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New approach for the damage mechanisms identification in the glass-epoxy composites

Auteurs : A.Satour, S.Montrésor, M.Bentaharb, F.Boubeniderc and R. Elguerjouma
Année : 2012
Domaine : Sciences des matériaux
Type : Communication
Conférence: Acoustics 2012 Nantes Conference
Résumé en PDF : (résumé en pdf)
Fulltext en PDF : (.pdf)
Mots clés : acoustic emission, wavelet transforme, damage mechanisms

Résumé :

The aim of this work is to introduce a new approach for clustering acoustic emission data occuring during the fracture process of glass fibre reinforced polymer (GFRP) plates. In particular, we have developed signal processing techniques based on continues wavelet transform (CWT) in order to isolate acoustic signature corresponding to each damage mechanism (fibre breakage, matrix cracking, etc.). Entropy criterion was used to provide selection of most significant wavelet coefficients of AE signals. Models are established in the form of dictionaries, whose elements are the waveforms collected during specific experiments in which the created damage mechanisms are well known. Dictionaries should be used to classify acoustic emission signals recorded when polymer composites are under load.