.. _R7.01.22:

**r7.01.22** Law of viscoplastic behavior VISC_DRUC_PRAG
==============================================================

**Summary:**

This document describes the law of viscoplastic behavior VISC_DRUC_PRAG based on the elastoplastic Drucker-Prager model and taking into account viscosity according to a Perzyna power law. Its field of application is argillite, which is the host rock for the storage concept.

The proposed model includes a single viscoplastic mechanism. The criterion collapses with the cumulative viscoplastic deformation by passing through three thresholds: elastic, peak and ultimate. The flow is not associated, the flow potential being a Drucker-Prager potential falling at three levels: elastic, peak and ultimate. Between the thresholds, the workings are linear.

This law can be used in pure mechanical modeling as it can be used in a THM modeling. It is available in 3D, plane and axisymmetric deformations. It is integrated by solving a single non-linear scalar equation.

 **Table of Contents**




.. toctree::
    :hidden:

    self

.. toctree::
    :maxdepth: 2
    :numbered:

    Notations_
    Introduction
    Formulation_du_mod_le_viscoplastique_VISC_DRUC_PRAG
    Int_gration_dans_Code_Aster
    R_sultats_d_un_essai_triaxial
    Fonctionnalit_s_et_v_rification
    R_f_rences
    Descriptif_des_versions_du_document