Abstract
The presence of viscoelastic coatings on pipes causes a practical difficulty for performing a guided wave inspection. This is due to the fact that the coating causes attenuation of the propagating guided wave modes and decreases the signal to noise ratio of the test, sometimes to a level where testing becomes impossible. However, due to the multi-mode character of guided waves, there may be situations where propagation parameters can be chosen to overcome this problem. To explore this possibility, a theoretical model is developed for the two layer elastic/viscoelastic cylinder model. Numerical results are obtained and exhibited as phase velocity and attenuation dispersion curves. Experimental results are used to verify the behavior of the theoretical model. Data is presented using an array of low frequency, piezo-composite transducers positioned radially around the pipe.
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