Vibration Analysis of Composite plate with Central rectangular cut-out using FEM

Plate structures are important engineering substructures, especially where weight is a major consideration. Thin plate structures with arbitrary cutouts are unavoidable due to the high demand for laminates in a range of engineering applications. The existence of cutouts will alter the frequency of free vibration. FEMwas used to investigate the natural frequencies of isotropic and composite laminated plates, as well as the effects of various plate characteristics with and without cut-out. A nine-node iso-parametric element is used in the numerical analysis. The impact of the number of layers, angle of fibre orientation, width to thickness ratio, modulus ratio, and cutout size on plate natural frequencies is investigated. For various values, the nondimensional fundamental frequency of vibration is displayed.