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

Márcio H. de Avelar Gomes; Paulo R.O. Bonifácio; Mário O.M. de Carvalho; Hilbeth Parente Azikri de Deus

doi:10.4028/www.scientific.net/AMM.751.153

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 751A Vibro Acoustic Method for Non Destructive Test...

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

Abstract:

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.

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Periodical:

Applied Mechanics and Materials (Volume 751)

Pages:

153-158

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.751.153

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Online since:

April 2015

Authors:

Márcio H. de Avelar Gomes*, Paulo R.O. Bonifácio, Mário O.M. de Carvalho, Hilbeth Parente Azikri de Deus

Keywords:

Acoustics, Composite Panels, Non Destructive Test, Vibration

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