New Enhanced Acoustic Damping Composite Material for the Aeronautics Industry

Abstract

The present article investigates an innovative structural composite material concept with the additional functionality of acoustic damping. It is achieved by introducing an embedded elastomeric layer within the composite laminate, which constitutes a constrained layer damping (CLD) system. The main objective is to increase the acoustic performance of the baseline material, while its mechanical properties are maintained. In addition, material processability and inspectability have been considered as important drivers for the technology development. In order to identify the most promising candidate, a set of alternatives has been explored and analysed, giving rise to a compromise solution between the enhanced acoustic performance and the structural properties of the baseline material.

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References

[1] ISO 16940. Glass in building glazing and airborne sound insulation. Measurement of the mechanical impedance of laminated glass: 2008. Standard commonly known as Centre Impedance Method or Modified Oberst Test.

[2] EN2562. Aerospace series. Carbon fibre reinforced plastics. Unidirectional laminates flexural test parallel to the fibre direction.