.. _V1.01.287:

**v1.01.287** ZZZZ287 — Basic validation of the POST_RUPTURE operator
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**Summary:**

The purpose of this test is to validate the POST_RUPTURE operator in an elementary way. This test has no physical meaning, it is essentially a computer test.

Various operations are tested:


* normalization of the curvilinear abscissa,


* calculation of the angle of bifurcation,


* calculation of the crack advance increment in fatigue with the Paris law with and without a threshold,


* calculation of the equivalent stress intensity factor,


* calculation of :math:`{(\Delta K)}_{\mathit{eq}}` used for propagation in variable amplitude,


* zeroing the negative values of the stress intensity factors :math:`{K}_{1}` and calculating the new recovery rate G using the Irwin formula.

This test contains two models:


* Modeling A considers a crack with a background.


* Model B includes a crack with two bottoms.

This documentation is deliberately brief.