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.
Damage localization using transient non-linear elastic wave spectroscopy on composite structures
Schadensortung bei Verbundbauteilen durch transiente nichtlineare elastische Wellenspektrometrie
International Journal of Non-Linear Mechanics ; 43 , 3 ; 217-230
2008
14 Seiten, 31 Quellen
Article (Journal)
English
Detecting damage in composite material using nonlinear elastic wave spectroscopy methods
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