Angle of Internal Friction with Plastic Strain

[SKSA]

Hi there,
Please see the first photo where the cohesion can be varied with plastic strain.

Now, I wanna vary the angle of internal friction with plastic strain also. How can I do this? As CAE there is no direct option to vary the angle of internal friction. Is it possible to do with Abaqus CAE or I have to go for subroutine option. If so then do I need to write VUSDFLD?

 

[FEA way]

Same as here:

https://www.eng-tips.com/viewthread.cfm?qid=516900

- if selected material properties can have field variable dependence then (V)USDFLD is sufficient. Otherwise, you need (V)UMAT.