.. _U3.11.06:

**u3.11.06** Models TUYAU_3M and TUYAU_6M
===============================================

**Summary:**

This document describes for models TUYAU_3M and TUYAU_6M:


* 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.

The models TUYAU_3M and TUYAU_6M correspond to a formulation of linear elements of straight or curved pipes, which rely on Timoshenko beam kinematics for the movements and rotations of the average fiber and on a shell kinematics for the deformations of the cross section (ovalization, warping, swelling). These transverse deformations are broken down into Fourier series. Modeling TUYAU_3M takes into account a maximum of 3 modes, while modeling TUYAU_6M takes into account 6 Fourier modes.

These models can be used for three-dimensional pipe problems in linear or non-linear mechanical analysis and in small displacements.




.. toctree::
    :hidden:

    self

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

    Discr_tisation
    Affectation_des_caract_ristiques
    Chargements_support_s
    Possibilit_s_non-lin_aires
    Exemples_de_mise_en__uvre___cas-tests