My model is a simple 1D PBEAML element structure (BOX beam sections) assigned for linear static analysis.
I was able to assign design variables and property relationships for beam thickness 1 & 2.
Then I assigned the optimization response for all nodes and constrainted them by lower/upper bounds ±25.4 mm under the objective of minimizing mass.
With these steps, I was able to reduce the weight of the structure as well as meeting my displacement design criteria as closest as possible.
However, the issue is now the stress increased beyond the yield strength. So I went back to my model and added the optimization reponse for static stress for all properties and constrained them with lower/upper bounds -234.4 MPa and 289.6 MPa (compressive and tensile yield strength). I made sure the response and loadsteps are assigned to the optimization constrain properly. After running the optimization, I checked the results in Hyperview, but it doesn't seem like the stress part hasn't been assigned correctly.
I'm specifically looking for constrainting Element Stresses (1D) (s) - CBAR/CBEAM Axial Stress. It seems like there are other types of stress you can assign besides the static stress, such as frf stress and psd stress? Please help me.
