Sudden crack growth has the potential to cause catastrophic failure when a crack reaches a critical crack size.
Early detection of crack formation helps to minimize this potential. This research focuses on the use of guided
ultrasonic waves (GUWs) to detect crack formation. Experiments are conducted on test specimens in which
fatigue cracks are grown through cyclic loading. Macro Fiber Composite (MFC) and piezoelectric disc actuators
are used as sensors to induce and receive various GUWs ranging in frequency from 25 to 100 kHz. Preliminary
experimental results are given.