Composite Size Optimisation
Altair EmployeeHello!
I have a problem and I haven't solved it for few days already. There is a rectangular composite plate and it is necessary to optimize thickness of the each ply to reach minimum mass and acceptable stiffness. Besides the thickness of each ply must to be multiple of the certain number. But a freesize optimisation with a composite optimisation result to the laminate with plies of different forms and each ply has inconstant thickness. I tried a lot of different ways, but it didn't help. For example, increasing of MINDIM is confined by some average dimension, and inspite of defined TMANUF of plies and PLYMAN of desvar the thickness is not multiple of the number. Can anybody help me?
Best regards
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Hi, Prakash Pagadala, thank for advice!
These days I have also tried with composite size optimization, I was sure that it must help, but OptiStruct always performed analysis only and there is a message in output file:
NO DESIGN MATRIALS OR DESIGN VARIABLES – ANALYSIS ONLY
Can you say me anything about it, please?
Hi Kazak,
have you created DESVAR and referenced the same in generic relationship subpanel in size panel?
Please check this.
<?xml version="1.0" encoding="UTF-8"?>
Yes, I have just, this way helps really. Thanks!
But in my previous message I meant not size optimisation (desvar), but composite size optimisation (dcomp). It seems like a useful function for my task but unfortunately it doesn't work. All guides and tutorials don't give a suitable answer, so I will be grateful if you explain me how can I use this function.
Kazak,
could you let me know have you applied any manufacturing constraints on DCOMP?
I would like to have a look at your model. can you share the model to check why the solvers gives no design variable is available message.
Please use the dropbox link in my signature to sahre the model.
Free Size optimization is only for Composite ?
No, It can be applied to isotropic materials as well. Since the topic deals with composites, my answer is in relation to composites.
For more information on FreeSize optimization, please refer to
Practical Aspects of Structural Optimization (A Study Guide)
Available @ https://altairuniversity.com/free-ebooks-2/free-ebook-practical-aspects-of-structural-optimization-a-study-guide/
Hi Kazak,
TMANUF doesn't really have an effect in Freesize optimization.
can you try with size optimization instead and check if that gives a desired result?