Jenal, R. B., Staszewski, W. J., Scarpa, F. and Tee, K.-F. ORCID: https://orcid.org/0000-0003-3202-873X (2009) Damage detection in smart chiral sandwich structures using nonlinear acoustics. In: 20th International Conference on Adaptive Structures and Technologies (ICAST), 20-22 October 2009, Hong Kong, China.

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Abstract

This paper demonstrates damage detection in a smart sandwich panel with integrated transducers. 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. Low-profile sensors and actuators are surface-bonded on the face skin of the panel. Nonlinear acoustics is applied for damage detection. The combined vibro-acoustic interaction of high-frequency ultrasonic wave and low-frequency vibration excitation leads to various nonlinear effects. The paper demonstrates that when structure is damaged, the high-frequency “weak” ultrasonic wave is modulated by the low-frequency “strong” vibration wave. As a result frequency sidebands can be observed around the main acoustic harmonic in the spectrum of the ultrasonic signal.

Item Type:	Conference or Conference Paper (Paper)
Uncontrolled Keywords:	chiral structures, damage detection, nonlinear acoustics, piezoceramic 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:	Author
Last Modified:	14 Oct 2016 09:08
URI:	http://gala.gre.ac.uk/id/eprint/3295

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