Description
The DELETION Case Control command defines element deletion criteria for parts of the model. This command allows you to identify parts of the model that can be deleted due to excess strain, excess stress, negative element volume, etc. The DELETION command references the property identification value, PID, which appears on a property entry. Any elements referencing this PID are subject to deletion based on the criterion specified with the associated DELETION specification.
Format
DELETION, pid, type, val, numdel
Example
DELETION, 88, EFFSTRAIN, .01,10
| Option | Definition | Type | Default |
|---|---|---|---|
| pid | Property identification: The parameter pid references a property identification value, PID, which appears on a property entry. | Integer > 0 | Required |
| type | Deletion quantity: The choices for this parameter are:
NEGVOLUME – Delete element if volume becomes negative. EFFSTRAIN – Delete element if von Mises strain exceeds VALUE. EQPS – Delete element if equivalent plastic strain exceeds VALUE. PPFA – Delete element if progressive ply failure occurs in composite analysis. PRINSTRAIN – Delete element if max principal strain exceeds VALUE. BRITTLE – Delete element if brittle materials have two or more cracks form. THINNING – Delete element if the ratio of current shell thickness to original shell thickness is less than VALUE. |
Character | Required |
| val | Deletion value. Deletion occurs if the criterion exceeds this value. Value is ignored for TYPE = NEGVOLUME, BRITTLE, and PPFA. | Real ≥ 0 | 0.0 |
| numdel | Deletion interval. Once the element is deleted, the internal forces for the element are decremented to zero over numdel increments. | Integer > 0 | 10 |