I am working with Abaqus on modeling crustal behavior. Colleagues use Abaqus as standard in geodynamics. I have been using another one, research FEA code more flexible specially for material behavior. For this reason, I was surprised to
how abaqus is considering creep with DP criteria.
My question is why the creep with DP in abaqus is pressure-dependent ? I understand that Frictional plasticity is pressure-dependant because of the physics of frictional material behavior that is dependant on pressure, but
I am confused to read that even the creep is pressure dependant: We can have very high shearing without flowing if under high hydrostatic pressure !!! This link explains all this.
Could anyone help me in understanding the physics of this creep behavior ?