the behavior of composite materials and estimating this behavior constitute one of the important work areas. In this work, glass fiber reinforced epoxy composites were produced and their mechanical behaviour under various strain rates (2.5 mm/min, 5 mm/min and 10 mm/min) was investigated. Strain rates was based on crosshead speed. Composite plates were produced by VARIM (Vacuum Assisted Resin Infusion Method). The samples were cut according to ASTM standards and then three-point bending test was applied to understand flexural behaviour of glass fiber reinforced epoxy composites. Composite plates were prepared as three different fiber orientations (0°, 45°, 90°) and the effect of different strain rates on different fiber orientations was investigated. As a result, as strain rate increases, the flexural stress increases and there is no meaningful change in the modulus of elasticity and deflection. In addition, the most affected fiber orientation is 45° fiber orientation for flexural stress.