The monitoring of concrete buildings is important to assess their solidity and promptly intervene in case of damage. Concrete structures suffer the formation of micro-cracks and the propagation of macro-cracks, due to ageing or to mechanical stresses. These cracks are sources of acoustic emission, and can be distinguished according to the frequency and intensity of the acoustic wave they generate; thus, transducers with high sensitivity and wide bandwidth are needed. Flextensional piezoelectric transducers are known for these characteristics, which make them suitable for acoustic emission applications. For this reason, we designed a flextensional transducer optimized for acoustic emission techniques applied to concrete structures. The performance of the device in receive mode in concrete-coupled operation was investigated by running harmonic analyses on a finite element model. The geometrical parameters of the device were designed in order to obtain a broadband receive sensitivity.

An Ultrasonic Flextensional Array for Acoustic Emission Techniques on Concrete Structures

La Mura, Monica
;
Lamberti, Nicola A.;
2018

Abstract

The monitoring of concrete buildings is important to assess their solidity and promptly intervene in case of damage. Concrete structures suffer the formation of micro-cracks and the propagation of macro-cracks, due to ageing or to mechanical stresses. These cracks are sources of acoustic emission, and can be distinguished according to the frequency and intensity of the acoustic wave they generate; thus, transducers with high sensitivity and wide bandwidth are needed. Flextensional piezoelectric transducers are known for these characteristics, which make them suitable for acoustic emission applications. For this reason, we designed a flextensional transducer optimized for acoustic emission techniques applied to concrete structures. The performance of the device in receive mode in concrete-coupled operation was investigated by running harmonic analyses on a finite element model. The geometrical parameters of the device were designed in order to obtain a broadband receive sensitivity.
9781538634257
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4723987
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