Thank you for responding. I think I did not articulate my problem properly.
While performing topology optimization, I am minimizing the compliance in my structure. Compliance is inverse of stiffness. When I click on SOLUTION INFORMATION tab, I check the final summary and objective is given there. I want to know, that 'objective' is inverse of stiffness or is it the strain energy density? One of your moderator answered here that it is strain energy density. Can you please clarify?