Impact Damage Detection in Composite Chiral Sandwich Panels

This paper demonstrates impact damage detection in a composite sandwich panel. The panel is built from a chiral honeycomb and two composite skins. Chiral structures are a subset of auxetic solids exhibiting counterintuitive deformation mechanism and rotative but not reflective symmetry. Damage detec...

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Bibliographic Details
Published in:Key engineering materials 2012-07, Vol.518, p.160-167
Main Authors: Scarpa, Fabrizio, Staszewski, Wieslaw Jerzy, di Maio, Dario, Tee, K.F., Klepka, Andrzej, Uhl, T.
Format: Article
Language:English
Subjects:
Acoustics
Excitation
Impact damage
Nonlinearity
Panels
Sandwich construction
Ultrasonic testing
Vibration
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Summary:This paper demonstrates impact damage detection in a composite sandwich panel. The panel is built from a chiral honeycomb and two composite skins. Chiral structures are a subset of auxetic solids exhibiting counterintuitive deformation mechanism and rotative but not reflective symmetry. Damage detection is performed using nonlinear acoustics,involves combined vibro-acoustic interaction of high-frequency ultrasonic wave and low-frequency vibration excitation. High-and low-frequency excitations are introduced to the panel using a low-profile piezoceramic transducer and an electromagnetic shaker, respectively. Vibro-acoustic modulated responses are measured using laser vibrometry. The methods used for impact damage detection clearly reveal de-bonding in the composite panel. The high-frequency weak ultrasonic wave is also modulated by the low-frequency strong vibration wave when nonlinear acoustics is used for damage detection. As a result frequency sidebands can be observed around the main acoustic harmonic in the spectrum of the ultrasonic signal.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.518.160