D modeling
==============


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


* Tested behavior: TVergaard.mfront. Cohesive zone law, regularized in comparison to law CZM_LIN_REG [:ref:`R7.02.11 <R7.02.11>`].

Ref: "A modified version of the Tvergaard model." "Tvergaard V., Effect of fiber debonding in a whisker reinforced metal," "Mater. Sci. Eng., 1990, vol. a125, pp 203-213"


* The normal stress-opening characteristic curve is as follows:


    .. image:: images/100002010000032c000002649401d5b4257b2 AC5 .png
        :width: 5.1646 in
        :height: 3.8543 in


    .. _refImage_100002010000032c0000032c000002649401d5b4257b2 AC5 .png:

**Blue curve: Tvergaard, green curve: CZM_LIN_REG.**


* Modeling: similar to test SSNP118E [:external:ref:`V6.03.118 <V6.03.118>`] but with a Tvergaard law. The tests are therefore non-regression.


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


.. csv-table::

    "**Identification**", "**Instants**", "**Reference**"
    ":math:`{u}_{x}` ", "1", "2.1650635257"
    ":math:`{\sigma }_{n}` ", "0.9", "1.0475348752"
    ":math:`{\sigma }_{n}` ", "1", "0.0030176971"