Experimental results of Lamb wave technique investigation for evaluation of fatigue state of AA2024T3 specimens under cyclic loading conditions are presented. Analysis of acoustic signal data obtained by the piezoelectric transducers network was done through the calculation of two parameters: maximum envelope and 2nd central moment. Understanding of relations between acoustic signals features and emergent damages will provide the ability to determine the state of the structure and evaluate the defects, therefore assume the preventative measures and avoid accidents.
In the paper the results of Lamb wave ultrasonic technique for evaluation of AA2024T3 specimens during tensile testing are presented. Three piezoelectric transducers (PZT) used as an actuator and two sensors were glued on the specimen surface using epoxy adhesive. Two frequencies of testing signals (50 kHz and 335 kHz) were used. The set of static tensile tests were performed. The recorded signals were processed to calculate the informative parameters to evaluate the changes of the stress-strain state of the specimen and its microstructure.
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