Damage localization using transient non-linear elastic wave spectroscopy on composite structures

Reference:

Zumpano, G. and Meo, M., 2008. Damage localization using transient non-linear elastic wave spectroscopy on composite structures. International Journal of Non-Linear Mechanics, 43 (3), pp. 217-230.

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Official URL:

http://dx.doi.org/10.1016/j.ijnonlinmec.2007.12.012

Abstract

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

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