Hi, I am working on topology optimization of a beam for a project and I have a problem. I am supposed to optimizate this beam so that its stiffness is highest for most of its mass removed. However when looking at the results for diffrent percentages of mass removed I realized that stiffness increases as mass decreases. How is this possible, I am looking at the stiffness value in a wrong way? I have attached the initial beam, and 10% and 90% of mass removed for example.

Looks good! That's what you want.

The stiffness is not proportional to the mass.