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Research Article

Evaluation of damage anisotropy induced in GFRP composite materials by an innovative ultrasonic experimental approach  

Anna Castellano1, Pilade Foti2, Aguinaldo Fraddosio*2, Salvatore Marzano2, Mario Daniele Piccioni2

1DMMM - Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Bari, Italia
2DICAR - Dipartimento di Scienze dell’Ingegneria Civile e dell’Architettura, Politecnico di Bari, Bari, Italia



Ultrasonic immersion test, 

Wave propagation,

Damage mechanics, 

Composite materials, 

Anisotropic damage

We present a theoretical and experimental approach for the characterization of the damage induced anisotropy superimposed to the constitutive anisotropy of fiber-reinforced composite materials. The theoretical model here employed has been developed in the framework of the Continuum Damage Mechanics theory and allows for determining a tensorial damage measure based on the change of the elastic moduli of the composite material. Moreover, the model is general since it is applicable independently of the fibers reinforcement nature, of the presence of cracks, interlaminar voids and delamination, of the geometry of this cracks, and from of failure mechanisms of the composite materials. We perform damage experiments by using an innovative goniometric device designed and built at our laboratory (Laboratorio “M. Salvati”), and aimed at the mechanical characterization of materials. In particular, by rotating the sample into a water tank, we measure the ultrasonic “natural” velocities of the undamaged composite material along suitable propagation directions. This allows us for classifying the degree of symmetry of the material and for determining the elastic constants, also in highly anisotropic materials. Then we measure the ultrasonic velocities of the artificially damaged composite and we determine again the elastic moduli. The comparison between the elastic moduli of the damaged and the undamaged composite allows us for the characterization of the above cited anisotropic tensorial damage measure.

 © 2017 MIM Research Group. All rights reserved.

DOI:                          Full Text


05/09/2018 Abstracted/Indexed by ProquestOur journal is started to be Absracted/Indexed by Materials Science & Engineering Database of Proquest.

15/08/2018 New Members of the RESM: New editors and editorial board members have joined the team. Our journal is stronger now with their valuable participation. See Editorial Board for new members.

07/08/2018 Citation RatioFirst 3 Volumes of our journal, with 40 articles, are cited 42 times by journals indexed in SCI-Expanded.

31/07/2018 Indexed by Ulakbim TR Index: Our journal is decided to be included in the TÜBİTAK ULAKBİM TR Index upon the number 41 decision of the relevant Committee dated at 13.04.2018.The inclusion starts with the first issue of 2016.

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