Dynamics of Viscoelastic Structures—A Time-Domain, Finite Element Formulation

[+] Author and Article Information
D. F. Golla, P. C. Hughes

Institute of Aerospace Studies, University of Toronto, Toronto, Canada M3H 5T6

J. Appl. Mech 52(4), 897-906 (Dec 01, 1985) (10 pages) doi:10.1115/1.3169166 History: Received August 01, 1984; Revised January 01, 1985; Online July 21, 2009


Mathematical models of elastic structures have become very sophisticated: given the crucial material properties (mass density and the several elastic moduli), computer-based techniques can be used to construct exotic finite element models. By contrast, the modeling of damping is usually very primitive, often consisting of no more than mere guesses at “modal damping factors.” The aim of this paper is to raise the modeling of viscoelastic structures to a level consistent with the modeling of elastic structures. Appropriate material properties are identified which permit the standard finite element formulations used for undamped structures to be extended to viscoelastic structures. Through the use of “dissipation” coordinates, the canonical “M , K ” form of the undamped motion equations is expanded to encompass viscoelastic damping. With this formulation finite element analysis can be used to model viscoelastic damping accurately.

Copyright © 1985 by ASME
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