.. _V3.03.131:

**v3.03.131** SSLS131 — Optimizing the radius of curvature of bent pipes
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**Summary:**

This demo test illustrates the use of the Python language in*Code_Aster*.

The objective of this test case is to optimize the value of the radius of curvature of a pipe via a Python loop. The radius of curvature is changed iteratively. The optimal value is obtained when the maximum Von Mises stress is less than a threshold.

The Python language, in this case, tests permiteratively:


* to modify the file describing the geometry of the elbow,


* to launch GMSH in order to mesh the elbow,


* to recover the maximum Von Mises constraint,


* to evaluate a criterion for stopping iterations,


* to launch GMSH to perform interactive post-processing.

This test case takes up the problem of the forma01f test case: bent pipe, made of a linear elastic material, subjected to a force applied at its end, modelled by shell elements DKT.

**Note:**

To have interactive visualization functions, put interactive = 1 at the beginning of the command file.


.. toctree::
    :hidden:

    self

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

    Probl_me_de_r_f_rence
    Solution_de_r_f_rence
    Mod_lisation_A
    R_sultats_de_la_mod_lisation_A
    Synth_se_des_r_sultats