Abstract
In this paper, an elasto-plastic constitutive model for chemical bulk solids at low stresses, developped using experimental results on two powders (organic and mineral), is presented. A first version, including a Mohr-Coulomb failure criterion with an isotropic strain-hardening rule and a non-associated plastic potential, is shown to be insufficient to reproduce experimental data, especially on stress paths involving low deviatoric stress levels like oedometric tests. In an ameliorated version of the model, a second plastic mechanism is added. It includes a purely volumic strain-hardening rule and an associated plastic potential. The model is then validated on various stress paths.
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