Fig. 3

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Le critère de Mohr-Coulomb et les trois critères de Drucker-Prager correspondant aux cercles passant par les sommets internes et externes et au cercle tangent aux faces de l'hexagone.
The Mohr-Coulomb criterion and its approximations by three Drucker-Prager criteria corresponding to the circles in octahedral plane passing through the internal or the external vertices or tangent to the faces of the hexagon.
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