1Laboratory for Experimental Physics, Rijksuniversitair Centrum Antwerpen, Groenenborserlaan, 171, B-2020 Antwerpen, Belgium
A viscoelastic model based on the material structure of soft biological tissue is proposed and a corresponding non-linear viscoelastic constitutive equation is derived. It is shown how the relaxation spectrum H(τ) may be derived using only the fundamental Fourierterm of the stress corresponding with harmonic strain oscillation.
The numerical determination of the parameters of the model, based upon a maximum likelihood method applied to a bivariate normal distribution, is shortly discussed.