Abstract:
This debonding is a very common damage scenario in stiffened metallic plates. A number of studies have been done with different actuator-sensor arrangements for detection of debonding in such plates. The large number of sensors required and the significant data analysis is usually a challenge to their practical implementation. This work investigates the capability of a simplified actuator-sensor arrangement by placing them along the stiffener for debonding detection and quantification. Instead of scanning the entire plate, this arrangement scans only the bonding region of the stiffened panel which is very prone to damage. The analysis is based on non-linearity in a lamb-wave resulting from contact acoustic nonlinearity (can) in the debonding region - a scheme which should be simple enough for practical implementation. Numerical simulations have been carried out in the finite element package abaqus. Higher harmonic non-linearity has been observed due to the presence of debonding. A filter has been designed to extract the higher harmonics followed by hilbert transform. A damage index has been proposed for debonding detection and quantification. It has been shown that this simplified actuator-sensor arrangement and detection framework is able to detect debonding of size up to 5 mm with good prediction accuracy. © "advances in acoustics, noise and vibration - 2021" proceedings of the 27th international congress on sound and vibration, icsv 2021. All rights reserved.