Parameter Estimation Using the Quasi-Linear Viscoelastic Model Proposed by Fung

[+] Author and Article Information
L. J. M. G. Dortmans, A. A. H. J. Sauren, E. P. M. Rousseau

Eindhoven University of Technology, Department of Mechanical Engineering, Eindhoven, The Netherlands

J Biomech Eng 106(3), 198-203 (Aug 01, 1984) (6 pages) doi:10.1115/1.3138483 History: Received August 05, 1983; Revised December 27, 1983; Online June 15, 2009


Using the quasi-linear viscoelastic model proposed by Fung for the description of the viscoelastic properties of soft biological tissues, the parameters governing their time-dependent behavior are commonly estimated from relaxation experiments. Exact quantification is possible from the response to a step change in the strain. Since it is physically impossible to realize a true step change in the strain, in practice the response to a steplike strain change is used. In the present study the discrepancies between the exact and the estimated parameter values are investigated using a hypothetical quasi-linear viscoelastic material. The parameter τ1 , governing the fast viscous phenomena, is found to be subject to the largest errors. Methods for obtaining better estimates of τ1 are outlined in a number of special cases.

Copyright © 1984 by ASME
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