Nondestructive evaluation has been playing a critical role in durability and reliability assessment of advanced composite structures. In the present paper, vibration pattern imaging technique and finite element method were applied to characterize the dynamic response of the rectangular composite laminates with through-the-width delamination. A simple delamination model for finite element analysis was proposed and applied to the analysis of the eigenfrequency and model pattern of the delaminated specimen. A Laser Doppler vibrometer was applied as a non-contacting transducer for the measurement of vibration of a specimen. The agreement between the numerical and experimental results was excellent and the results indicated that the size of the delamination has an obvious effect upon the eigenfrequency and the model patterns.
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Kimpara et al. (1994) studied this question.