.. _U2.05.02:

**u2.05.02** Instructions for using the X method- FEM
=====================================================

**Summary**

The objective of this note is to provide the information necessary for a user to perform calculations with*Code_Aster* using the extended finite element method (X- FEM for eXtended Finite Element Method) [:ref:`1 <1>`].

The first part introduces the objectives of the extended finite element method and recalls the basic principles of X- FEM and level sets.

The second part introduces the possibilities and limitations of using X- FEM in*Code_Aster*.

The following three parts detail the implementation of X- FEM in*Code_Aster*, for a calculation without or with contact on the lips of the crack, then for an underthickness calculation.

Finally, the last part gives a lot of practical advice.




.. toctree::
    :hidden:

    self

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

    Introduction
    Possibilit_s_et_limites_de_X-FEM_dans_Code_Aster
    Mise_en__uvre___sans_contact_sur_les_l_vres_de_la_fissure
    Mise_en__uvre___avec_contact_sur_une_interface
    Mise_en__uvre___trou_ou_sous-_paisseur
    Conseils_et_recommandations_sur_le_maillage
    Conseils_et_recommandations_sur_l_utilisation_de_X-FEM
    Conclusions
    Bibliographie