how to calibrate phase field parameters when coupling with crystal plasticity

[RWTHLHK]

I combined phase field fracture with crystal plasticity. But the damage results look weird. When the stress_yy is 2,8GPa, the damage value is almost 0. But I used the parameters from phase_field-fracture test/tests, the results shouldn't seem so different.

stress results:

damage results:

[GiudGiud]

Hello

These results do not look converged in the spatial resolution of the mehs.
Please use uniform refinement to see if the results imrpove

Guillaume

[RWTHLHK]

I created a finer mesh but the damage still doesn't increase:


I used default values for CP part and phase field parameters from test files. The order of parameters magnitude should be the same.

[GiudGiud]

@dewenyushu do you have insights on this?

[RWTHLHK]

i found the reason. In material computeCrackedStress, only 2 strain types are supported: mechanical_strain and elastic_strain. But for CP model, the strain is named as total_lagranrian_strain. So the strain computeCrackedStress is always 0.