Multilayer Damping Treatments: Modeling and Experimental Assessment

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Rui António Moreira (Author) Other; J. Dias Rodrigues (Author) FEUP

Journal

Title: JOURNAL OF SANDWICH STRUCTURES & MATERIALS

Vol. 12

Pages: 181-198

ISSN: 1099-6362

Publisher: SAGE Publications

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 8 Citations

Other information

Authenticus ID: P-003-8TR

DOI: 10.1177/1099636209104530

Abstract (EN): 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 multi-material 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 18