What variable name should i use to get the solid principal stress in a TFM case?

hello guys!
i want to get the solid stress in a TFM case, i searching for the right code.
am i right about the variable in the code “calc_trd_s_mod”?
Can I use the formula 35 to get the desired plastic stress?
And is this stress approximately equivalent to the stress in DEM?
please someone give me some guide!

For your first question, yes, this is the strain rate tensor.
For your second question, this is similar to that in the PIC model, not DEM. In DEM, no stress model is used as particle-particle contact is directly treated.

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thanks for your reply!
I get it.