The design response for stresses for topology optimization is defined
as the following:
DRESP
ID_NAME = TOPO_STRESS_DESIGN_ELEMENTS
TYPE = SIG_TOPO_MISES
DEF_TYPE = SYSTEM
EL_GROUP = <element_group>
LC_SET = <load cases>
END_
The constraint is then defined as:
CONSTRAINT
ID_NAME = STRESS_CONSTRAINT
DRESP = TOPO_STRESS_DESIGN_ELEMENTS
MAGNITUDE = ABS
LE_VALUE = <stress constraint>
END_
Notes:
-
Different optimization settings (
STRESS_DRESP_OPT = ON
)
are applied for updating the design variables (=relative densities) when
DRESP
is TYPE = SIG_TOPO_MISES
. When
the stresses are applied as design response (DRESP
)
in a topology optimization formulation the following default settings
are modified:
-
The move limit (
DENSITY_MOVE = 0.10
in OPT_PARAM
)
on the design variables is decreased from 0.25 to 0.10.
- The maximal number of optimization iterations (
ITER_MAX = 80
in STOP
) is increased from 50 to 80.
-
The default settings are overwritten by setting
STRESS_DRESP_OPT=OFF
,
for example,
OPT_PARAM
......
STRESS_DRESP_OPT = OFF
DENSITY_MOVE = 0.15
DENSITY_UPDATE = CONSERVATIVE
......
END_