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Extra info for Analyses of Sandwich Beams and Plates with Viscoelastic Cores

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2: Storage Modulus and Loss Factor Vs. frequency at temperature 20o C for the viscoelastic material 3M ISD 112. 6: The mini-oscillators mechanical analogy in GHM method 38 7 10 Expt. 7: The GHM prediction of complex shear modulus using three minioscillators 39 Chapter 3 Comparison of Analyses of Sandwich Beams The structural system under consideration in this study is a three-layer sandwich beam which is comprised of two isotropic face layers sandwiching a viscoelastic core. Although this class of sandwich structures has been investigated extensively, it is examined here because of its simplicity and importance in understanding the fundamental physics of sandwich structures incorporating a viscoelastic core.

2 Classical Damping Models Usually in engineering applications, a phenomenological approach is taken to model viscoelastic behavior. There are three classical mathematical models for viscoelastic damping. 1, elastic-type behavior of viscoelastic damping materials refers to an instantaneous incremental proportionality of stress and strain. Visco-type behavior of viscoelastic materials infers “dashpot motion”, where a component of stress is proportional to the rate of change of strain. Therefore, a number of simple one dimensional models of viscoelastic materials are based on combinations of spring and dashpot elements to represent the elastic and visco-type of motions respectively.

We will update the in-plane and bending mode shapes by directly 15 solving for the mode shapes of isotropic plate in-plane and bending vibrations using the Kantorovich variational method [30]. The Kantorovich variational method shows the equivalence of solving boundary values problem of partial differential equations (PDEs) and finding functions to minimize the integral of associated total system energy. This equivalence enable us to obtain the analytical solutions of mode shapes for in-plane and out-of-plane plate vibrations.

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