The tensile pressure failure model allows a maximum hydrodynamic tensile limit to be specified. This is used to represent a dynamic spall (or cavitation) strength of the material. The algorithm simply limits the maximum tensile pressure in the material as
If the material pressure P becomes less than the defined maximum tensile pressure, failure initiation occurs. The material instantaneously fails.
If the material definition contains a damage evolution law, the user defined maximum tensile pressure is scaled down as the damage increases from 0.0 to 1.0.
Note: The property can only be applied to solid bodies.
The crack softening failure property can be combined with this property to invoke fracture energy based softening.
Table 11.20: Input Data
| Name | Symbol | Units | Notes |
|---|---|---|---|
| Maximum Tensile Pressure | Stress | User must input a negative value. Default = –1e+20 |
Custom results variables available for this model:
| Name | Description | Solids | Shells | Beams |
|---|---|---|---|---|
| PRESSURE | Pressure | Yes | No | No |
| STATUS | Material Status** | Yes | No | No |
**Material status indicators (1 = elastic, 2 = plastic, 3 = bulk failure, 4= bulk failure, 5 = failed principal direction1, 6 = failed principal direction 2, 7 = failed principal direction 3)