SPCF

Bulk Data Entry Used to apply SPC Force at a grid point or a SET of grid points in a continuing subcase of implicit nonlinear analysis.

Attention: Valid for Implicit Analysis only

This can also be specified in LOADADD, or in the EXCITEID field (Amplitude "A") of dynamic loads in TLOAD1 and TLOAD2 Bulk Data Entries.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
SPCF SID GID/GSETID C
GSET

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
SPCF 10 101 2

Definitions

Field Contents SI Unit Example
SID Load set identification number.

(Integer > 0)
GID/GSETID GID: Grid or scalar point identification number.

(Integer > 0)

GSETID: An identification for a SET of grid points. In this case, the GSET continuation line must be specified.

Integer
Specifies an identification number for the set.
String
Specifies a user-defined string label for the set. 4

(Integer > 0 or <String>)
C Component numbers in the global coordinate system.

No default (6 ≥ Integer ≥ 0; up to six unique such digits may be placed in the field with no embedded blanks)
GSET Flag which indicates that the GID/GSETID field is identified as a SET of grid points at which the forces are applied.

Comments

  1. In an implicit analysis, the default behavior of SPC forces during subcase continuation is to linearly ramp down any non-zero SPC forces to zero. The SPCF entry can be used to retain non-zero SPC forces from a previous subcase and apply them in the current subcase. Therefore, it can only be used in an implicit nonlinear subcase that includes the CNTNLSUB command.
  2. Similar to FORCE and SPCD, the set ID of SPCF can be specified in the subcase information section either directly using the LOAD entry, or indirectly through Bulk Data Entries such as LOADADD, TLOAD1/2. It is treated as a static load or a dynamic load, respectively. Thus, the retained SPC force is output as applied load in a continuing subcase.
  3. The degree of freedom (DOF) associated with SPCF must be constrained in the previous subcase and must be free in the current subcase. The SPC force is applied in the global coordinate system of the grid, so there is no need to specify its direction.
  4. String-based labels provide easier visual identification of sets, especially when they are referenced by other cards. For more information, refer to String Label Based Input File in the Bulk Data Input File.
  5. This card is represented as a force load in HyperMesh.