Title: Inverse method for dynamic characterisation of cork compounds

Authors: R.A.S. Moreira, R. De-Carvalho

Addresses: Departamento de Engenharia Mecanica da Universidade de Aveiro, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal. ' Departamento de Engenharia Mecanica da Universidade de Aveiro, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal

Abstract: Seeking for the enhanced dynamic behaviour of light structures, damping materials have been applied in the core of sandwich panels and beams, promoting thus the inherent passive vibration control. Cork compounds have been considered as promising solutions for such applications, requiring, however, a complete description of its physical characteristics, namely its dynamic properties. Due to lack of reliable data concerning viscoelastic damping materials, and in particular cork compounds, the accurate design of such structures requires these properties to be directly identified from the target raw materials. This identification procedure is a difficult task and data obtained from usual approaches is usually misrepresented by improper boundary conditions or strain pattern assumptions. The study hereby documented intends to prove the feasibility of an identification process based on an inverse method. To accomplish this goal, sandwich beams with cork compound cores are experimentally characterised through its frequency response model, which is used as the reference for an optimised properties fitting procedure onto a sandwich beam finite element model. The proposed approach proved to provide consistent and reliable results.

Keywords: sandwich beams; cork compounds; complex modulus; material characterisation; inverse identification; passive vibration control; dynamic behaviour; viscoelastic damping; frequency response modelling; finite element method; FEM.

DOI: 10.1504/IJMATEI.2009.029366

International Journal of Materials Engineering Innovation, 2009 Vol.1 No.2, pp.254 - 275

Published online: 23 Nov 2009 *

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