Lamb Wave Based Damage Detection in Composite Panel

B Janarthan, M Mitra, P M Mujumdar


This paper presents a Lamb wave based methodology for damage detection using frequency spectra in thin metallic and composite plates and a more realistic structure like stiffened carbon-epoxy composite panel. The stiffened specimen considered encompasses almost all the complexities that may be encountered while implementing a Lamb wave based Structural Health Monitoring (SHM) system for real time applications. The complexities considered include cluttering of wave modes, reflections from the stiffeners and edges, effect of structural in-homogeneity like variable thickness on time of flight and amplitude. Thin Piezoelectric patches operating in d31 modes are used as transducers for Lamb wave generation in pitch catch configuration and excitation of A0 mode through mode tuning. A Root Mean Square Deviation Damage Index (RMSD DI) based frequency spectra is derived out of the windowed A0 mode of the Lamb wave response. The efficiency of the DI to predict damage severity is tested experimentally for different specimen with known damage location. To substantiate the experimental results, 2-D finite element (FE) simulation is carried out for different damage geometries.


Structural Health Monitoring; Composite panel; Stiffened composite panel; Lamb wave; Piezoelectric transducers

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