Plasticity Drucker - Prager Model
The yield criterion can be defined as:
where a
and k are material
constants which are assumed unchanged during the analysis, sm is the mean stress and s
is the effective stress. a
and k are functions
of two material parameters f
and c obtained
from experiments where f
is the angle of internal friction and c
is the material cohesion strength.
Drucker-Prager model can be used to simulate the behavior of granular
soil materials such as sand and gravel. In using this material model,
the following considerations should be noted:
Strains are assumed to be small.
Problems with large displacements can be handled
provided that the small strains assumption is still valid.
The use of NR
(Newton-Raphson) iterative method is recommended.
Material parameters f
and c must be
bounded in the following ranges:
For most soil mechanics problems, gravitational
acceleration can have significant effect, therefore gravitational acceleration
should be defined through the Gravity
PropertyManager.
The required inputs include the following:
The Drucker-Prager model can be used with the solid elements (draft
and high quality mesh).