Implementation form of the Perzyna model

[atpellet]

Hi @larsblatny,

I am trying to calibrate the MCCVisc model for some quasistatic simulation. However, I don't understand the form of your implementation of the Perzyna model and I have a hard time deducting it from the code. Could you maybe provide a more explicit meaning of perzyna_exp and perzyna_visc, or link to the reference you used to implement this law ?

[larsblatny]

Hey @JoWsky
Have a look at this paper: https://doi.org/10.5194/egusphere-2025-1157
In Section 7.4, these two parameters are $s$ (no units) and $t_{visc}$ (units seconds), respectively.
The larger $t_{visc}$, the more viscous is the material.
Hope this helps :)

[atpellet]

Thank you very much, it does help !