Topography Optimization: to little iterations

mrtimwinkler

Hello,

 

i am performing a topographie optimization of a hat-shaped beam unter 3-point-bending with HyperMesh and Optistruct.

 

My aime is to minimize the compliance beneath a certain value (objective minimize compliance, constraint compliance < 14000), without exceeding a certain mass (constraint m < 0,000553)

 

In the optimization controls i have limited the maximum number of iterations to 100 and the convergenze criterion to 0,000001.

 

When i start the optimization, optistruct only performs the inital analysis and one optimization-iteration. The compliance of this one and only optimization-iteration is lower then the inital compliance but higher then the desired compliance. Why does optistruct dont perform additional iterations?

 

Thank you very much for your help!

With kind regards

Tim Winkler

mrtimwinkler

Hello,

 

i found out that the problem was a high mesh distorsion due to the bead creation.

 

My solution was a better and coarser mesh in the design space and other bead parameters (bigger minimum bead width and a smaller bead angle).

 

Thank you for your attention

With kind regards

Tim Winkler

Adriano_Koga

are you using PARAM,CHECKEL,NO?

It helps avoiding the problem stopping due to mesh distortion, too soon.

It is also easier to go further using tria elements instead of quads, to avoid excessive warpage.