Multi step structural health monitoring approaches in debonding assessment in a sandwich honeycomb composite structure using ultrasonic guided waves

This paper aims to investigate the use of ultrasonic guided wave (GW) propagation mechanism and assessment debonding in a sandwich composite structure (SCS) using multi-step approach. Towards this, series GW propagation-based laboratory experiments numerical simulations have been carried out on SCS sample. The regions variable size locations were assessed pre-defined network piezoelectric lead zirconate transducers (PZT). Besides, several artificial masses also placed validate structural health monitoring (SHM) strategy. SHM approach uses proposed quick damage identification matrix maps an improved elliptical processing (EWP) strategy registered signals detect other damages SCS. benefit map is locate damaged area (sectors) quickly. step followed by applying localization EWP only previously identified sector region. has shown potential effectively hidden multiple with reduced number calculations step-wise that selected grid points. shows effectiveness based data gathered from experimental studies. Thus, above-mentioned debondings present within outside sensor are localized. results cross verified nondestructive testing (NDT) methods such as infrared thermography laser Doppler vibrometry.