Topology optimization with optistruct objective minimizing compliance

mohajerb@uwindsor.ca

In topology optimization problems with objective of minimizing compliance, we minimize the compliance which means the maximum deflection is decreased in the optimized structure. Then why the stress increases?

Is the optimized structure (minimized compliance) really stiffer than the original structure? How can we justify this increase in stresses?

I don't understand how the displacement decreases, stress increases and stiffness is maximized.

Rahul_P1

have you used a stress constraint? you can do this using the topology panel itself i.e. within the dtpl card. note however 

 

It is not recommended to use the global stress constraint along with a mass/volume constraint. The constrained mass/volume may not allow the stress constraint to be satisfied.

The stress constraint definition in a topology optimization is a global constraint and does not target local stress concentrations. These areas can be addressed subsequently through size, shape, and free shape optimization or a combination thereof. Artificial stress concentrations are filtered out during topology optimization with stress constraints. These include regions around rigid connections, concentrations due to hard geometric features such as corners, etc.