Application of cork compounds in sandwich structures for vibration damping

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

Authors

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

Conference proceedings International

Title: 8th International Conference on Sandwich Structures, ICSS8

Pages: 1-19

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): 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.

Language: Portuguese

Type (Professor's evaluation): Scientific