期刊
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
卷 43, 期 3, 页码 217-230出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijnonlinmec.2007.12.012
关键词
non-linear elastic wave spectroscopy; acoustic/ultrasonic methods; composite materials; Preisach and Mayergoyz space
类别
To reduce the costs related to maintenance of aircraft structures, there is the need to develop new robust, accurate and reliable damage detection methods. A possible answer to this problem is offered by newly developed non-linear acoustic/ultrasonic techniques, which monitor the non-linear elastic wave propagation behaviour introduced by damage, to detect its presence and location. In this paper, a new transient non-linear elastic wave spectroscopy (TNEWS) is presented for the detection and localization of a scattered zone (damage) in a composite plate. The TNEWS analyses the uncorrelations between two structural dynamic responses generated by two different pulse excitation amplitudes by using a time-frequency coherence function. A numerical validation of the proposed method is presented. Damage was introduced and modelled using a multi-scale material constitutive model (Preisach-Mayergoyz space). The developed technique identified in a clear manner the faulted zone, showing its robustness to locate and characterize non-linear sources in composite materials Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
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