Crack surface computation in PF fracture analysis.

[selarem]

Hello,
I would like to know how to compute the total crack surface in a phase field fracture analysis. This should inform on the total crack surface and its evolution during the computation. This quantity is to output in a csv file.
Regards,
Saber

[GiudGiud]

@dschwen @hugary1995

[selarem]

Solved using TotalFreeEnergy with f_name = F for the total free energy; and with f_name = fracture_energy for the total fracture energy.
Just note that :

[./elastic_energy_1]
type = MaterialRealAux
property = 'elastic_energy'
variable = elasticlocal_energy
execute_on = timestep_end
[../]

and

[./elastic_energy_2]
type = TotalFreeEnergy
variable = total_elastic_energy
interfacial_vars = 'c'
kappa_names = 'kappa_op'
execute_on = 'TIMESTEP_END'
f_name = elastic_energy
[../]

give (slight) different outputs.

41.190242813765,41.195224132079
41.18302553809,41.188742079556
41.175391675079,41.181772920692
41.167576021253,41.174590586641
41.159834429617,41.167426571582

[selarem]

The way I am doing it today is to compute total_free_energy and subscript the total_elastic_energy. However, I want to check !