Rocks
In the Rocks subnode you define the properties for modeling materials with failure criteria representative of rocks. This material model can be used together with Linear Elastic Material and Nonlinear Elastic Material. It is available with the Geomechanics Module.
The failure criterion are described in the theory section:
Rock Model
Select a Rock criterionOriginal Hoek-Brown or Generalized Hoek-Brown. The defaults are taken From material. For User defined choices, enter other values or expressions.
Original Hoek-Brown
The defaults for the Uniaxial compressive strength σc, Hoek-Brown m parameter m, and Hoek-Brown s parameter s are taken From material.
Generalized Hoek-Brown
The defaults for the Uniaxial compressive strength σc, Geological strength index GSI, Disturbance factor D, and Intact rock parameter mi are taken From material.
Tension Cut-Off
If required, select either None or Principal stress cut-off (see Tension Cut-Off).
When Principal stress cut-off is selected from the list, enter a value or expression for the Maximum tensile stress σt. Use this to constrain the rock model with an extra yield surface, which limits the maximum principal tensile stress.
Location in User Interface
Context Menus
Ribbon
Physics tab with Linear Elastic Material or Nonlinear Elastic Material node selected in the model tree: