Non Destructive Testing of sandwich composites: adhesion defects evaluation; Experimental and Finite Element Method simulation comparison

Elhadji Barra Ndiaye , Hugues Duflo (1)

1 LOMC - Laboratoire Ondes et Milieux Complexes

Control and detection of defects like disbond and delamination in sandwich composite material is important today in aerospace industry. For experimental investigation, disbonding was introduced at different locations in sandwich composite by insertion of a Teflon film between honeycomb and the glue film, or by suppression of glue on small area (before curing process). The A0 Lamb mode was excited close to 100kHz frequency. The transmitted and reflected wave signals were detected by velocimetry laser after interacting with the structure, and the boundaries of the honeycomb. A Finite Element Method simulation is also computed to simulate behavior of the Lamb wave in case of disbond area. Good correlation between the experimental and FEM simulation results was observed. The results demonstrate the effectiveness of Lamb waves to detect delamination or disbonding in sandwich composite material.

Mots clés: sandwich composites; NDT adhesion; FEM simulation; A0 Lamb

Domaines: Acoustique [physics.class-ph]

Elhadji Barra Ndiaye, Hugues Duflo. Non Destructive Testing of sandwich composites: adhesion defects evaluation; Experimental and Finite Element Method simulation comparison. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810864⟩