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HomeKey Engineering MaterialsKey Engineering Materials Vol. 518Impact Damage Detection in Composite Chiral...

Impact Damage Detection in Composite Chiral Sandwich Panels

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Abstract:

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.

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Periodical:

Key Engineering Materials (Volume 518)

Pages:

160-167

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.518.160

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Cite this paper

Online since:

July 2012

Authors:

Andrzej Klepka, Wieslaw Jerzy Staszewski, T. Uhl, Dario di Maio, Fabrizio Scarpa, K.F. Tee

Keywords:

Chiral Structures, Impact Damage Detection, Nonlinear Acoustics, Piezoceramic Transducer

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