Interaction of fundamental Lamb modes with a point impact damaged zone in composite plates

Dilbag Singh (1) , Rachid El Guerjouma (2) , Mourad Bentahar (2)

1 LMP - Laboratoire de Mécanique Physique
2 LAUM - Laboratoire d'Acoustique de l'Université du Mans

Due to high specific strength and stiffness for low weight, composite materials are increasingly used in modern industry. However, one weakness of such materials is their sensitivity to impacts, which may cause severe and harmful damages. The crack-like defects created by impacts may lead to local decays in composites properties, i.e., in the vicinity of the impacted zone. Furthermore, the angular spreading of the shock wave produced by the point impact makes the conical shape of impact damage. In this work, we study the interaction behavior of A0 and S0 Lamb waves with a conical damaged zone created during a point impact on the surface of a carbon fiber reinforced composite (CFRC) plate. A 3-Dimensional Finite Element model is used to simulate the scattering by the damaged zone of the above mentioned guided modes. The damaged zone inside the composite plate has been modeled as a conical shaped geometry with decayed material stiffness properties. The directivity pattern of the scattered field for the A0 and S0 modes are predicted from 3D Finite Element simulations and plotted graphically for various positions of the defect. The results will be used as a basis for the quantification of the detection sensitivity for impact zones in CFRC using guided wave sensors.

Mots clés: Composite; Guided waves; Impact damage; Localization

Domaines: Acoustique [physics.class-ph]

Dilbag Singh, Rachid El Guerjouma, Mourad Bentahar. Interaction of fundamental Lamb modes with a point impact damaged zone in composite plates. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811116⟩