ABAQUS Volume II: I–Z - Manual (Page 159)

*MOHR COULOMB
13.16 *MOHR COULOMB: Specify the Mohr-Coulomb plasticity model.
This option is used to define the yield surface and flow potential parameters for elastic-plastic materials
that use the Mohr-Coulomb plasticity model. It must be used in conjunction with the *MOHR COULOMB
HARDENING option.
Product: ABAQUS/Standard
Type: Model data
Level: Model
References:
•
“Mohr-Coulomb plasticity,” Section 18.3.3 of the ABAQUS Analysis User’s Manual
•
*MOHR COULOMB HARDENING
Optional parameters:
DEPENDENCIES
Set this parameter equal to the number of field variable dependencies included in the definition
of the material parameters other than temperature. If this parameter is omitted, it is assumed that
the material properties are constant or depend only on temperature. See “Specifying field variable
dependence” in “Material data definition,” Section 16.1.2 of the ABAQUS Analysis User’s Manual,
for more information.
DEVIATORIC ECCENTRICITY
Set this parameter equal to the flow potential eccentricity in the deviatoric plane, e. This feature
allows the shape of flow potential in the deviatoric stress space to be controlled independently of
the angle of friction. If this parameter is omitted, the deviatoric eccentricity is calculated by default
as
, where is the Mohr-Coulomb angle of friction defined on the data
lines. The range of values e can have is .
ECCENTRICITY
Set this parameter equal to the flow potential eccentricity in the meridional plane, . The meridional
eccentricity is a small positive number that defines the rate at which the flow potential approaches
its asymptote. The default is
.
Data lines to define a Mohr-Coulomb plasticity model:
First line:
1. Friction angle, , at high confining pressure in the p– plane. Give the value in degrees.
13.16–1
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