Abstract
In this paper we investigate a general class of linear viscoelastic models whose creep and relaxation memory functions are expressed in Laplace domain by suitable ratios of modified Bessel functions of contiguous order. In time domain these functions are shown to be expressed by Dirichlet series (that is infinite Prony series). It follows that the corresponding creep compliance and relaxation modulus turn out to be characterized by infinite discrete spectra of retardation and relaxation time respectively. As a matter of fact, we get a class of viscoelastic models depending on a real parameter \(\nu > -1\). Such models exhibit rheological properties akin to those of a fractional Maxwell model (of order 1/2) for short times and of a standard Maxwell model for long times.
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Notes
For sake of completeness, it is possible to give some functional bounds for these ratios of Bessel functions, in the Laplace domain (see e.g. [7]).
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Acknowledgments
The work of A.G. and F.M. has been carried out in the framework of the activities of the National Group of Mathematical Physics (GNFM, INdAM).
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Colombaro, I., Giusti, A. & Mainardi, F. A class of linear viscoelastic models based on Bessel functions. Meccanica 52, 825–832 (2017). https://doi.org/10.1007/s11012-016-0456-5
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DOI: https://doi.org/10.1007/s11012-016-0456-5