Affiliations: Departamento de Engenharia Mecânica, Universidade
de Aveiro, Aveiro, Portugal | Faculdade de Engenharia da Universidade do Porto,
Porto, Portugal
Note: [] Corresponding author: Rui A. S. Moreira, Departamento de
Engenharia Mecânica, Universidade de Aveiro, Campus Santiago, 3810-193
Aveiro, Portugal. E-mail: rmoreira@ua.pt
Abstract: The design of passive damping treatments using viscoelastic
materials requires both an accurate numerical analysis approach, usually making
use of the finite element method, and a realistic means of material
description. While the former has been widely studied and several and valuable
approaches have become available during the last years, the latter is still an
issue requiring additional efforts. The experimental characterization, the data
modeling and finally the constitutive models able to be directly used along
analytic and numerical analysis, are still important research areas. Several
viscoelastic models, able to be directly applied into a finite element analysis
either in a time or in a frequency domain analysis, are available and have been
widely used during the last years in most of the published work. Despite the
general description and straightforward use that such modeling approaches may
provide, temperature effect is usually disregarded and isothermal analysis are
usually performed. Moreover, this temperature effect is naturally not directly
considered as an input parameter for most of the viscoelastic material models
and isothermal conditions are also considered in the experimental
characterization data analysis. This work presents an extended viscoelastic
model, based on well known isothermal models, where the temperature-frequency
superposition effect is directly considered. The extended model is applied to
the analysis of the experimental data using a data fitting procedure to
identify a set of global parameters able to represent the effect of the
frequency and the temperature.
