How to use NASGRO formula instead of PARIS law as defined in LOI_PROPA

Heerbeek

Hi all,
Can someone help me out here to elaborate on how NASGRO formula can be used as the crack propagation law under the command LOI_PROPA instead of the Paris law that is already defined within the program.

I would like to compare the SIFs obtained by using the NASGRO formula with those that I already obtained using the Paris law.

Thank you in advance.

Heerbeek,
Osaka, Japan.