Abstract
Constitutive equations for geomaterials constitute a very intricate field. In the first part of this chapter, a synthetic view of constitutive formalism is presented. An intrinsic classification of all existing constitutive relations is deduced. Then examples of incrementally non-linear relations are given and some applications follow. A numerical study of the so-called “yield surfaces” is presented, and is followed by a discussion on the validity of the principle of superposition for incremental loading. Finally the question of bifurcations and instabilities in geomaterials is investigated. Essentially because of the non-associative character of geomaterial plastic strains, a large domain of failure with various modes of ruptures is exhibited.
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Darve, F., Laouafa, F. (2002). Constitutive Equations and Instabilities of Granular Materials. In: Capriz, G., Ghionna, V.N., Giovine, P. (eds) Modeling and Mechanics of Granular and Porous Materials. Modeling and Simulation in Science, Engineering and Technology. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-1-4612-0079-6_1
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DOI: https://doi.org/10.1007/978-1-4612-0079-6_1
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