Investigation of the Damping Properties and the Sound Insulation Performances of Fiber-reinforced Composites

Filling organic or inorganic fibers into the viscoelastic materials is a usual approach to modify their mechanical damping behaviors. The objective of this work is to study the mechanical vibration damping behavior and the sound noise reduction capability of the fiber-reinforced composite materials as well as to explore the correlation between the damping behaviors and the sound insulation performances. The samples were prepared by blending and solidification processes from ordinary commercial available damping slurries and various kinds of fiber fillers. The mechanical damping properties (including elastic modulus and loss factor) were measured by the dynamic mechanical analyzer (DMA). The sound insulation performances (indicated as acoustic transmission loss) were characterized by a sound impedance tube. The experimental results reveal that fiber fillers strongly affect the damping properties of the viscoelastic damping composites. The acoustic transmission loss curves are also affected.