Question: When running an optimization with an objective function "Min Mass" and Stress constraing, it seems that I receive a zero density model after

Rahul_P1

Question: When running an optimization with an objective function 'Min Mass' and Stress constraing, it seems that I receive a zero density model after a few iterations. What could be the reason for this?

Rahul_P1

Answer: Apparently, you haven't defined the stress constraint (or other constraints) in your model. If you have only the min. mass objective function, the code will look for zero mass (as this is the minimum of your function). To prevent this, please update your model to contain stress constraints, as shown in this video:http://screencast.com/t/Xb51XUkwK
Of course you can adapt the stress constraint to a value of your needs

In addition, I would like to hint you to an issue in your model / Loadcase setup: It seems that there is no load carried by the back constraint. Therefore the optimization will only keep material in the stressed area as shown below. This probably means your fixations might need to be adapted to more realistic degrees of freedom.