B modeling
==============

Calculate with CALC_G and POST_K1_K2_K3 in 3D


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


.. image:: images/10000000000002EC000002429D32A376464251EB.png
    :width: 5.0354in
    :height: 3.572in


.. _RefImage_10000000000002EC000002429D32A376464251EB.png:

This modeling makes it possible to test the calculation of :math:`\mathrm{K1}` using POST_K1_K2_K3 (method of extrapolation of displacements on the lips of the crack). The operator parameter ABSC_CURV_MAXI is calculated in POST_K1_K2_K3 so as to retain 5 nodes on the extrapolation segment (:math:`\mathrm{dmax}=\mathrm{0,35}`).

Only traction loading is taken into account.


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

Number of knots: 6536

Number of meshes and type: 432 PENTA15 and 987 HEXA20

The middle nodes of the edges of the elements touching the bottom of the crack are moved to a quarter of these edges, to obtain better precision.


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


Results of CALC_G
~~~~~~~~~~~~~~~~~~~~~


.. csv-table::

    "**Identification**", "**Reference (analytical)**", ":math:`\text{\%}` **tolerance**"
    ":math:`G` local Node 49", "11.59", "3,0"
    ":math:`G` local Node 1710", "11.59", "2,0"
    ":math:`G` local Node77", "11.59", "3,0"



Results of POST_K1_K2_K3
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


.. csv-table::

    "**Identification**", "**Reference (analytical)**", ":math:`\text{\%}` **tolerance**"
    ":math:`G` Node 49", "11.586", "2"
    ":math:`G` Node 77", "11.586", "2"
    ":math:`G` Node 1710", "11.586", "2"
    ":math:`\mathit{K1}` Node 49", "1.60E+006", "1"
    ":math:`\mathit{K1}` Node 77", "1.60E+006", "1"
    ":math:`\mathit{K1}` Node 1710", "1.60E+006", "1"


Other purely computer tests of the POST_K1_K2_K3 command are also carried out.