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Damage detection in smart chiral sandwich structures using nonlinear acoustics

Damage detection in smart chiral sandwich structures using nonlinear acoustics

Jenal, R. B., Staszewski, W. J., Scarpa, F. and Tee, K.-F. ORCID: 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:
Last Modified: 14 Oct 2016 09:08
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/3295

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