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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 Fraddosio2, 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

Keywords

Abstract

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: http://dx.doi.org/10.17515/resm2016.73st0726                          Full Text

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31/12/2017 2017 Best Paper Award: The paper authored by Pilade Foti, Aguinaldo Fraddosio, Nicola Lepore, and Mario Daniele Piccioni  entitled as “On the mechanics of corbelled domes: new analytical and computational approaches” is awarded the 2017 Best Paper Award of Research on Engineering Structures and Materials (RESM). We congratulate the authors and wish them a continued success.


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