@inproceedings{7345d01c16c64a36826cac6fd1694848,
title = "Impact damage detection in composite chiral sandwich panels",
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.",
keywords = "Chiral structures, Impact damage detection, Nonlinear acoustics, Piezo-ceramic transducers",
author = "A. Klepkal and Staszewski, \{W. J.\} and T. Uhl and \{Di Maio\}, D. and F. Scarpa and Tee, \{K. F.\}",
year = "2012",
doi = "10.4028/www.scientific.net/KEM.518.160",
language = "English",
isbn = "9783037854433",
series = "Key Engineering Materials",
publisher = "Trans Tech Publications Ltd",
pages = "160--167",
booktitle = "Structural Health Monitoring II",
note = "2nd International Conference on Smart Diagnostics of Structures ; Conference date: 14-11-2011 Through 16-11-2011",
}