Abstract
We investigate propagation of waves in the Zener-type viscoelastic media through a model which involves fractional derivatives with a regular kernel. The restrictions on the coefficients in the constitutive equation that follow from the weak form of the dissipation principle are obtained. We formulate a problem of motion of a spatially one dimensional continuum in a dimensionless form. Then, it is considered in the frame of distribution theory. The existence and the uniqueness of a distributional solution as well as the analysis of its regularity are presented. Numerical results provide the illustration of our approach.
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Notes
Recall that \(AC([0,\infty ))\) consists of continuous functions y having locally integrable derivatives (\(dy/dt=y^{(1)}\in L^1_{loc}([0,\infty )).\)
Since \(\sigma =\varSigma +\varepsilon\), with (19), the stress strain relation (1) becomes
$$\begin{aligned} \sigma (x,t)=\int _{-\infty }^{\infty }{\mathcal {F}}^{-1}\left[ \varPhi \left( \omega \right) \right] \left( t-\tau \right) \frac{\partial \varepsilon \left( x,\tau \right) }{\partial \tau }d\tau +\varepsilon (x,t), \end{aligned}$$which shows nonlocality of constitutive equation (1) with fractional derivative (3).
We note that our definition of the Laplace transform differs from the one in [29] up to the rotation with the angle \(\pi /2\).
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This research was supported by the Serbian Academy of Sciences and Arts (TMA) and Serbian Ministry of Science Grants TR32035, III44003 (MJ) and 174024 (SP).
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Atanacković, T.M., Janev, M. & Pilipović, S. Wave equation in fractional Zener-type viscoelastic media involving Caputo–Fabrizio fractional derivatives. Meccanica 54, 155–167 (2019). https://doi.org/10.1007/s11012-018-0920-5
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DOI: https://doi.org/10.1007/s11012-018-0920-5