Hello Hakim,
Can you check the "Objective and response constraint capability map" provided in the link below:
Apply Design Objectives and Constraints (ansys.com)
The document says that, compliance is not supported for Non-linear static structural system, when using Lattice method, Level set method or Topography method. For more details on using structural optimization, kindly refer to this link:
Optimization Analysis Overview (ansys.com)
Regards,
Nanda.
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