A research on sound insulation characteristics and processing of the embedded and co-cured composite damping structures

Abstract

According to the designable mechanical characteristics of composite structure, the ingredients of viscoelastic damping material is developed by synthetically considering the vulcanization characteristics of viscoelastic materials and the cure behaviours of epoxy resins, and 5231/EW180B glass cloth prepreg is presented here to manufacture the embedded and co-cured composite damping structure (ECCDS). A secondary vulcanization method of viscoelastic material is investigated to fabricate the experimental specimens of ECCDS. The co-cured processing of the composite material embedding viscoelastic damping membrane is explored according to the glass fabric/epoxy composite cure cycle. By using a standing wave tube method, sound insulation performance of the composite damping structure is firstly studied and compared with the composite material without the damping layer. The conclusion indicates that ECCDS has a very strong potential to insulate sound.