Application of cork compounds in sandwich structures for vibration damping

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2008

Autores

J. Santos Silva (Autor) Outra; R.A.S. Moreira (Autor) Outra; J. Dias Rodrigues (Autor) FEUP

Ata de Conferência Internacional

Título: 8th International Conference on Sandwich Structures, ICSS8

Páginas: 1-19

Porto, 6 a 8 de Maio de 2008

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia mecânica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia mecânica > Engenharia da vibração

Outras Informações

Abstract (EN): The remarkable damping over a broad temperature range and thermal insulation properties of cork make it an excellent material to be applied on integrated and surface damping treatments in sandwich structures improving its dynamic behavior. Experimental analysis and numerical modeling of sandwich structures with cork compound layers is therefore essential for a better understanding of the cork compound influence on the dynamic properties of a layered structure. In this paper an evaluation study on the dynamic properties of a set of sandwich plates with cork compound cores inside two aluminium faces is performed. For this purpose, three test samples were assembled following the described configuration, using cork compounds with different properties (density, granulometry and thickness). To numerically simulate these layered plates, a partial layerwise plate finite element, with a multilayer configuration, was developed and integrated in a MATLAB finite element code. The dynamic properties of the cork compounds are included in the FE model by using the material complex modulus in a direct frequency analysis procedure. For the different cork compounds hereby considered, the extensional complex modulus was previously identified by using a specific experimental methodology which simulates a semidefinite two degree of freedom system, where the cork compound test sample represents the complex stiffness. From the complex modulus data, both extensional storage modulus and loss factor of the cork compound were obtained. The experimental evaluation of the dynamic properties of the sandwich plates was performed carrying out an experimental modal analysis on each test specimen, being measured a set of mobility FRF functions. Additionally, the developed layerwise plate element was validated through the comparison between the measured driving point FRFs and the FEM predicted ones.

Idioma: Português

Tipo (Avaliação Docente): Científica