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frzti

Topology optimization error

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Hi All

 

I am getting this error in topology optimization data check :

 

Card "WEIGHT" is not allowed for this subcase type

 

It's a 3D Solid problem with Wcomp and Volfrac, minimizing Wcomp and 0.3 Volfrac

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It's a static analysis with PSOLID elements topology optimization. I followed the steps of a youtube video, but the model is not this one. maybe more non linear geometry. But I need to know what does the error indicate

 

 

 

 

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Hi @frzti

 

How many load cases do you have in your model?

 

Could you please share the model file using the file transfer link available in my signature?

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It is one load case, static, applied to nodes on a line.what was not clear for me was the error text, what does subcase mean ?

 

I don't have the access to file to share it now

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Subcase is nothing but the load step. if you are running a simple linear static subcase it should support load weights. 

 

Can you try with only compliance?

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what do you mean by load weight ?

 

also , does compliance that I see in theory differ from weighted compliance?

 

So you mean to remove the Volfrac variable?

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Load weight is the weight factor on applied load.

 

weighted compliance applies a weight factor on loadsteps. This will change the compliance. 

 

Retain the volfrac and use compliance instead of Wcomp if you don't want to increase compliance by a factor. 

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Thank you very much. Is there any article that I can read about compliance and weighted compliance ?

 

also , why is the contact definition in optistruct so generalistic ? without allowing me to choose the contact surfaces?

 

CONTACT        1     0.3                    NORM

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Right now you can refer to help which has a little information abou compliance and weighted compliance.

 

Contact will allow you to choose contact surfaces as well. Make sure you choose CSurf as selector type. 

contact surface.PNG

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