Fully Stressed Design Optimization

Altair Forum User

Hello,

 

I just heard that fully stressed opimization can lead to insuffcient structures or structures which will not satisfy all requirements. What is the most neagtive aspect to use this optimization criteria?

 

Thanks!

Sören

Rahul_P1

Sören,

 

I am not sure about the actual meaning of 'fully stressed optimization' , please elaborate there,

 

There is a global stress constraint that you can use while performing optimization, here are a few points about that if that is what you mean, 

 

 

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.

 

Stress constraints may not work well in a model where there is a large differential in response values between design and non-design spaces.  In these cases, it is recommended to modify the problem formulation to say, compliance based for example.