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Experimental validation of a numerical model predicting the propagation of acoustic emissions in a wing spar for SHM purposes

Experimental validation of a numerical model predicting the propagation of acoustic emissions in a wing spar for SHM purposes
Experimental validation of a numerical model predicting the propagation of acoustic emissions in a wing spar for SHM purposes
An established principle for detecting cracks in structures is to monitor acoustic emissions generated by microcracking. Sensors positioned remotely from the crack site can pick up disturbances due to the propagation of high frequency waves from which the existence and the location of the crack can, in principle, be determined. In the case of thick load bearing structures such as wing spars the problem is complicated by the many wave types that may be responsible for transmitting the disturbance and their differing wave speeds, decay rates and scattering properties. This paper presents experimental activities on an I-beam chosen to resemble a wing spar. A Semi-Analytical Finite Element (SAFE) model is created and used to predict the forced response in both the frequency and time domains. The predictions compare favourably with experimental results obtained up to 40 kHz for an I-beam with approximately anechoic terminations. The efficacy of the model in decomposing the response into constituent waves and therefore assess their relative contributions and times of arrival is demonstrated.
Zarini, G.
b1db9557-3733-48f9-8070-a3646691e455
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Zarini, G.
b1db9557-3733-48f9-8070-a3646691e455
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567

Zarini, G., Waters, T.P. and Elliott, S.J. (2014) Experimental validation of a numerical model predicting the propagation of acoustic emissions in a wing spar for SHM purposes. 6th World Conference on Structural Control and Monitoring (WCSCM), Barcelona, Spain. 12 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

An established principle for detecting cracks in structures is to monitor acoustic emissions generated by microcracking. Sensors positioned remotely from the crack site can pick up disturbances due to the propagation of high frequency waves from which the existence and the location of the crack can, in principle, be determined. In the case of thick load bearing structures such as wing spars the problem is complicated by the many wave types that may be responsible for transmitting the disturbance and their differing wave speeds, decay rates and scattering properties. This paper presents experimental activities on an I-beam chosen to resemble a wing spar. A Semi-Analytical Finite Element (SAFE) model is created and used to predict the forced response in both the frequency and time domains. The predictions compare favourably with experimental results obtained up to 40 kHz for an I-beam with approximately anechoic terminations. The efficacy of the model in decomposing the response into constituent waves and therefore assess their relative contributions and times of arrival is demonstrated.

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More information

Published date: July 2014
Venue - Dates: 6th World Conference on Structural Control and Monitoring (WCSCM), Barcelona, Spain, 2014-07-01
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 375737
URI: https://eprints.soton.ac.uk/id/eprint/375737
PURE UUID: 9bd5e716-b2cc-445d-aa37-adfd5f00dce9

Catalogue record

Date deposited: 16 Apr 2015 09:03
Last modified: 10 Dec 2018 17:42

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Contributors

Author: G. Zarini
Author: T.P. Waters
Author: S.J. Elliott

University divisions

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