Polymer concrete damage characterization using coda wave interferometry (CWI) and linear resonance

Souad Toumi , Mourad Bentahar (1) , Charfeddine Mechri , Fouad Boubenider , Rachid El Guerjouma (1)

1 LAUM - Laboratoire d'Acoustique de l'Université du Mans

This work aims to develop an experimental method, which is able to detect the presence of damage in mesoscopic materials using multi-scattered acoustic waves. In particular, we use the coda wave interferometry (CWI) technique in order to detect and locate damage in polymer concrete samples. Concrete samples are locally damaged using quasi-static bending tests. In order to characterize damage, we have experimentally determined nonlinear threshold at resonance (bending resonance modes). Afterward, CWI is applied in the absence and in the presence of the generated linear resonances. Experiments show that CWI doesn’t detect any damage even when the excitation level is increased. This result has been confirmed when the acoustic path is parallel and perpendicular to the created bending. However, the presence of linear resonances revealed to be interesting. Indeed, at the same drive levels when CWI is applied simultaneously with the linear resonance, we notice an important sensitivity to damage. Finally, by tracking the effect of damage on the recorded signals along the damaged samples, the proposed original combination offers the possibility to locate damage.

Domaines: Acoustique [physics.class-ph]

Souad Toumi, Mourad Bentahar, Charfeddine Mechri, Fouad Boubenider, Rachid El Guerjouma. Polymer concrete damage characterization using coda wave interferometry (CWI) and linear resonance. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811120⟩