The accuracy of results is verified by comparing a single case of the current work with other previous investigations. It has been found for different boundary conditions that the rank of natural frequencies is decreased by increasing the crack ratio due to the reduction of the plate’s stiffness, whereas the crack direction has no mentioned effect for a small angle of rotation. The results were obtained by using a numerical solution of mechanical APDL from ANSYS. Assuming the cracks are profound as defects. ![]() ![]() The plate has four layers with symmetric and asymmetric lamination. In this paper, a square glass-epoxy composite plate is adopted. The study of cracks behaviour in a composite plate is of significant importance in the dynamics of the Mechanical parts in order to avoid design failures due to resonance or high amplitude vibrations.
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