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A Vibro Acoustic Method for Non Destructive Test of Composite Sandwich Structures

2015; Trans Tech Publications; Volume: 751; Linguagem: Inglês

10.4028/www.scientific.net/amm.751.153

2297-8941

Márcio Henrique de Avelar Gomes, Paulo R.O. Bonifácio, Mario Olavo Magno de Carvalho, Hilbeth P. Azikri de Deus,

Geophysical Methods and Applications

The present work describes an investigation into a vibro-acoustic method to check the existence of superficial flaws in composite sandwich structures, based in a technique inspired in the well known Tap Test. In this case, however, a non-impulsive excitation is provided by an especial transducer and the acoustic response is captured with a microphone. A deconvolution technique is used in order to assess the system's impulse response and generate a “failure” map after post-processing the results. Post-processed parameters evaluated are: Loudness, Sharpness and a discrepancy indicator for the transfer function (named TFDI). Results suggest that Loudness and TFDI potentially indicate the existence of a damaged core and the lack of adhesive tape.