.. _R5.03.33:

**r5.03.33** Laws of plastic and viscoplastic behavior with nonlinear isotropic work hardening VMIS_ISOT_NL and VISC_ISOT_NL
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**Summary:**

This document describes the elasto-visco-plastic behavior model with nonlinear isotropic work hardening, available in a local version and with a gradient of internal variables (GRAD_VARIou GRAD_INCO). A modeling of large deformations is accessible via kinematics GDEF_LOG. The work hardening function combines several terms (an affine term, two exponential terms, a power term, a Lüders plateau) capable of covering most of the non-linear responses of a metallic material; each can easily be cancelled out, which offers a form of modularity to the behavioral relationship (for example: linear work hardening or work-hardening under power law only). Finally, the behavior can be independent of time (VMIS_ISOT_NL) or viscoplastic (VISC_ISOT_NL). In the latter case, plasticity evolves according to a Norton model in which the threshold function intervenes.


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    Domaine_d_application
    Mod_le_continu
    Int_gration_num_rique
    Bibliographie