.. _U3.13.05:

**u3.13.05** Models AXIS_SI, D_ PLAN_SI, C_ PLAN_SI
=========================================================

**Summary:**

The models AXIS_SI, D_ PLAN_SI, C_ PLAN_SI (Phenomenon: mechanical) correspond to finite elements whose support meshes are surface.

The suffix _SI means: Sub-Integrated: the integration of terms relating to the laws of behavior is done in a reduced way (Gauss point scheme of lower order than full integration modeling).

The modeling assumptions are as follows:


* AXIS_SI for axisymmetry (Fourier mode 0) along the :math:`Y` axis,


* D_ PLAN_SI for plane deformations,


* C_ PLAN_SI for plane constraints.

This document describes for models:


* the degrees of freedom carried by the finite elements that support modeling,


* the related support meshes,


* the loads supported,


* non-linear possibilities,


* test cases implementing the models.


.. toctree::
    :hidden:

    self

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

    Discr_tisation
    Chargements_support_s
    Possibilit_s_non-lin_aires
    Exemples_de_mise_en__uvre___cas-tests