Among structural health monitoring techniques, nonlinear ultrasonic spectroscopy methods are found to be effective
diagnostic approach to detecting nonlinear damage such as fatigue crack, due to their sensitivity to incipient structural
changes. In this paper, a nonlinear ultrasonic modulation method was developed to detect and locate a fatigue crack on
an aluminum plate. The method is different with nonlinear wave modulation method which recognizes the modulation of
low-frequency vibration and high-frequency ultrasonic wave; it recognizes the modulation of tone burst and high-frequency
ultrasonic wave. In the experiment, a Hanning window modulated sinusoidal tone burst and a continuous
sinusoidal excitation were simultaneously imposed on the PZT array which was bonded on the surface of an aluminum
plate. The modulations of tone burst and continuous sinusoidal excitation was observed in different actuator-sensor paths,
indicating the presence and location of fatigue crack. The results of experiments show that the proposed method is
capable of detecting and locating the fatigue crack successfully.
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