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Multilayer damping treatments: modeling and experimental assessment

¹ Departamento de Engenharia Mecânica Universidade de Aveiro (UA), Aveiro, Portugal
² Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Dr. Roberto Frias, Porto, Portugal

^* To whom correspondence should be addressed. E-mail: rmoreira{at}ua.pt.

	Abstract

The sandwich panels with viscoelastic cores, which represent the physical application of the viscoelastic integrated damping treatment concept, associate different materials, each one having a specific structural contribution, 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 multilayer and multimaterial viscoelastic cores in sandwich panels, an experimental and a numerical study were conducted on specimens representative 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 of the core onto the reduction of the bending stiffness decay and the efficient temperature range enlargement when adopting viscoelastic materials with different transition temperatures.

First published on June 12, 2009
Journal of Sandwich Structures and Materials 2009, doi:10.1177/1099636209104530


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