The efficiency of a guided wave (GW)-based Structural Health Monitoring (SHM) system should be verified under increasing geometry complexity and under the real environmental and operational conditions, following the building block approach. In this scenario, Finite Element (FE) modelling represents an effective tool to study the GW propagation for SHM applications, allowing substantially reducing experimental campaign time and costs. In this work, the effect of the curvature (characteristic for example of aircrafts, tanks, pipes) on GW propagation mechanisms was investigated through FE analyses. In particular, dispersion and slowness mechanisms were studied in flat and curved composite panels in the frequency range 100–300 kHz. The difference between the S0 mode velocities for the flat and curved plates is evident only for a low frequency (100 kHz), whilst the propagation is unaltered for higher frequencies. Specifically, for most of the frequencies (>100 kHz), S0 mode propagation speed in the flat plate is higher than the analogous in the curved plate, while concerning the A0 mode, no difference arises.
Analysis of Guided Waves Dispersive Behavior for Damage Detection in Flat and Curved Composite Panels
De Luca A.;Lamanna G.;Caputo F.
2023
Abstract
The efficiency of a guided wave (GW)-based Structural Health Monitoring (SHM) system should be verified under increasing geometry complexity and under the real environmental and operational conditions, following the building block approach. In this scenario, Finite Element (FE) modelling represents an effective tool to study the GW propagation for SHM applications, allowing substantially reducing experimental campaign time and costs. In this work, the effect of the curvature (characteristic for example of aircrafts, tanks, pipes) on GW propagation mechanisms was investigated through FE analyses. In particular, dispersion and slowness mechanisms were studied in flat and curved composite panels in the frequency range 100–300 kHz. The difference between the S0 mode velocities for the flat and curved plates is evident only for a low frequency (100 kHz), whilst the propagation is unaltered for higher frequencies. Specifically, for most of the frequencies (>100 kHz), S0 mode propagation speed in the flat plate is higher than the analogous in the curved plate, while concerning the A0 mode, no difference arises.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
