Dear Abaqus Community,
I am using Abaqus for topology optimization, with TIE constraints between my design domain and non-design domain. However, it seems that the topology optimization results are affected by these tie constraints, resulting in a thin layer of elements consistently appearing between the design and non-design domains (i.e., where the tie constraints are). I would like to know how to eliminate this influence.
I read in the document "For highly nonlinear contact problems, the automatic stabilization technique offered by the Abaqus solver is the recommendation. This option helps automatically control rigid body motion before the contact closure restrains such motion, which can be activated by *CONTACT CONTROLS, STABILIZE command. By default, the auto-frozen option is activated in Tosca Structure, which affects regions with contact, load, and displacement boundary conditions. Hence, it is important to deactivate the Auto frozen option AUTO_FROZEN=OFF to acquire the contact regions as design domains in cases where it is required. Note, this setting can lead to solver convergence issues.”
From my understanding, I would like to set "AUTO_FROZEN=OFF," but I am unsure if my interpretation is correct. Additionally, I do not know how to apply the "AUTO_FROZEN=OFF" command. Can I modify this in the GUI interface, or do I need to change it in the .inp file or in the keywords?
I try to modify it in the keyword by adding the command "AUTO_FROZEN=OFF" to this part of the tie constraint, however, The error message is"Unknown keyword "auto_frozen=off". The keyword may be misspelled, obsolete, or invalid."
Any guidance or suggestions from the Abaqus community would be greatly appreciated. I am eager to resolve this issue and successfully complete my topology optimization study.
Thank you in advance for your time and support.
Best regards,
Huiyang
