A new technique in the frequency domain is presented for the characterization of a surface-breaking crack in plates. The strip element method has been used to calculate the responses of the displacement field in the plate subjected to a time harmonic line load on the upper surface of the plate. In the present technique, the crack can be located from the distribution of the displacement field, which is found to be discontinuous at the crack position. It is found that there are additional oscillations in the curve of the absolute values of the displacement in between the load and the crack. The crack length can be determined from the mean value of the peak of the additional oscillations. It is also found that the mean value of the peak is dependent on the crack length and less dependent on the distance from the load to the crack. Approximate polynomial formula of degree three for predicting the length of surface-breaking crack in isotropic homogeneous plates is also proposed. Numerical examples are given to demonstrate the present technique.
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Lam et al. (1995) studied this question.
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