Delaminations are one of the most common defects in composite laminates due to their relatively weak interlaminar strengths. They may arise during fabrication, such as incomplete wetting, or during service, such as low-velocity impact. The presence of delaminations may cause changes to the vibration parameters of a composite laminate, such as the natural frequency and the mode shape. In particular, delaminations reduce the natural frequency, which may cause resonance, if the reduced frequency is close to the working frequency. It is imperative that we should be able to predict the change in the frequency, as well as the mode shape, in a dynamic environment. In this paper dynamic response of composite plate with different stacking sequences and different boundary conditions with single mid-plane delamination is studied. The results of the present model agree well with the analytical and experimental data reported in the literature. Parametric studies show that the sizes and locations of the delaminations have significant effect on the natural frequencies and mode shapes.
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