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Jsph

topography optimization under buckling loading

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Hello All,

 

I created simple cylindrical shell with a hole at the center and i wanna make this shell stiffer by adding ribs on its surface thus i need to perform topography optimization in order to get ribs configuration and i did as you can see in attached picture. But after i added ribs(stiffeners) to base model and run it under the linear buckling loading , i came up with less critical load than i got from the model without any ribs so i am confused now how it could be possible. 

I picked objective is to minimize response which was "buckling" is there anyone knows what could be the correct objective to get correct ribs configuration? Aim is to make more stiffener structure under the linear buckling loading.

 

 

opt results for rib configuration.jpg

added ribs conf.jpg

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Hi,

 

Looks like you are minimizing the buckling mode (first buckling mode). Buckling load times applied load leads to critical load. So if your current buckling mode is 1 this means the critical load is equal to applied load and if you reduce the buckling mode (say after optimization it is 0.8) the critical load will be 80% of applied load. try to maximize the buckling modes instead. 

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