Abstract (EN):
This is the second of two companion articles addressing an integrated study on
the mathematical modeling and assessment of the efficiency of surface mounted or embedded
viscoelastic damping treatments, typically used to reduce structural vibration and/or noise radiation
from structures, incorporating the adequate use and development of viscoelastic (arbitrary
frequency dependent) damping models, along with their finite element (FE) implementation,
and the experimental identification of the constitutive behavior of viscoelastic materials. In the
first article [Vasques, C.M.A. et al., Viscoelastic damping technologies–Part I: Modeling and
finite element implementation, Journal of Advanced Research in Mechanical Engineering 1(2):
76-95 (2010)] viscoelastic damping has been tackled from a mathematical point of view and the
implementation, at the global FE model level, of time and frequency domain methods, namely
the internal variables models, Golla-Hughes-McTavish (GHM) and anelastic displacement fields
(ADF), and the complex modulus approach based ones, direct frequency response (DFR),
iterative modal strain energy (IMSE) and an iterative complex eigensolution (ICE), respectively,
were described and formulated. This second article is a natural extension of the first one. It
presents a generic methodology to identify the complex shear modulus of viscoelastic materials.
In this case, the complex shear modulus of the well-known viscoelastic material 3M ISD112 is
identified and up-to-date values for this material are used and curve-fitted in order to obtain
the modeling parameters of the GHM and ADF models. Afterward, a viscoelastic sandwich
(three-layered) plate specimen and the correspondent FE model are considered numerically and
experimentally. Measured and predicted frequency response functions (FRFs) are compared with
the purpose of assessing the performance of the damping models presented in the companion
article. The analysis allows to assess the validity of the methodology to determine the frequency
dependent complex modulus, the GHM and ADF parameters identification procedure and
the outcomes and drawbacks of the DFR, IMSE, ICE, GHM and ADF viscoelastic damping
modeling strategies and their FE implementations, with the aim of assisting structural designers
in the selection of the most appropriate viscoelastic damping modeling approach for their specific
needs.
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Contacto:
jdr@fe.up.pt