Acoustic Emission of Metallic Specimen with Surface Defect During Fatigue Crack Growth

Acoustic Emission of Metallic Specimen with Surface Defect During Fatigue Crack Growth

X. Yao, B.S. Vien, N. Rajic, L.R.F. Rose, C.H.J. Davies, W.K. Chiu

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Abstract. Acoustic emission is defined as the phenomena whereby transient elastic waves are generated by the rapid release of localized sources within a material. During fatigue crack growth, the formation of new crack surfaces is associated with a sudden release of energy, which constitutes acoustic sources for acoustic emission. This paper investigates the acoustic emission signature arising from fatigue test of a metallic specimen under tensile fatigue test. In this experimental study, dog-bone aluminium alloy specimen with a surface defect was fatigued to failure. It is found that the acoustic emission characteristics are different during the propagation of surface crack, because the source is changing. The results provide a useful guide in identifying source origin based on the characteristics of the acoustic emission waveform.

Acoustic Emission, Fatigue Crack, Wave Propagation, Lamb Wave

Published online 2/20/2021, 10 pages
Copyright © 2021 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: X. Yao, B.S. Vien, N. Rajic, L.R.F. Rose, C.H.J. Davies, W.K. Chiu, Acoustic Emission of Metallic Specimen with Surface Defect During Fatigue Crack Growth, Materials Research Proceedings, Vol. 18, pp 95-104, 2021


The article was published as article 12 of the book Structural Health Monitoring

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