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Title: A structural health monitoring approach based on contact acoustic nonlinearity and its application to quantitative evaluation of fatigue cracks
Authors: Wang, K 
Su, Z 
Keywords: Contact acoustic nonlinearity (CAN)
Fatigue crack
Second harmonic generation
Structural health monitoring.
Issue Date: 2016
Source: 8th European Workshop on Structural Health Monitoring, EWSHM 2016, 5-8 July 2016, Spain, Bilbao, p. 1-10 How to cite?
Abstract: A damage characterization approach was developed in this study by exploiting the second harmonics generated owing to the interaction between incident Lamb waves and a "breathing" crack. The approach can be expanded to deployment of structural health monitoring, whereby fatigue cracks in a plate-like structure can be evaluated quantitatively. A dedicated analytical model, in conjunction with the use of a variational principle-based method and an elasto-dynamic reciprocity method, was established. Using the model, an insight into the modulation mechanism of the crack on Lamb wave propagation was achieved, and the contact acoustic nonlinearity (CAN)-induced second harmonic generation was interrogated. Two scenarios were considered in which the plate bearing a "breathing" crack was modelled in two-dimensional and three-dimensional scenarios, respectively, yielding a quantitative correlation between crack parameters and second harmonic-based nonlinearity index. Results obtained from the proposed approach were compared with those from finite element simulation, to observe good coincidence.
ISBN: 9781510827936
Rights: All rights reserved. No part of the contents of these proceedings may be reproduced or transmitted in any form, or by any means, without written permission from the Publisher, or the authors.
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