An active–passive acoustics approach for bond-line condition monitoring in aerospace skin stiffener panels

摘要: Abstract This article demonstrates the effectiveness of acoustic nondestructive inspection methods to monitor condition bond-line in carbon fiber reinforced polymer stiffened panels. In particular, emission and guided ultrasonic waves were utilized experimentally identify onset debonding panels track its evolution under constant amplitude fatigue loading. Before testing, numerical simulations wave propagation carried out evaluate characteristics optimize placement sensors along spar. A damage index based on numerically produced was developed estimate extent which tested proved effective using actual experimental data. The subjected both quasi-static loading conditions, while continuously recording triggering at predetermined load levels. activity associated with found have a dual dominant frequency content low centroid, also confirmed wavelet analysis. view potential aerospace applications investigation presented herein, pattern recognition algorithms implemented showed great for real-time detection such damage.