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GonPer

Composite modeling Size optimization

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Hi everyone,

I m making a composite size optimization and need to use the same design variable to multiple plies.

Simplified, I need several different plies to have the same thickness and I need several plies with diferent thickness aswell.

I formulated the problem this way and create a generic relationship to each ply, using only one design variable for multiple plies. This didn't work and appeared an error.

 

I checked the dlink card but I dont know if that fits my purpose because how can I link DVs in order to have the same value?

Any ideia on how can I do this?

 

Best regards,

Gonçalo

 

 

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Hi @GonPer

 

So you have created a DV for a ply and linked this DV to other plies DV, is my understanding correct?

 

Can you share the error message or .out file?

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Hi Prakash,

Thank you for your fast answer.

The error is:

 *** ERROR # 532 ***
 Independent DESVAR -2 on DLINK 6 is also declared
 dependent on DLINK -2.

 

I created 20 DV. I have 116 plies and made the generic relationship to each ply, linking it to a DV. Each DV has multiple plies linked to it via the generic relationship.

Didn't link DV to DV, linked multiple DVPREL to a DV.

 

best regards,

Gonçalo

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Hi @GonPer

 

Yes,

 

The error message says the same DESVAR is used on two DLINKS as independent and dependent DESVAR but I am confused with the DLINK ID -2. 

 

I will check with experts and will let you know the solution soon. 

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Hi Prakash,

 

Yes I had it on. But it isn't necessary because all the 45, -45 plies are connected in the same desvar.

Another thing that did not make sense, was that the numbers on desvars and dlinks in the error were not the same as I defined.

 

So far is runing without problems.

Thank you very much, I tought that one week of work went down the toilet, but fortunetly no.

 

Best regards,

Gonçalo

 

 

 

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15 hours ago, GonPer said:

Another thing that did not make sense, was that the numbers on desvars and dlinks in the error were not the same as I defined.

 

@GonPer

 

Good to know that you are able to see some progress.. :)

 

15 hours ago, GonPer said:

Another thing that did not make sense, was that the numbers on desvars and dlinks in the error were not the same as I defined.

 

Yes, this looks like a defect which I am going to let Devs know about it so that they can sort this out ASAP!!! 

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Hi Prakash,

Thank you for your help.

Just another thing, I dont know why but the SZTOSH option, produced a .fem file that is all changed up.

Different orientations in plies, lost ply systems, different element sets in the plies. So it isn't usable.

When I used this option with simple models it worked ok, I dont know why it didn't work this way.

 

I will do it by hand, but just for information I think you should let the Devs know aswell so they can improve it.

 

Best regards,

Gonçalo

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Hi @GonPer

 

Thank you for letting us know. There was a bug in S/w using othrotropic material and our Devs are already working on it. 

 

I will keep you posted on the same if there is any update from Dev team.

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