Najarre, I;
Kostson, E;
Fromme, P;
(2014)
Guided ultrasonic waves for the monitoring of hidden fatigue crack growth in multi-layer aerospace structures.
In:
Proceedings of SPIE.
Society of Photo-optical Instrumentation Engineers
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Abstract
Varying loading conditions of aircraft structures result in stress concentration at fastener holes, where multi-layered components are connected, possibly leading to the development of fatigue cracks. The potential of guided ultrasonic waves, propagating along large plate-like structures, for the Structural Health Monitoring (SHM) of aerospace structures has been identified. However, the sensitivity for the detection of small, potentially hidden, defects has to be ascertained. This contribution presents a study of the application of guided ultrasonic waves in multi-layered tensile specimens for the monitoring of fatigue crack growth at fastener holes in the 2nd (bottom) layer of such structures. Fatigue crack growth was monitored optically and the changes in the ultrasonic signal caused by the crack development were quantified. It was shown that hidden fatigue crack detection and monitoring using the low frequency guided waves is possible. The sensitivity and repeatability of the measurements were ascertained, having the potential for fatigue crack growth monitoring at critical and difficult to access fastener locations from a stand-off distance. The robustness of the methodology for practical in-situ ultrasonic monitoring of fatigue crack growth was discussed. © 2014 SPIE.
| Type: | Proceedings paper |
|---|---|
| Title: | Guided ultrasonic waves for the monitoring of hidden fatigue crack growth in multi-layer aerospace structures |
| Event: | Health Monitoring of Structural and Biological Systems 2014 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2046304 |
| Publisher version: | http://dx.doi.org/10.1117/12.2046304 |
| Language: | English |
| Additional information: | Copyright 2014 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1433718 |
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