Description
The SPCR entry defines enforced zero displacements or zero rotations on a rigid body. Time dependent enforced displacements or rotations on a rigid body must be enforced using the SPCRD entry.
Note that the SPCR option does allow you to prescribe an initial non-zero displacement. This is not recommended in general. Instantaneous, non-zero boundary conditions applied in an explicit dynamics analysis introduce very strong shocks into the model. If the magnitude of the initial displacement is large enough, the initial displacement can turn elements inside-out in the first time increment.
If grid points that belong to a rigid body have conflicting single-point constraints applied to them by an SPC entry and an SPC1 entry, this SPCR option will over-ride those values.
Format
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| SPCR | SID | PID | C |
Example
| SPCR | 2 | 32 | 346 |
| Field | Definition | Type | Default |
|---|---|---|---|
| SID | Identification number of single point constraint set. | Integer > 0 | Required |
| PID | Property identification number of the property entry that uses the MATR1 entry. | Integer > 0 | Required |
| Ci | Component number of global coordinate. (Up to six unique digits may be placed in the field with no embedded blanks.) | 1 ≤ Integers ≤ 6 | Required |
Remarks
- Single-point constraint sets must be selected in the Case Control Section (SPC = SID).
- From one to six degrees of freedom may be defined on a single entry.
- Continuations are not allowed.
- The SID on the SPCR entry references either the material identification number, MID, on a MATR1 entry or the element identification number, EID, on an RBE2 entry.
- The constraints are applied to the reference node for the rigid body.