5 May 1995 Predicting the vibration characteristics of elements incorporating incompressible and compressible viscoelastic materials
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Abstract
In order to predict accurately the vibration characteristics of viscoelastic elements and viscoelastically damped structures, the use of frequency-dependent parameters such as complex modulus and Poisson's ratio is important. Several techniques have been developed for measuring the frequency-dependent complex modulus of viscoelastic materials. However, the accurate determination of Poisson's ratio of viscoelastic materials is much less developed. This quantity is important as its commonly quoted value of 0.5 can be very different when a viscoelastic material is in its transition or glassy region or if the material is compressible. In this paper, prismatic viscoelastic samples are employed to predict the value of Poisson's ratio using the finite element method (FEM). The transmissibility characteristics of these prismatic samples are established experimentally and FEM is used in conjunction with measured complex Young's modulus and iterated values of Poisson's ratio such that the predicted FEM results agree as well as possible with the experimental data. It is shown that the method suggested is able to predict accurately the Poisson's ratio of incompressible and compressible viscoelastic materials.
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Yew Wing Chan, Yew Wing Chan, S. Olutunde Oyadiji, S. Olutunde Oyadiji, Geoffrey R. Tomlinson, Geoffrey R. Tomlinson, J. R. Wright, J. R. Wright, } "Predicting the vibration characteristics of elements incorporating incompressible and compressible viscoelastic materials", Proc. SPIE 2445, Smart Structures and Materials 1995: Passive Damping, (5 May 1995); doi: 10.1117/12.208896; https://doi.org/10.1117/12.208896
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