Ultrasonic guided wave-based debond identification in a GFRP plate with L-stiffener

Abstract This paper presents a robust assessment of debond in glass fibre-reinforced polymer composite structure with L-stiffener attachment. Towards this, the ultrasonic guided wave (GW) propagation based laboratory experiments have been carried out on stiffened panel piezoelectric transducers for excitation GWs and scanning laser Doppler vibrometer sensing GW propagation. To study changes caused by stiffener signal processing multi-point analysis has out. The proposed methodology consists two steps. Step 1 using full wavefield root mean square energy map-based approach to check presence debond. 2 point-wise measurements localization size estimation baseline free coefficient difference algorithm (SCDA). approaches are applied an in-depth experimental signals that provide information about interaction mentioned take advantage asymmetry damage. For SCDA there is no need full-wavefield measurements, healthy case as only few measurement points can be enough such structures.