Damping analysis in flexural vibration of sandwich beams with debonding

Idriss Mahamat Moustapha , Abderrahim El Mahi (1) , Rachid El Guerjouma (1) , Olivier Dazel

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

The paper presents, an analysis of the damping of sandwich composites with debonding. These sandwich composites consist of two thin faces composed of glass fibres and epoxy resin bonded to light weight and weaker core material of PVC foams. Natural frequencies and damping parameters are investigated using beam test specimens and an impulse technique. Modelling of the damping of a sandwich composite with debonding is established considering finite element analysis which evaluated the different energies dissipated in the material directions of the core and the skins. The effects of debonding variable lengths on the natural frequencies and the damping were studied numerically and compared with experimental results. The results show that the natural frequencies and damping are sensible to debonding length. These properties offer the sensitive indicators of damage of sandwich materials during lifetime.

Mots clés: sandwich composite; Debonding; vibration; Damping

Domaines: Acoustique [physics.class-ph]

Idriss Mahamat Moustapha, Abderrahim El Mahi, Rachid El Guerjouma, Olivier Dazel. Damping analysis in flexural vibration of sandwich beams with debonding. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810879⟩