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Impact damage detection in composite chiral sandwich panels

Impact damage detection in composite chiral sandwich panels

Klepka, A., Staszewski, W.J., Uhl, T., Di Maio, D., Scarpa, F. and Tee, K.F. (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:
Last Modified: 14 Oct 2016 09:24
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/9638

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