Vibration Analysis of Laminated Composite Plates with Delamination Damage

Delamination damage is a prevalent form of damage observed in laminated composite plates, and its presence can significantly impact the vibration characteristics of the plate. This paper presents a numerical model based on the finite element method for analyzing the vibration behavior of laminated composite plates with delamination damage. A cohesive zone model is employed to simulate the delamination damage, assuming its distribution across the plate's thickness. The model enables the determination of natural frequencies and mode shapes of the plate. The study investigates the effects of delamination size and location on the vibration characteristics of the plate. The numerical results demonstrate that the presence of delamination can indeed influence the plate's vibration behavior. Specifically, as the size and location of the delamination increase, the natural frequencies of the plate decrease. Additionally, the mode shapes of the plate exhibit significant changes due to the delamination, resulting in large displacements within the delaminated regions. Notably, the study reveals that the mode shapes of the plate are more sensitive to changes in the location of the delamination rather than its size.Overall, the proposed numerical model serves as a valuable tool for analyzing laminated composite plates with delamination damage. It facilitates the prediction of vibration characteristics under various delamination scenarios and supports the design and optimization of laminated composite structures to enhance vibration performance.