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On hyperbolicity of the dynamic equations for plastic fluid-saturated solids

Osinov, Vladimir A. 1
1 Institut für Bodenmechanik und Felsmechanik (IBF), Karlsruher Institut für Technologie (KIT)

Abstract:
The paper deals with the analysis of hyperbolicity of the dynamic equations for plastic solids, including one-phase solids and porous fluid-saturated solids with zero and nonzero permeability. Hyperbolicity defined as diagonalizability of the matrix of the system is necessary for the boundary value problems to be well posed. The difference between the system of equations for a plastic solid and the system for an elastic solid is that the former contains additional evolution equations for the dependent variables involved in the plasticity model. It is shown that the two systems agree with each other from the viewpoint of hyperbolicity: they are either both hyperbolic or both non-hyperbolic. Another issue addressed in the paper is the relation between hyperbolicity and the properties of the acoustic tensor (matrix). It remained unproved whether the condition for the eigenvalues of the acoustic matrix to be real and positive is not only necessary but also sufficient for hyperbolicity. It is proved in the paper that the equations are hyperbolic if and only if the eigenvalues of the acoustic matrix are real and positive with a complete set of eigenvectors. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000133658
Veröffentlicht am 09.06.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bodenmechanik und Felsmechanik (IBF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0939-1533, 0020-1154, 1432-0681
KITopen-ID: 1000133658
Erschienen in Archive of Applied Mechanics
Verlag Springer
Band 91
Heft 7
Seiten 3327–3339
Nachgewiesen in Dimensions
Web of Science
Scopus
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