Research on vibration behavior of hybrid laminated composite plates which cured at certain temprature and time

In this study, symmetrical laminated rectangle orthotropic that is being considered in plane tension; glass/epoxy, carbon/epoxy and carbon/epoxy hybrid composite plates with 4 different fiber directivity angle are investigated by means of their vibration behavior and their natural frequencies are studied with using Rayleigh–Ritz method algebraically and after that this result is compared with vibration analyses experiments. It is figured out that there is an average 5% deviation between algebraic results and experimental results. It is believed this deviation is the result of experimental conditions, classical lamination theory assumptions that is used to determine material properties and non-homogeneous conditions of produced material. It is concluded that the natural frequencies by means of materials, for the same methods, carbon/epoxy's natural frequency is approximately twice compared with glass-carbon/epoxy materials. Main reason of this is carbon fiber which is more rigid than glass produces a higher elastic matrix and this creates a higher vibration frequencies. In order to see the effects of fiber support angles to the vibration behaviors, hybrid composite plates made of glass-carbon/epoxy are manufactured with 0o, 15o, 30o ve 45o degrees fabric fiber and their vibration behaviors are investigated. Because of using fiber as fabric material, there is not much change occurred and the biggest change seen with 30o degree support angle.