Multilayer damping treatments: modeling and experimental assessment

• Type: Article in International Conference Proceedings Book
• Date: 2008

Authors

R.A.S. Moreira (Author) Other; J. Dias Rodrigues (Author) FEUP

Conference proceedings International

Title: 8th International Conference on Sandwich Structures, ICSS8

Pages: 1-13

Porto, 6 a 8 de Maio de 2008

Scientific classification

FOS: Engineering and technology > Mechanical engineering

CORDIS: Technological sciences > Engineering > Mechanical engineering > Vibration engineering

Other information

Abstract (EN): Pursuing an enhanced behavior, the current trend in the structural engineering considers the sandwich construction as an efficient solution to symbiotically associate different materials, each one having an important and specific structural contribution. The sandwich panels with viscoelastic cores, which represent the physical application of the viscoelastic integrated damping treatment concept, are a remarkable example of this property association, where the outside faces, usually made from a stiff material, guarantee the stiffness of the composite structure, whereas the viscoelastic and soft core provides the damping capability. The application of soft cores, specially the thick ones, into sandwich plates produces an important decoupling effect, leading to a significant flexural stiffness reduction of the sandwich plate, as experimental and numerical results evidence. From this observation and pursuing a solution to minimize such effect, the partitioning of the core layer into multiple layers separated by thin constraining layers is hereby considered. Taking advantage of the application of the multiple viscoelastic layers in the sandwich core, it is also analyzed the potential use of different viscoelastic materials in order to spread out the efficient temperature range of the damping treatment. To verify and evaluate the effects of the multi-layer and multi-material viscoelastic cores in sandwich panels, an experimental and a numerical study was conducted on representative specimens of these design concepts. The results achieved from this study demonstrate the applicability of the two multiple layer configurations, evidencing the effect of the partitioning procedure onto the reduction of the flexural stiffness decay and the efficient temperature range enlargement when adopting viscoelastic materials with different transition temperatures.

Language: Portuguese

Type (Professor's evaluation): Scientific