Modeling A
==============


Characteristics of modeling
-----------------------------------

Modeling COQUE_3D (TRIA7)

.. _OLE_LINK1:


.. image:: images/1000020000000800000005964CD6C3CE625F3A23.png
    :width: 4.6165in
    :height: 3.2228in


.. _RefImage_1000020000000800000005964CD6C3CE625F3A23.png:


Characteristics of the mesh
----------------------------

Number of knots: 145

Number of meshes and type: 40 TRIA7


Tested sizes and results
------------------------------

The calculation strategy used is divided into two steps:


* **Imposed load**: a disruptive load of :math:`1\mathrm{/}1000` of the critical load following :math:`X` is imposed to reveal the buckling mode. This load is applied for :math:`P\mathrm{/}{P}_{\mathit{cr}}\mathrm{=}0.98` and up to :math:`P\mathrm{/}{P}_{\mathit{cr}}\mathrm{=}1.015`.


* **Imposed displacement**: clear of 1.01, the structure has become very flexible, an increase in displacement DZ is imposed (option DDL_IMPO in STAT_NON_LINE) to determine post-buckling behavior.

Using the arc-length technique makes it difficult to define the reference value to be entered in the TEST_RESU command, since these values cannot be imposed. To define the reference values, we looked for the DZ values that were as close as possible to those listed in the [:ref:`§2.2 <§2.2>`] table and we reported the values of the control parameter and DX that we had to obtain for the DZ values in question.


.. csv-table::

    "**DZ**", "**Identification**", "**Instants**", "**Reference**"
    "—0.0150", "XX", "1.04532", "0.1100"
    "", "DZ", "1.04532", "—0.0150"
    "", "ETA_PILOTAGE ", "1.04532", "1.015"
    "", "", "", ""
    "—0.0595", "X", "1.09788", "0.2110"
    "", "DZ", "1.09778", "—0.0595"
    "", "ETA_PILOTAGE ", "1.09778", "1.063"
    "", "", "", ""
    "", "", "", ""
    "—0.22", "XX", "1.20824", "0.3595"
    "", "DZ", "1.20824", "—0.22"
    "", "ETA_PILOTAGE ", "1.20824", "1.293"
    "", "", "", ""
    "", "", "", ""
    "—0.3255", "XX", "1.2646", "0.396"
    "", "DZ", "1.26646", "—0.3255"
    "", "ETA_PILOTAGE ", "1.26646", "1.518"
    "", "", "", ""
    "", "", "", ""
    "—0.5535", "X", "1.38521", "0.375"
    "", "DZ", "1.38521", "—0.5535"
    "", "ETA_PILOTAGE ", "1.38521", "2.541"
    "", "", "", ""
    "", "", "", ""
    "—0.67", "XX", "1.46121", "0.3125"
    "", "DZ", "1.46121", "—0.67"
    "", "ETA_PILOTAGE ", "1.46121", "4.029"