For example, if shells lie on the surface of solid elements, only the free boundary of the shell
is identified as being a surface. In this case, the solid elements must be
selected with the command SF_IDENT
. The following commands might be
used to perform the identification of the surface nodes for 3D element types only
after the finite element model is read via
FEM_INPUT
:
SELECT,ETYPE,S,ETYPE,SOLID_BRICK_8
SELECT,ETYPE,A,ETYPE,SOLID_TETRA_4
SELECT,ELEM,S,ETYPE
SF_IDENT
Remarks
- In SHAPE optimization, only marked surface nodes can be defined as being
design nodes. The identification of the surface nodes can be done by
setting the command
OPTIONS
, READ_SF_IDENT = ON
already during
loading of the FE model (see FEM_INPUT
).