TRABALHOS PUBLICADOS
2025 |
Damage Localization in Aluminium Structures Using SHM Envelope Indices and Finite Element Modelling Proceedings Article Reinoso, Juan Brazalez; Nabarrete, Airton Resumo | Links | BibTeX | Tags: Damage Index, Finite-Element Method, Lamb Waves, Structural Health Monitoring @inproceedings{Reinoso2025DamageLocalization,Structural Health Monitoring (SHM) based on guided ultrasonic waves has proved effective for detecting and quantifying damage in aircraft structures, yet numerical validation under realistic operating conditions is still scarce. This work combines explicit finite-element modelling with Lamb-wave excitation to replicate a benchmark experiment in a 1 mm 2024-T3 aluminium plate instrumented with a central actuator and an eight-sensor circular array. Point-mass defects of 20 g, 40 g and 60 g are introduced to emulate localised faults. Signal envelopes are extracted via the Hilbert transform and a damage index 𝑫𝒊 is defined as the first-peak attenuation relative to the pristine baseline. The numerical model reproduces the experimental amplitude-loss trend within ±3 % and captures the directional sensitivity of the antisymmetric 𝑨𝟎 mode, with maximum attenuation along the actuator-defect path. Polar plots of 𝑫𝒊 show angular lobes consistent with published data, validating the framework for severity ranking and synthetic‐data generation. The estimated damage positions matched the experimental configuration within a few millimeters, confirming the framework’s utility for directional fault localization in SHM. |