Experimental, analytical, and finite element vibration analyses of delaminated composite plates

The vibration of delaminated composites concerns the safety and dynamic behavior of composite structures since it is vital to the presence of delamination. In this research paper, finite element simulations, analytical simulations, and experimental work were combined to analyze the vibration behavior with different delamination sizes, stacking sequences, and boundary conditions. The finite element analysis software packages, such as Ansys and Abaqus, were used to determine the vibration response of carbon berreinforced polymer composite plates for different boundary conditions, stacking sequences, and delamination sizes. Rayleigh-Ritz method was employed to derive the governing equations and determine the natural frequencies, the results of which were computed via MATLAB. The natural frequency values for carbon ber-reinforced polymer decreased upon an increase in delamination size, depending on all boundary conditions. The higher natural frequency values were obtained for all-side clamped boundary conditions. The stacking sequence (0/90/45/90) exhibited higher natural frequency values for all-side clamped boundary conditions. The results can be regarded as a base point for a safe and reliable design of composite structures with and without delamination.