Abstracto

Numerical investigation and detection of thermography.

Cindy Victoria

Vibro-thermography is a promising nondestructive testing technique owning to its full-field and defect-selective imaging which excites ultrasonic waves to locally stimulate defects in large-scale and complex shape key components. In this paper, a low-power piezoelectric transducer was used as an actuator of vibro-thermography, and the detection and quantitative evaluation of the fatigue crack in metal structure were investigated. Experiments were conducted on an aluminum plate with a prefabricated fatigue crack. Both temperature data and thermal images were analyzed to validate the proposed method. The crack length was measured from the amplitude and phase image by the fast Fourier transform. The experimental error of crack length was less than 4.3% from the phase image.