.. _D5.04.01:

**d5.04.01** Introduce new behavior
===============================================

**Summary:**

How do you introduce new behavior?

Here we describe the addition of a new behavior to solve a non-linear problem posed on a structure, with STAT_NON_LINE or DYNA_NON_LINE, for all 2D/3D elements (and shells, pipes, multi-fiber beams,...) or add a new metallurgical behavior in CALC_META.

**Essential steps:**


* Writing reference documentation R (equations of the law of behavior)


* Modification of the DEFI_MATERIAU catalog (material parameters of the law of behavior)


* Addition of the Python catalog of the behavior relationship


* Choice of the integration method among the following possibilities:


* writing a standalone routine lc0nnintegrating the behavior into an integration point


* explicit integration (ALGO_INTE =' RUNGE_KUTTA ') and writing associated routines


* implicit integration into the environment PLASTI, "complete" implementation (ALGO_INTE =' NEWTON ')


* implicit integration into the environment PLASTI, "easy" implementation (ALGO_INTE =' NEWTON_PERT ')


* Produce tests!

**Note**: it is also possible to program laws of behavior either in an *Umat* routine (cf. [:external:ref:`U2.10.01 <U2.10.01>`]), or using *MFront* (cf. [:external:ref:`U2.10.02 <U2.10.02>`] and paragraph :ref:`6 <RefHeading__3104_1935928862>` of this document).

 **Table of Contents**




.. toctree::
    :hidden:

    self

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

    Sch_ma_g_n_ral_de_r_solution_dans_STAT_NON_LINE
    Documentation_de_R_f_rence_et_choix_de_la_m_thode_d_int_gration
    Mode_op_ratoire___les_catalogues
    D_formation_en_entr_e_de_la_loi_de_comportement
    Mode_op_ratoire___les_routines____crire
    Cas_particulier_des_lois_MFront
    Cas_des_lois_de_comportement_m_tallurgique__CALC_META_
    Validation_et_maintenance