*MOHR COULOMB HARDENING

Keyword type: model definition, material

This keyword is used to define the (isotropic) hardening behavior of a Mohr-Coulomb material. The theory for this plasticity model is described in Section 6.8.11. There are no parameters for this keyword.

The temperature dependence is taken into account in a piecewise linear way based on the data at discrete temperature points. These temperature points should be identical to those used underneath the *MOHR COULOMB card. The use of a *MOHR COULOMB HARDENING card requires a *MOHR COULOMB card within the same material definition.

First line:

• *MOHR COULOMB HARDENING

Following sets of lines define the isotropic hardening curve: First line in the first set:

• Cohesion yield stress $c$.
• Equivalent plastic strain.
• Temperature.

Use as many lines in the first set as needed to define the complete hardening curve for this temperature.

Use as many sets as needed to define complete temperature dependence.

Example:

*MOHR COULOMB HARDENING
10.,0.,294.
100.,1.,294.

defines the hardening curve for a Mohr-Coulomb material for temperature T=294. The cohesion stress $c$ is 10. for zero equivalent plastic strain and 100. for an equivalent plastic strain of 1 (= 100 %). In between linear interpolation is applied. Since the definition includes values for only one temperature, they are valid for all temperatures.

Example files: mohr1, mohr2.