.. _V9.01.106:

**v9.01.106** SZLZ106 - Fatigue under random stress
=============================================================

**Summary:**

The aim of this test is to calculate the damage from a random solicitation which is characterized by its spectral moments.

From the spectral moments of the random loading, the average damage suffered by the structure [:ref:`R7.04.02 <R7.04.02>`] is determined.

To do this, two methods for counting stress cycles are available:


* method for counting stress peaks,


* method of exceeding a given level.

Various possibilities for introducing the Wöhler curve as well as taking into account the elasto-plastic concentration coefficient :math:`\mathrm{Ke}` are also tested.

The reference results of this test are the values provided by the POSTDAM software developed by Department REME (EDF - DER -EP).

The results provided by the operator POST_FATI_ALEA are completely identical to those provided by the POSTDAM software.


.. toctree::
    :hidden:

    self

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

    Probl_me_de_r_f_rence
    Solution_de_r_f_rence
    Mod_lisation_A
    Synth_se_des_r_sultats