Free Vibration Analysis of Laminated Composite Plate with Various Boundary Condition Using FEM

Abstract

The vibration analysis of laminated composite plates is analyzed using finite element method. A suitable finite element model is proposed and developed based on first order shear deformation theory using ANSYS parametric design language (APDL) code. The model has been developed using an appropriate eight node isoparametric element (SHELL281) from the ANSYS element library. In this paper Numerical results have been computed for the effect of material properties, thickness ratio of plate, different boundary conditions, different aspect ratio, and different angle of fiber orientation of laminated composite plate. The analysis for rectangular plate is carried out for thickness (h/b= 0.001, 0.01, 0.05, 0.1, and 0.2) and different aspect ratios (a/b=1, 1.5, 2, and 2.5). The problem of free vibration analysis of composite square plates having material properties (E11/E22= 10, 20, 30 and 40) is also considered. The natural frequencies and mode shapes are compared for different boundary condition. Comparisons are made with the result for thin and thick composite laminated plate.