.. _V9.01.100:

**v9.01.100** SZLZ100 - Fatigue on an off-center cycle
======================================================

**Summary:**

The purpose of this test is to calculate the damage from a history of stress loading, then from a history of deformation loading.

From a simple loading history defined by DEFI_FONCTION, the elementary cycles are extracted by the cycle counting method of RCCM [:ref:`R7.04.01 <R7.04.01>`], then the elementary damage associated with each cycle is calculated, by interpolation on the Wöhler curve of the material (if history of stress loading and by interpolation on the Manson-Coffin curve of the material) (if history of loading in deformations).

The Wöhler curve is defined by DEFI_FONCTION. The interpolation is logarithmic on the number of cycles at break :math:`N` and on the alternating stress :math:`\mathit{Salt}`.

The Manson-Coffin curve is also defined by DEFI_FONCTION.

Finally, we determine the total damage suffered by the room by adding up all the elementary damage by Miner's linear rule.

In this test, we also verify that the value of the average stress is taken into account in the calculation of the elementary damage by the Wöhler method. A first calculation is performed without correction, a second with a Gerber correction and the third with a Goodman correction.

On this simple example, the extraction of the elementary cycles and the calculation of the damage can be done manually, by applying the algorithms presented in the reference document [:ref:`R7.04.01 <R7.04.01>`].

The results provided by operator POST_FATIGUE are therefore very satisfactory.


.. 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