This model is used to represent the behavior of dry soils, rocks, concrete and ceramics where the cohesion and compaction behavior of the materials result in an increasing resistance to shear up to a limiting value of yield strength as the loading increases. The yield strength of these materials is highly dependent on pressure.
There are three forms available for this model; linear, stassi and piecewise.
Although the yield stress is pressure dependent in each case, the flow rule is volume independent; in other words, a Prandtl-Reuss type.
The yield stress is a linear function of pressure (the original Drucker-Prager model)
Note: This property can only be applied to solid bodies.
Table 11.4: Input Data
| Name | Symbol | Units | Notes |
|---|---|---|---|
| Yield Stress (at zero pressure) | Stress | ||
| Slope (degrees) | Θ | None | Slope in degrees |
Custom results variables available for this model:
| Name | Description | Solids | Shells | Beams |
| EFF_PL_STN | Effective Plastic Strain | Yes | No | No |
| Pressure | Material Pressure | Yes | No | No |
Note: This material property can only be applied to solid bodies.