Klepka, A., Staszewski, W.J., Uhl, T., Di Maio, D., Scarpa, F. and Tee, K.F. ORCID: https://orcid.org/0000-0003-3202-873X (2012) Impact damage detection in composite chiral sandwich panels. Key Engineering Materials, 518. pp. 160-167. ISSN 1013-9826 (Print), 1662-9795 (Online) (doi:10.4028/www.scientific.net/KEM.518.160)

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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 vibroacoustic 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 debonding 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.

Item Type:	Article
Additional Information:	[1] Paper published in Key Engineering Materials, Volume 518, 2012. Main theme Structural Health Monitoring II, edited by Tadeusz Uhl. [2] Paper first presented at the Second International Conference on Smart Diagnostics of Structures, held from 14-16 November 2011 in Cracow, Poland.
Uncontrolled Keywords:	chiral structures, impact damage detection, nonlinear acoustics, piezo-ceramic transducers
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Pre-2014 Departments:	School of Engineering School of Engineering > Department of Civil Engineering
Related URLs:	Publisher Publisher
Last Modified:	14 Oct 2016 09:24
URI:	http://gala.gre.ac.uk/id/eprint/9638

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