C modeling
==============


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

It is a modeling in plane deformations (D_ PLAN). The master and slave surfaces are compliant.

Young's modulus :math:`{E}_{1}\mathrm{=}{E}_{2}` and Poisson's coefficients :math:`{\nu }_{1}\mathrm{=}{\nu }_{2}` are :math:`1.0E9\mathit{Pa}` and :math:`0.2` respectively. The pressure applied to the edge of the outer ring is :math:`1.0E7+\mathrm{10E5.cos}(2\theta )(\mathit{Pa})`, :math:`\theta` being the polar angle.

The outer ring defines the master surface.


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

The mesh (Figure 4.2-1) includes:


* 480 SEG3 meshes;


* 2640 QUAD8 meshes.


.. image:: images/1000000000000377000003178AD7B902CE1F37F4.png
    :width: 2.9925in
    :height: 2.6681in


.. _RefImage_1000000000000377000003178AD7B902CE1F37F4.png:

**Figure** 5.2-a **: The C modeling mesh**

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

Note :math:`\lambda` the contact pressure calculated analytically, :math:`({U}_{x},{U}_{y})` the displacements calculated analytically.

In the case where the displacements are zero, an absolute tolerance equal to 2% of the value of the maximum radial displacement Urmax=5.5E-03 is defined.

The contact pressure (LAGS_C) and the components of the displacement in the plane (X, Y) (DX, DY) are calculated for the nodes with the following coordinates:


* N9 (0.6, 0.0)


* N10 (0.0, 0.6)


* N11 (-0.6, 0.0)


* N12 (0.0, -0.6)


* N587 (4.24264068712436E-01, 4.24264068711421E-01)


* N726 (-4.24264068711421E-01, 4.24264068712436E-01)


* N865 (-4.24264068712436E-01, -4.24264068711421E-01)


* N1004 (4.24264068711421E-01, -4.24264068712436E-01)


.. csv-table::

    "**Identification**", "**Reference**", "**Aster**", "**tolerance**"
    "LAGS_C at node 9"," :math:`\lambda (x,y)` ", "Analytics", "2.10-2"
    "DX at node 9"," :math:`{U}_{x}(x,y)` ", "Analytics", "2.10-2"
    "DY at node 9"," :math:`{U}_{y}(x,y)` ", "Analytics", "2.10-2"
    "LAGS_C at node 10"," :math:`\lambda (x,y)` ", "Analytics", "2.10-2"
    "DX at Node 10"," :math:`{U}_{x}(x,y)` ", "Analytics", "2.10-2"
    "DY at node 10"," :math:`{U}_{y}(x,y)` ", "Analytics", "2.10-2"
    "LAGS_C at node 11"," :math:`\lambda (x,y)` ", "Analytics", "2.10-2"
    "DX at Node 11"," :math:`{U}_{x}(x,y)` ", "Analytics", "2.10-2"
    "DY at node 11"," :math:`{U}_{y}(x,y)` ", "Analytics", "2.10-2"
    "LAGS_C at node 12"," :math:`\lambda (x,y)` ", "Analytics", "2.10-2"
    "DX at Node 12"," :math:`{U}_{x}(x,y)` ", "Analytics", "2.10-2"
    "DY at node 12"," :math:`{U}_{y}(x,y)` ", "Analytics", "2.10-2"
    "LAGS_C at node 587"," :math:`\lambda (x,y)` ", "Analytics", "2.10-2"
    "DX at node 587"," :math:`{U}_{x}(x,y)` ", "Analytics", "2.10-2"
    "DY at node 587"," :math:`{U}_{y}(x,y)` ", "Analytics", "2.10-2"
    "LAGS_C at node 726"," :math:`\lambda (x,y)` ", "Analytics", "2.10-2"
    "DX at node 726"," :math:`{U}_{x}(x,y)` ", "Analytics", "2.10-2"
    "DY at node 726"," :math:`{U}_{y}(x,y)` ", "Analytics", "2.10-2"
    "LAGS_C at node 865"," :math:`\lambda (x,y)` ", "Analytics", "2.10-2"
    "DX at node 865"," :math:`{U}_{x}(x,y)` ", "Analytics", "2.10-2"
    "DY at node 865"," :math:`{U}_{y}(x,y)` ", "Analytics", "2.10-2"
    "LAGS_C at node 1004"," :math:`\lambda (x,y)` ", "Analytics", "2.10-2"
    "DX at node 1004"," :math:`{U}_{x}(x,y)` ", "Analytics", "2.10-2"
    "DY at node 1004"," :math:`{U}_{y}(x,y)` ", "Analytics", "2.10-2"


**Table** 5.3-1