Acousto-Ultrasonic Evaluation of Adhesively Bonded CFRP-Aluminum Joints

초록

Correlation between the amount of artificial defects in bonded region and the acousto-ultrasonic parameters (AUPs) including signal amplitude and then the static strength of adhesively bonded joints of carbon-fiber reinforced plastic(CFRP) laminates and Al6061 plates has been investigated. With increasing fraction of defects, the signal amplitude and AUP1 were decreased whereas AUP2 was increased. This result has been attributed to the energy transfer characteristics of bonded joints with delamination-type defects and the change of spectral content due to the defects. considering the nature of high attenuation, a pulse signal with major frequency content at the third harmonic of thickness mode resonance, 650kHz for the dimension of specimens used in this study, has been found optimal for acousto-ultrasonic testing of CFRP-aluminum joints.