Abstract
Nonlinear viscoelastic media are investigated within the framework of the group analysis. By requiring the governing system of equations to be invariant under the dilatation group, some classes of material response functions are characterized. Furthermore several sets of self-similar solutions to the model of interest are determined. Finally for the Maxwell media wave propagation into a non constant state described by a similarity solution is studied and the occurrence of a shock wave is considered.
Riassunto
Si considera un modello per i mezzi viscoelastici non lineari nell'ambito dell'analisi gruppale. Richiedendo che il sistema di equazioni di interesse sia invariante rispetto al gruppo di dilatazione, si caratterizzano delle classi di funzioni di risposta per il materiale. Inoltre si determinano diverse soluzioni di similarità. Successivamente nel caso dei mezzi di Maxwell si studia la propagazione di onde di discontinuità in uno stato non costante descritto da una soluzione di similarità. Infine si discutono le condizioni per l'esistenza di un tempo critico a cui un'onda d'urto può formarsi.
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Fusco, D., Palumbo, A. Similarity solutions and model constitutive laws to viscoelasticity with application to nonlinear wave propagation. Z. angew. Math. Phys. 40, 78–92 (1989). https://doi.org/10.1007/BF00945311
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DOI: https://doi.org/10.1007/BF00945311