Hi,
I need your help to solve a problem of topology optimization with buckling constraint.
I have a design space, I created a 'static displacement' constraint on a node (with a 'static' loadstep) and as objective 'minimize volume'.
Now I have to add a buckling constraint. Following tutorials I created a 'buckload' load collector, with card image EIGRL, set as following:
V1 -> 0.000
ND -> 2
and a 'buckling' loadstep, type linear buckling, with following setting:
SPC
METHOD(STRUCT) -> load collector 'buckload'
STATSUB(BUCKLING) -> loadstep 'static'
Then I created a buckling response and finally a buckling constraint, with a lower limit of 30.
But when I start the optimization it says:
*** ERROR # 1813 ***
Buckling responses can only be used for free-sizing or topology optimization of shells with non-zero T0, composites with non-zero DOPTPRM TMINPLY or minimum LAMTHK/PLYTHK, or when the design properties are excluded from buckling analysis through the EXCLUDE command.
I attach my *.hm file in the zip archive if somebody wants to have a look...
Thanks for your help and best regards,
Daniel
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