Laminated composite plate with high mechanical strength forms one of the main parts of the plane. These laminated composite plates get vibrated free or forced during their use. In this study, three different kinds of composite plates are used to determine the effect of elastic boundary conditions on the free vibration of the plates. The classical finite element method is used for solution. Special computer program using Matlab are utilized to obtain the solutions. It is observed that the elastic boundary condition have significant effect on the vibration of the plate. Investigation of this free vibration analysis has proved that to obtain a good design, reasonable materials based on similar analyses are to be selected.

Key words: Composite plate, finite element method, vibration analysis, elastic boundary condition.